Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| management of plant-parasitic nematodes with a chitin-urea soil amendment and other materials. | field trials were conducted with a chitin-urea soil amendment and several other nematicides on four crop-nematode combinations: tomato-meloidogyne incognita; potato-meloidogyne chitwoodi; walnut-pratylenchus vulnus; and brussels sprouts-heterodera schachtii. significant (p </= 0.10) nematode population reductions were obtained with the chitin-urea soil amendment in the trims on potato and walnut. in the trials on brussels sprouts and on tomato, phytotoxicity occurred at rates of 1,868 and 1,093 ... | 1992 | 19283044 |
| crop rotation studies with velvetbean (mucuna deeringiana) for the management of meloidogyne spp. | results from a greenhouse experiment at cabrils, spain, with two velvetbean (mucuna deeringiana) accessions (florida and mozambique) growing in sterilized sandy loam and inoculated with meloidogyne arenaria race 2, m. incognita race 1, and m. javanica revealed that the legume was not a host for these nematodes. in contrast, roots of 'clemson spineless' okra (hibiscus esculentum), 'summer crookneck' squash (cucurbita pepo), and 'davis' soybean (glycine max) were galled by all three root-knot nema ... | 1992 | 19283043 |
| nematode numbers and crop yield in a fenamiphos-treated sweet corn-sweet potato-vetch cropping system. | nematode population densities and yield of sweet corn and sweet potato as affected by the nematicide fenamiphos, in a sweet corn-sweet potato-vetch cropping system, were determined in a 5-year test (1981-85). sweet potato was the best host of meloidogyne incognita of these three crops. fenamiphos 15g (6.7 kg a.i./ha) incorporated broadcast in the top 15 cm of the soil layer before planting of each crop increased (p </= 0.05) yields of sweet corn in 1981 and 1982 and sweet potato number 1 grade i ... | 1992 | 19283032 |
| effect of temperature on attachment, development, and interactions of pasteuria penetrans on meloidogyne incognita. | the effect of temperature (10, 20, 25, 30, and 35 c) on attachment and development of pasteuria penetrans on meloidogyne arenaria race 1 was elevated in growth chambers. the greatest attachment rate of endospores of p. penetrans occurred on second-stage juveniles at 30 c. the bacterium developed more quickly within its host at 30 and 35 c than at 25 c or below. the development of the bacterium within the nematode female was divided into nine recognizable life stages, which ranged from early vege ... | 1992 | 19283029 |
| comparison of reproduction by meloidogyne graminicola and m. incognita on trifolium species. | the reproductive potential of meloidogyne graminicola was compared with that of m. incognita on trifolium species in greenhouse studies. twenty-five trifolium plant introductions, cultivars, or populations representing 23 species were evaluated for nematode reproduction and root galling 45 days after inoculation with 3,000 eggs of m. graminicola or m. incognita. root galling and egg production by the two root-knot nematode species was similar on most of the trifolium species. in a separate study ... | 1992 | 19282992 |
| evaluation of nicotiana otophora as a source of resistance to meloidogyne incognita race 4 for tobacco. | no currently available tobacco cultivar possesses resistance to meloidogyne incognita race 4, nor has any source of resistance been reported within nicotiana tabacum. the purpose of this study was to evaluate n. otophora acc. la quinta as a source of resistance to this pathogen. plants of tobacco cvs. nc 95 and nc 2326, n. otophora la quinta and n. repanda were inoculated with second-stage juveniles of m. incognita race 4. gall indices and egg-mass ratings were assessed at 4 and 8 weeks after in ... | 1992 | 19282991 |
| sensitivity of bedding plants to southern root-knot nematode, meloidogyne incognita race 3. | thirty-two cultivars of 10 commonly-grown bedding plants, representing eight families, were evaluated for their response to infection by the root-knot nematode, meloidogyne incognita race 3, under greenhouse conditions. four ageratum cultivars, two marigold, and two salvia cultivars were rated resistant after exposure for 8 weeks. four begonia, four celosia, one dianthus, one verbena, one vinca, and three pansy cultivars were susceptible. three salvia, one begonia, one gerber, one verbena, and t ... | 1994 | 19279964 |
| response of some common annual bedding plants to three species of meloidogyne. | twelve ornamental bedding plant cultivars were grown in soil infested with isolates of meloidogyne incognita race 1, m. javanica, or m. arenaria race 1 in a series of tests in containers in a growth room. root galling (0-5 scale) and eggs/plant were evaluated 8-10 weeks after soil infestation and seedling transplantation. snapdragon, antirrhinum majus cv. first ladies, was extensively galled and highly susceptible (mean gall rating >/=4.2 and >/=14,500 eggs/plant), and celosia argentea cv. centu ... | 1994 | 19279963 |
| raphanus sativus, sinapis alba, and fagopyrum esculentum as hosts to meloidogyne incognita, meloidogyne javanica, and plasmodiophora brassicae. | cultivars of oilseed radish (raphanus sativus var. oleifera cv. adagio, nemex, pegletta, renova, siletina, siletta nova, and ultimo), white mustard (sinapis alba cv. albatross, emergo, maxi, martigena, metex, and serval), buckwheat (fagopyrum esculentum cv. prego, tardo), and phacelia (phacelia tanacetifolia cv. angelia) were tested for susceptibility to meloidogyne incognita race 3 and meloidogyne javanica. experiments were conducted in growth chambers at 25 c and 16 hours light for 42 days aft ... | 1994 | 19279960 |
| reproduction of meloidogyne incognito and m. arenaria on tropical corn hybrids. | reproduction ofmeloidogyne incognita and m. arenaria was determined on 25 commercial tropical corn hybrids in greenhouse studies. soil around corn seedlings was infested with 3,000 eggs/plant. reproduction was quantified from counts of egg masses on roots stained with phloxine b 60 days after soil infestation. all of the tropical hybrids were susceptible to m. incognita and m. arenaria. egg mass indices (0-5 scale) ranged from 3.4 to 4.2 and from 3.4 to 4.1 for m. incognita and m. arenaria, resp ... | 1994 | 19279959 |
| host response of ornamental palms to rotylenchulus reniformis. | the responses of 20 species of ornamental palms and one cycad (cycas revoluta) to two populations of the reniform nematode, rotylenchulus reniformis, from southern florida were studied in two greenhouse experiments conducted in 1989-1991 and 1991-92. ornamental palms in pots were exposed to initial population densities of 400 and 1,500 r. reniformis/l00 cm(3) soil for 16 and 15 months, respectively. nematode reproduction occurred on acoelorrhaphe wrightii and washingtonia robusta, but not on the ... | 1994 | 19279956 |
| survey of meloidogyne spp. in tomato production fields of baix llobregat county, spain. | a survey was conducted to determine the frequency and abundance of meloidogyne spp. in tomato production sites located in baix llobregat county, barcelona, spain. forty-five sites were sampled before planting and at harvest from february to october, 1991. meloidogyne spp. occurred in 49% of the sites sampled. preplant population densities ranged from 10 to 220 (x = 110)juveniles/ 250 cm(3) soil, and final population densities ranged from 20 to 1,530 (x = 410)juveniles/250 cm(3) soil. final popul ... | 1994 | 19279955 |
| efficacy of fenamiphos formulations applied through irrigation for control of meloidogyne incognita on squash. | management ofmeloidogyne incognita by chemigation with fenamiphos was studied in an infested field planted to m. incognita-suscepfible yellow summer squash cv. dixie hybrid. fenamiphos (vl 73.1% a.i. manufacturing concentrate in propylene glycol) was mixed with unitol dsr-90 or used as fenamiphos 3 sc (spray concentrate). both formulations, applied with 63.5 kl irrigation water per hectare, decreased numbers of m. incognita second-stage juveniles in the soil and root-gall indices, and increased ... | 1994 | 19279950 |
| efficacy and compatibility for fenamiphos and eptc applied in irrigation water for nematode and weed control in snapbean production. | a nematicide (fenamiphos) and a herbicide (eptc) were injected into a sprinkler irrigation system separately and as tank mixtures and applied in 25.4 kl water/ha for nematode and weed control on snapbean. there were no differences (p = 0.05) between methods of injection of fenamiphos + eptc on efficacy or crop response. the root-gall indices of cultivars eagle and gv 50 were lower in fenamiphos-treated plots than those treated with eptc alone and untreated plots. the yield and crop value were gr ... | 1994 | 19279949 |
| influence of 1,3-dichloropropene, fenamiphos, and carbofuran on meloidogyne incognita populations and yield of chile peppers. | field trials were conducted during 1986, 1988, 1989, and 1991 to compare the effects of 1,3-dichloropropene, fenamiphos, and carbofuran on yield and quality of chile peppers (capsicum annuum) in soil infested with meloidogyne incognita. when compared with untreated plots, numbers of m. incognita juveniles recovered from soil 60 and(or) 90 days after chile pepper emergence were reduced (p = 0.05) following 1,3-d treatment every year except 1986. nematode numbers were also reduced (p = 0.05) by fe ... | 1994 | 19279948 |
| effect of tillage and crop residue management on nematode densities on corn. | effects of winter cover crop management on nematode densities associated with a subsequent corn (zea mays) crop were examined in five sites in north florida. two sites had received winter cover crops of lupine (lupinus angustifolius), and one site each had rye (secale cereale), hairy vetch (vicia villosa), and crimson clover (trifolium incarnatum). in each site, five different management regimes were compared: 1) conventional tillage after the cover crop was removed for forage; 2) conventional t ... | 1994 | 19279946 |
| reaction of ten cultivars of watermelon (citrullus lanatus) to a puerto rican population of meloidogyne incognita. | ten cultivars of watermelon were evaluated for their response to a puerto rican population of meloidogyne incognita under greenhouse conditions in a 2-year study (1989 and 1990). ten-day-old seedlings were planted in steam-sterilized soil in 15-cm-d plastic pots. the nematode inoculum consisted of 10,000 eggs and (or) second-stage juveniles (j2)/plant. the cultivars were sugar baby, charleston gray, seedless, prince charles, charleston 76, jubilee, florida giant, royal charleston, royal sweet, a ... | 1994 | 19279940 |
| response of meloidogyne spp. to pasteuria penetrans, fungi, and cultural practices in tobacco. | the response of a mixed population of meloidogyne incognita and m. javanica to three cultural practices, tobacco cultivars (two cultivars, differing in resistance to m. incognita), cover treatments (three treatments), and inorganic nitrogen fertilizer (two treatments), pasteuria penetrans, and soil-borne fungi was investigated in a tobacco field in 1991. on all sampling dates, higher densities of root-knot nematodes were observed on tobacco cv. coker 371 gold than on k-326. initially, forage sor ... | 1994 | 19279937 |
| optimal levels of meloidogyne incognita inoculum for infection of tomato and peach in vitro. | penetration of second-stage juveniles (j2) of meloidogyne incognita into tomato root explants and in vitro propagated peach plantlet roots were compared. five inoculum levels were used: 25, 50, 75, 100, and 200 j2 for tomato; and 50, 100, 200, 500, and 1,000j2 for peach. the greatest root penetration into tomato was 30% at the 75 j2 level, but the maximum penetration into peach roots was only 8% at the 200 j2 level. the difference (p = 0.05) in penetration of m. incognita at all inoculum levels ... | 1994 | 19279926 |
| interaction between meloidogyne incognita and fusarium oxysporum f. sp. phaseoli on selected bean genotypes. | four bean genotypes (ipa-1, a-107, a-211, and calima), representing all possible combinations of resistance and susceptibility to fusarium oxysporum f. sp. phaseoli (fop) and meloidogyne incognita, were each inoculated with three population densities of these pathogens. calima and a-107 were resistant to fop; a-107 and a-211 were resistant to m. incognita; and ipa-1 was susceptible to both pathogens. in fop-susceptible lines (ipa-1 and a-211), the presence of m. incognita contributed to an earli ... | 1994 | 19279917 |
| partial characterization of cytosolic superoxide dismutase activity in the interaction of meloidogyne incognita with two cultivars of glycine max. | the closely related soybean (glycine max) cultivars centennial and pickett 71 were confirmed to be resistant and susceptible, respectively, to the root-knot nematode meloidogryne incognita. increases in superoxide dismutase (sod) activity were detected in roots of both soybean cultivars 48 hours following inoculation. superoxide dismutase activity increased in roots of the susceptible cultivar overall, but declined after 96 hours in roots of the resistant cultivar. the isoelectric points of sod ... | 1994 | 19279911 |
| low-temperature scanning electron microscope observations of the meloidogyne incognita egg mass: the gelatinous matrix and embryo development. | the root-knot nematode meloidogyne incognita was cultured monoxenically on excised tomato roots. galls and egg masses were observed daily using a light microscope. two phases were distinguished in the gelatinous matrix of the egg mass: a translucent, amorphous material on the surface of the egg mass and a denser, layered phase in which nematode eggs were deposited. egg masses were also cryofixed, fractured, and observed as frozen, hydrated specimens on a cold stage in a scanning electron microsc ... | 1994 | 19279909 |
| reproduction of virulent isolates of meloidogyne incognita on susceptible and mi-resistant tomato. | the reproductive potential of natural and laboratory-selected meloidogyne incognita isolates virulent against the tomato mi resistance gene, all derived from a single egg-mass, were compared when the nematodes were inoculated on susceptible and resistant tomato. fewer second-stage juveniles (p = 0.01) of the two virulent populations selected under laboratory conditions matured to females on the resistant tomato compared to the susceptible cultivar. in contrast, no differences were found between ... | 1994 | 19279899 |
| tropical rotation crops influence nematode densities and vegetable yields. | the effects of eight summer rotation crops on nematode densities and yields of subsequent spring vegetable crops were determined in field studies conducted in north florida from 1991 to 1993. the crop sequence was as follows: (i) rotation crops during summer 1991; (ii) cover crop of rye (secale cereale) during winter 1991-92; (iii) 'lemondrop l' squash (cucurbita pepo) during spring 1992; (iv) rotation crops during summer 1992; (v) rye during winter 1992-93; (vi) 'classic' eggplant (solanum melo ... | 1994 | 19279897 |
| monoclonal antibodies to the esophageal glands and stylet secretions of heterodera glycines. | three monodonal antibodies (mabs) that bound to secretory granules within the subventral esophageal glands of second-stage juveniles (j2) of the soybean cyst nematode (scn), heterodera glycines, were developed from intrasplenic immunizations of a mouse with homogenates of scn j2. two mabs to the secretory granules within subventral glands and one mab to granules within the dorsal esophageal gland of scn j2 were developed by intrasplenic immunizations with j2 stylet secretions. stylet secretions, ... | 1994 | 19279890 |
| penetration and development of meloidogyne incognita in roots of resistant and susceptible corn genotypes. | rates of penetration and development ofmeloidogyne incognita race 4 in roots of resistant (inbred mp307, and s4 lines derived from the open-pollinated varieties tebeau and old raccoon) and susceptible (pioneer 3110) corn genotypes were determined. seedlings grown in styrofoam containers were inoculated with 5,000 eggs of m. incognita. roots were harvested at 3-day intervals starting at 3 days after inoculation (dai) to 27 dai and stained with acid fuchsin. penetration of roots by second-stage ju ... | 1994 | 19279873 |
| movement of five nematode species through sand subjected to natural temperature gradient fluctuations. | temperature gradient fluctuations that occur naturally as a result of heating and cooling of the soil surface were reproduced within 15-cm-d, 15-cm-long acrylic tubes filled with moist sand. sunny and rainy periods during the late summer in eastern texas were simulated. five ecologically different nematode species were adapted to fluctuating temperatures for 20-36 hours at a simulated depth of 12.5 cm before being injected simultaneously into the centers of tubes at that depth. when heat waves w ... | 1994 | 19279868 |
| meloidogyne incognita and rotylenchulus reniformis and associated soil textures from some cotton production areas of texas. | the incidence of meloidogyne incognita and rotylenchulus reniformis on cotton was determined in 1989-92 from 1,089 soil samples collected from 31 counties that account for nearly 60% of the 2.2 million hectares planted to cotton in texas. meloidogyne incognita was commonly found in the southern high plains and brazos river valley regions of texas (57% and 34%, respectively, of samples) but was found in less than 8% of samples from the central blacklands, coastal bend, low plains, or the upper gu ... | 1993 | 19279860 |
| response of trifolium repens clones to infection by meloidogyne incognita and peanut stunt virus. | the responses of selected clones of white clover (trifolium repens) to simultaneous infection by the southern root-knot nematode (meloidogyne incognita) and peanut stunt virus (psv) were determined. two white clover clones, which were resistant (nc-r) or sensitive (nc-s) to ozone injury, were evaluated. plant growth and m. incognita reproduction were measured. root, stolon, and top growth were reduced by psv infection, which affected nc-r more than nc-s. both clones were tolerant of m. incognita ... | 1993 | 19279855 |
| reproduction of plant-parasitic nematodes on winter rapeseed (brassica napus ssp. oleiferas). | the reproduction of isolates of five plant-parasitic nematode species on the winter rapeseed cultivars bridger, gorzanski, h-47, lindora, and viking was evaluated. each cultivar was a good host for helicotylenchus pseudorobustus, meloidogyne hapla, and m. incognita, all rapeseed cultivars were poor hosts for pratylenchus scribneri, in comparison with a susceptible reference host. heterodera glycines females rarely developed on any cultivar, but low numbers of juveniles invaded roots and males oc ... | 1993 | 19279854 |
| host suitability of graminaceous crop cultivars for isolates of meloidogyne arenaria and m. incognita. | twenty-two graminaceous plant cultivars were evaluated in the greenhouse for host suitability for three south carolina isolates of meloidogyne arenaria race 2 (ma-r2) designated as florence, govan, and pelion, a florida isolate of m. arenaria race 1 (ma-r1), and a south carolina m. incognita race 3. host suitability was determined by calculating egg mass index (emi) reproduction factor (rf) (final egg numbers/initial egg numbers), and number of eggs per gram fresh root. corn hybrids pioneer 3147 ... | 1993 | 19279853 |
| effect of crop rotation and tillage on nematode densities in tropical corn. | effects of tillage and crop rotation on nematode densities in tropical corn (zea mays cv. pioneer x304c) were examined in a factorial experiment with two rotation crops and two tillage practices (no-till vs. conventional-till), conducted in each of three seasons (1990-1992) in north florida. the rotation treatments consisted of sorghum (sorghum bicolor cv. dekalb br64) or soybean (glycine max) grown during the 1989 season. densities of meloidogyne incognita (race 1) remained lower throughout the ... | 1993 | 19279846 |
| reduction of phytoparasitic nematodes on tomato by soil solarization and genotype. | the effects of soil solarization and tomato (lycopersicon esculentum) genotype on populations of plant-parasitic nematodes and bacterial wilt were examined in north florida. maximum soil temperatures achieved under solarization treatments using a photoselective polyethylene mulch were 49.5, 46, and 40.5 c at depths of 5, 15, and 25 cm, respectively. soil solarization reduced (p < 0.05) populations of paratrichodorus minor, rotylenchulus reniformis, and criconemella spp. 85 days after transplanti ... | 1993 | 19279843 |
| colonization of greenhouse nematode cultures by nematophagous mites and fungi. | unproductive > 7-year-old greenhouse cultures of citrus nematode (tylenchulus semipenetrans) had a well-developed soil invertebrate fauna that included nematophagous mite species characteristic of florida citrus groves. nematophagous mite densities in box cultures were 285 +/- 42 mites/liter, 2.5 to 25 times higher than densities in citrus nematode-infested groves. vigorous root-knot nematode (meloidogyne incognita) cultures grown in steam-pasteurized soil had few nematophagous mites until more ... | 1993 | 19279841 |
| effects of 1,3-dicliloropropene for meloidogyne incognita management on cotton produced under furrow irrigation. | field trials were conducted during 1990 to evaluate the effects of preplant soil fumigation with 1,3-dichloropropene (1,3-d) on yield and fiber quality of furrow-irrigated cotton cultivars subjected to high population densities of meloidogyne incognita. we measured the responses of eight upland cotton cultivars with different levels of root-knot nematode resistance and compared the responses of upland and pima cottons. reductions in lint weight ranged from 10 to 52% among cultivars grown in soil ... | 1993 | 19279835 |
| differential sensitivity of meloidogyne spp. and heterodera glycines to selected nematicides. | differential sensitivity of meloidogyne arenaria, m. hapla, m. incognita, m. javanica, and heterodera glycines races 1 and 5 to the nonfumigant nematicides aldicarb, ethoprop, and fenamiphos was evaluated using a 48-hour root-penetration bioassay. generally, h. glycines was more tolerant of the nematicides, especially ethoprop, than were the meloidogyne species. among meloidogyne species, m. incognita was most sensitive to aldicarb and fenamiphos, but its reaction to ethoprop was similar to the ... | 1993 | 19279834 |
| spatial and temporal interactions of meloidogyne incognita and soybean. | the spatial and temporal dynamics of meloidogyne incognita, relative to soybean shoot and root growth in field microplots, were determined at 11 sampling dates during a growing season. the population dynamics of m. incognita on soybean were dependent on initial population (pi), soil moisture, and root spatial distribution. final egg and juvenile population densities were greatest in plots with higher pi. the population densities of juveniles and eggs were highest from mid- to late-season and wer ... | 1993 | 19279833 |
| dynamics of concomitant populations of meloidogyne incognita and criconemella xenoplax on peach. | the interaction between meloidogyne incognita and criconemella xenoplax on nematode reproduction and growth of lovell peach was studied in field microlots and the greenhouse. meloidogyne incognita suppressed reproduction of c. xenoplax in both field and greenhouse experiments. tree growth, as measured by trunk diameter, was reduced (p </= 0.05) in the presence of m. incognita as compared with c. xenoplax of the uninoculated control trees 26 months following inoculation. a similar response regard ... | 1993 | 19279823 |
| mitochondrial dna sequence divergence among meloidogyne incognita, romanomermis culicivorax, ascaris suum, and caenorhabditis elegans. | mitochondrial dna sequences were obtained from the nadh dehydrogenase subunit 3 (nd3), large rrna, and cytochrome b genes from meloidogyne incognita and romanomermis culicivorax. both species show considerable genetic distance within these same genes when compared with caenorhabditis elegans or ascaris suum, two species previously analyzed. caenorhabditis, ascaris, and meloidogyne were selected as representatives of three subclasses in the nematode class secernentea: rhabditia, spiruria, and dip ... | 1993 | 19279810 |
| response of peach scion cultivars and rootstocks to meloidogyne incognitain vitro and in microplots. | the response of the peach scion cultivars, jerseyqueen, redhaven, compact redhaven, and rio oso gem and rootstocks 'lovely and 'nemaguard' to inoculation with meloidogyne incognita was compared in vitro and in microplots. one or more parameters monitored in vitro correlated with at least one parameter monitored in microplots, 4 years after tree planting (1989). a range of responses was observed from highlysusceptible in lovell to resistant in nemaguard. in vitro and microplot data suggest high a ... | 1993 | 19279797 |
| population dynamics of plant-parasitic nematodes on cover crops of corn and sorghum. | buildup of plant-parasitic nematode populations on corn (zea mays), soybean (glycine max), and sorghum (sorghum bicolor) were compared in 1991 and 1992. final population densities (pf) of meloidogyne incognita were lower following sorghum than after soybean in both seasons, and pf after sorghum was lower than pf after corn in 1992. in both seasons, pf differed among the sorghum cultivars used. no differences in pf on corn, sorghum, and soybean were observed for criconemella spp. (a mixture of c. ... | 1993 | 19279793 |
| dynamics of the nuclear complement of giant cells induced by meloidogyne incognita. | the total numbers of nuclei in giant cells induced by meloidogyne incognita in pea, lettuce, tomato, and broad bean were determined. mature giant cells from pea had the most nuclei per giant cell with a mean of 59 +/- 23, lettuce had the fewest with 26 +/- 16, and tomato and broad bean were intermediate. the rate of increase in numbers of nuclei for all plant species was greatest during the first 7 days after inoculation. no mitotic activity was observed in giant cells associated with adult nema ... | 1993 | 19279788 |
| energetics of meloidogyne incognita on resistant and susceptible alyceclover genotypes. | to determine the energy cost of a population of meloidogyne incognita on the roots of alyceclover, nematode biomass was estimated and equations in the literature were used to calculate energy budgets. amounts of energy consumed, respired, or used in production of nematode biomass were calculated. results suggested that severe infestations of root-knot nematodes can remove significant quantities of energy from their hosts. over a 36-day period, a population of 2.6 females of m. incognita per root ... | 1993 | 19279766 |
| characterization of anionic peroxidases in tomato isolines infected by meloidogyne incognita. | changes in peroxidase activity during nematode infection were studied using root extracts of tomato near-isogenic lines differing in resistance to meloidogyne incognita. total peroxidase activity increased slightly in crude extracts of four susceptible isolines but doubled in two resistant lines, monita and motaci. nematode infection enhanced levels of both p-phenylenediamine-pyrocatechol oxidase and syringaldazine oxidase 7 days after inoculation, especially in resistant lines. this elevated pe ... | 1993 | 19279765 |
| recovery and longevity of egg masses of meloidogyne incognita during simulated winter survival. | effects of soil matrix potential on longevity of egg masses of meloidogyne incognita were determined during simulated winter conditions. egg masses were recovered from isolated root fragments incubated in field soil at matrix potentials of -0.1, -0.3, -1.0, and -4.0 bars throughout winter survival periods of 10 weeks for tomato roots and 12 weeks for cotton roots. egg masses were more superficial on cotton roots than on tomato roots and were more easily dislodged from cotton roots during recover ... | 1993 | 19279764 |
| an in vitro test for temperature sensitivity and resistance to meloidogyne incognita in tomato. | an in vitro root explant tissue culture technique is described for determining susceptibility of tomato (lycopersicon esculentum mill.) breeding lines and cultivars to the root-knot nematode meloidogyne incognita. root explants were taken from 2-day-old seedlings cultured for 30 days at 28 c on gamborg's b-5 medium with or without nematode inoculum. the remaining portion of the root and stem from the excised root explants was transferred to soil in pots and grown to maturity in the greenhouse. i ... | 1993 | 19279747 |
| use of nematodes as biomonitors of nonfumigant nematicide movement through field soil. | three field experiments were established in a loamy sand soil in the coastal plain of north carolina to determine downward movement of aldicarb and fenamiphos with a nematode bioassay. penetration of bioassay plant roots by meloidogyne incognita was measured at 1, 3, 7, 14, 21, and 28 days after treatment in the greenhouse as a means of determining nematicide effectiveness. chemical movement was similar in planted and fallow soil. nematicidal activity was greater in soil collected from the 0 to ... | 1993 | 19279744 |
| population development of meloidogyne incognita on soybean defoliated by pseudoplusia includens. | greenhouse studies examined population densities of meloidogyne incognita race 4 on soybean (glycine max 'davis') defoliated by larvae of soybean looper (pseudoplusia indudens (walker)). plants were defoliated over a 2-week period beginning 5 weeks after seedlings were transplanted. four groups of plants were infested with nematodes (5,000 eggs/pot) at 2-week intervals to allow harvesting of plants at 0, 2, 4, and 6 weeks postdefoliation (wpd). plants in each group were harvested 4 weeks after n ... | 1993 | 19279741 |
| a polymerase chain reaction method for identification of five major meloidogyne species. | a polymerase chain reaction (pcr) method for discriminating meloidogyne incognita, m. arenaria, m. javanica, m. hapla, and m. chitwoodi was developed. single juveniles were ruptured in a drop of water and added directly to a pcr reaction mixture in a microcentrifuge tube. primer annealing sites were located in the 3' portion of the mitochondrial gene coding for cytochrome oxidase subunit ii and in the 16s rrna gene. following pcr amplification, fragments of three sizes were detected. the m. inco ... | 1993 | 19279734 |
| suppression of meloidogyne incognita and m. javanica by pasteuria penetrans in field soil. | the role of pasteuria penetrans in suppressing numbers of root-knot nematodes was investigated in a 7-year monocuhure of tobacco in a field naturally infested with a mixed population of meloidogyne incognita race 1 and m. javanica. the suppressiveness of the soil was tested using four treatments: autoclaving (ac), microwaving (mw), air drying (dr), and untreated. the treated soil bioassays consisted of tobacco cv. northrup king 326 (resistant to m. incognita but susceptible to m. javanica) and c ... | 1996 | 19277344 |
| reproduction of meloidogyne arenaria, m. incognita, and m. javanica on sesame. | reproduction of meloidogyne arenaria race 1, m. ineognita races 1 and 3, and m. javanica on 10 cultivars of sesame (sesame indicum) was examined in greenhouse tests. sesame cultivars were also evaluated in a field infested with m. arenaria. sesame was a poor host for m. incognita races 1 and 3 as no sesame genotype supported more than 70 eggs/g root. reproduction of m. arenaria race 1 on sesame varied from 20 eggs/g roots for cultivar sesaco 7cb to 1,570 eggs/g roots for sesaco 119 in the greenh ... | 1995 | 19277331 |
| effects of irrigation, nitrogen, and a nematicide on pearl millet. | pearl millet is used mainly as a temporary forage crop in the southern united states. a new pearl millet hybrid has potential as a major grain crop in the united states. the effects of nematodes, irrigation, a nematicide, and nitrogen rates on a new pearl millet grain hybrid, hgm-100, and nematode population changes were determined in a 2-year study. root-knot nematodes (meloidogyne incognita race 1) entered the roots of pearl millet and caused minimal galling, but produced large numbers of eggs ... | 1995 | 19277324 |
| effects and carry-over benefits of nematicides in soil planted to a sweet corn-squash-vetch cropping system. | the effects of irrigation on the efficacy of nematicides on meloidogyne incognita race 1 population densities, yield of sweet corn, and the carry-over of nematicidal effect in the squash crop were determined in a sweet corn-squash-vetch cropping system for 3 years. fenamiphos 15g and aldicarb 15g were applied at 6.7 kg a.i./ha and incorporated 15 cm deep with a tractor-mounted rototiller. ethylene dibromide (edb) was injected at 18 kg a.i./ha on each side of the sweet corn rows (total 36 kg a.i. ... | 1995 | 19277323 |
| effect of simulated rainfall on leaching and efficacy of fenamiphos. | there is increasing concern in the united states about the pesticide movement in soil, groundwater contamination, and pesticide residue in food. the objective of this study was to determine the efficacy, degradation, and movement of fenamiphos (nemacur 15g) in the soil and residues in squash fruit as influenced by four simulated rainfall treatments (2.5 or 5.0 cm each applied 1 or 3 days after nematicide application) under field conditions. in 1990, concentrations of fenamiphos were greater in t ... | 1995 | 19277322 |
| responses of some common cruciferae to root-knot nematodes. | ten cultivated plants of the family cruciferae were evaluated for susceptibility to meloidogyne arenaria race 1, m. incognita races 1 and 3, and m. javanica in a series of four separate greenhouse tests. after 62-64 days, or 1,032-1,072 degree days (10 c base), several of the crops evaluated showed moderate to severe levels of galling (> 3.0 on 0-5 scale) and moderate numbers of egg masses (>2.0 on 0-5 scale) in response to each of the nematode species and races. among the plants tested, collard ... | 1995 | 19277321 |
| effect of yard waste compost on plant-parasitic nematode densities in vegetable crops. | the effects of yard-waste compost on densities of plant-parasitic nematodes were determined on four crops at two sites in north florida. separate experiments were conducted with sweet corn (zea mays), cowpea (vigna unguiculata), yellow squash (cucurbita pepo), and okra (hibiscus esculentus). in each test, the design was a randomized complete block replicated four times and involving three treatments: 269 mt/ha yard-waste compost applied to the soil surface as a mulch, 269 mt/ha compost incorpora ... | 1995 | 19277320 |
| effect of tropical rotation crops on meloidogyne incognita and other plant-parasitic nematodes. | in a field experiment conducted on sandy soil in florida during the 1993 season, rotation crops of castor (ricinus communis), velvetbean (mucuna deeringina), 'mississippi silver' cowpea (vigna unguiculata), american jointvetch (aeschynomene americana), 'dehapine 51' cotton (gossypium hirsutum), and 'sx-17' sorghum-sudangrass (sorghum bicolor x s. sudanense) were effective in maintaining low population densities (<12/100 cm(3) soil) of meloidogyne incognita race 1, whereas high population densiti ... | 1995 | 19277319 |
| influence of meloidogyne incognita on the water relations of cotton grown in microplots. | the effects of meloidogyne incognita on the growth and water relations of cotton were evaluated in a 2-year field study. microplots containing methyl bromide-fumigated fine sandy loam soil were infested with the nematode and planted to cotton (gossypium hirsutum l.). treatments included addition of nematodes alone, addition of nematodes plus the insecticide-nematicide aldicarb (1.7 kg/ha), and an untreated control. meloidogyne incognita population densities reached high levels in both treatments ... | 1995 | 19277313 |
| rotations with coastal bermudagrass and fallow for management of meloidogyne incognita and soilborne fungi on vegetable crops. | the efficacy of fallow and coastal bermudagrass (cynodon dactylon) as a rotation crop for control of root-knot nematode (meloidogyne incognita race 1) and soilborne fungi in okra (hibiscus esculentus cv. emerald), squash (cucurbita pepo cv. dixie hybrid), and sweet corn (zea mays cv. merit) was evaluated in a 3-year field trial. numbers of m. incognita in the soil and root-gall indices were greater on okra and squash than sweet corn and declined over the years on vegetable crops following fallow ... | 1995 | 19277312 |
| induced resistance to meloidogyne hapla by other meloidogyne species on tomato and pyrethrum plants. | advance inoculation of the tomato cv. celebrity or the pyrethrum clone 223 with host-incompatible meloidogyne incognita or m. javanica elicited induced resistance to host-compatible m. hapla in pot and field experiments. induced resistance increased with the length of the time between inoculations and with the population density of the induction inoculum. optimum interval before challenge inoculation, or population density of inoculum for inducing resistance, was 10 days, or 5,000 infective nema ... | 1995 | 19277310 |
| effect of ammonium ions on egg hatching and second-stage juveniles of meloidogyne incognita in axenic tomato root culture. | eggs, either dispersed or in masses, and second-stage juveniles (j2) of meloidogyne incognita were exposed to different concentrations of ammonium ions in a nutrient agar medium upon which excised tomato roots were growing. egg hatch and j2 penetration of the roots was slowed or inhibited at high (54 and 324 mg/liter) but not at low (1.5 and 9 mg/liter) concentrations of ammonium nitrate. the effect of ammonium on j2 appeared to be temporary and reversible. high potassium nitrate concentration ( ... | 1995 | 19277298 |
| root cortical cell spherical bodies associated with an induced resistance reaction in monoxenic cultures of meloidogyne incognita. | the root-knot nematode meloidogyne incognita was monoxenically cultured on excised roots of soybean cv. pickett and tomato cv. rutgers in agar media containing either 0 to 1,600 mug/ml ammonium nitrate or 0 to 100 mug/ml urea. observations with scanning and transmission electron microscopy indicated that an elevated concentration of ammonium nitrate or urea inhibited giant cell formation and suppressed nematode development in the infected soybean roots. in the tomato roots, concentrations of amm ... | 1995 | 19277295 |
| enzymes of the phenylpropanoid pathway in soybean infected with meloidogyne incognita or heterodera glycines. | transcription of genes encoding several enzymes and the activity of some of these enzymes of the phenylpropanoid pathway leading to synthesis of chemical and physical barriers for defense of plants against root pathogens was estimated in susceptible and resistant soybean infected with heterodera glycines race 3 or with meloidogyne incognita race 3. transcription of genes encoding phenylalanine ammonia lyase (pal) and the activity of this enzyme increased in resistant, but not susceptible, soybea ... | 1995 | 19277292 |
| optimal release rates for attracting meloidogyne incognita, rotylenchulus reniformis, and other nematodes to carbon dioxide in sand. | movement of vermiform stages of meloidogyne incognita, rotylenchulus reniformis, ditylenchus phyllobius, steinernema glaseri, and caenorhabditis elegans in response to carbon dioxide was studied in 40- and 72-mm-long cylinders of moist sand inside 38-mm-d acrylic tubes. meloidogyne incognita, r. reniformis, and s. glaseri were attracted to co when placed on a linear gradient of 0.2%/cm at a mean co concentration of 1.2%. when co was delivered into the sand through a syringe needle at flow rates ... | 1995 | 19277260 |
| damage potential and reproduction of meloidogyne incognita race 3 and m. arenaria race 1 on kenaf. | the effects of meloidogyne incognita race 3 and m. arenaria race 1 on growth of kenaf cv. everglades 41 was determined under greenhouse conditions. seedlings of kenaf were inoculated with initial population densities (pi) of 0, 625, 1,250, 2,500, 5,000, and 10,000 eggs/plant and placed on greenhouse benches in a randomized complete block design. plant growth and nematode reproduction were assessed 6 and 12 weeks after inoculation. growth suppression of kenaf in response to increasing pi was obse ... | 1996 | 19277193 |
| effect of yard waste compost on nematode densities and maize yield. | the effects of a yard waste compost on densities of plant-parasitic nematodes and forage yield of maize (zea mays) were determined over three seasons in two sites in north florida. in each test, the experimental design was a randomized complete block with five replications and three treatments: 269 mt/ha of a yard waste compost c:n ratio = 35:1 to 46:1) applied to the soil surface as a mulch, 269 mt/ha of compost incorporated into the soil, and an unamended control. of the nematodes found in the ... | 1996 | 19277191 |
| responses of meloidogyne arenaria and m. incognita to green manures and supplemental urea in glasshouse culture. | the recent loss of many effective nematicides has led to renewed interest in alternative methods of nematode management. greenhouse experiments were conducted to determine the effects of rapeseed and velvetbean green manures, and supplemental urea, on the root-knot nematodes meloidogyne arenaria and m. incognita. green manures were incorporated with m. arenaria-infested soil using rates totaling 200,300, and 400 mg n/kg soil. squash plants grown in this soil were evaluated using a gall index and ... | 1996 | 19277190 |
| screening of carnation cultivars for resistance to meloidogyne incognita. | a total of 33 carnation cultivars cultured in korea were screened for resistance to the southern root-knot nematode, meloidogyne incognita. carnations were tested by either inoculating with 5,000 eggs or by transplanting into a mixture of bedding medium and soil infested with an average of 435 second-stage juveniles/300 cm(3) soil. cultivars, desio, castelaro, kappa, rara, izu pink, target, and antalia were highly resistant to m. incognita. twelve cultivars were moderately resistant, and the rem ... | 1996 | 19277188 |
| mentha x piperita, mentha spicata and effects of their essential oils on meloidogyne in soil. | six peppermint (mentha x piperita) and six spearmint (m. spicata) pi accessions were inoculated with meloidogyne incognita race 3 and m. arenaria race 2, under greenhouse conditions. no galls formed on roots of any of the plants inoculated with 1,800 eggs/pot. fewer than two galls per root system formed on three pi accessions of peppermint inoculated with m. incognita at 5,400 eggs/pot. only one peppermint accession developed galls when inoculated with m. arenaria, whereas none of the spearmint ... | 1996 | 19277186 |
| greenhouse evaluation of selected soybean germplasm for resistance to north carolina populations of heterodera glycines, rotylenchulus reniformis, and meloidogyne species. | selected soybean genotypes were evaluated for resistance to north carolina populations of the soybean cyst nematode heterodera glycines, the root-knot nematodes meloidogyne incognita races 3 and 4, m. arenaria races 1 and 2, m. javanica, and the reniform nematode rotylenchulus reniformis in two greenhouse tests. populations of cyst nematode used in the first test were cultures from field samples originally classified as races 1-5, and those used in the second test included inbred cyst lines that ... | 1996 | 19277179 |
| impact of soil texture on the reproductive and damage potentials of rotylenchulus reniformis and meloidogyne incognita on cotton. | the effects of soil type and initial inoculum density (pi) on the reproductive and damage potentials of meloidogyne incognita and rotylenchulus reniformis on cotton were evaluated in microplot experiments from 1991 to 1993. the equilibrium nematode population density for r. reniformis on cotton was much greater than that of m. incognita, indicating that cotton is a better host for r. reniformis than m. incognita. reproduction of m. incognita was greater in coarse-textured soils than in fine-text ... | 1996 | 19277171 |
| early root response to meloidogyne incognita in resistant and susceptible alfalfa cultivars. | the early events of meloidogyne incognita behavior and associated host responses following root penetration were studied in resistant (cv. moapa 69) and susceptible (cv. lahontan) alfalfa. ten-day-old seedlings of alfalfa cultivars were inoculated with second-stage juveniles (j2) and harvested 12, 24, 48, and 72 hours and 7, 14, and 21 days later. both cultivars supported similar root penetration and initial j2 migration. by 72 hours after inoculation the majority of j2 were amassed inside the v ... | 1996 | 19277165 |
| role of nematodes, nematicides, and crop rotation on the productivity and quality of potato, sweet potato, peanut, and grain sorghum. | the objective of this experiment was to determine the effects of fenamiphos 15g and short-cycle potato (po)-sweet potato (sp) grown continuously and in rotation with peanut (pe)-grain sorghum (gs) on yield, crop quality, and mixed nematode population densities of meloidogyne arenaria, m. hapla, m. incognita, and mesocriconema ornatum. greater root-gall indices and damage by m. hapla and m. incognita occurred on potato than other crops. most crop yields were higher and root-gall indices lower fro ... | 1996 | 19277157 |
| effect of simulated rainfall on efficacy and leaching of two formulations of fenamiphos. | recoverable fenamiphos in the soil and residue in squash following different simulated rainfall treatments after nematicide application were determined in a 2-year study. efficacy of fenamiphos also was evaluated. fenamiphos treatments (3 sc and 15 g) were broadcast (6.7 kg a.i./ha) over plots and incorporated into the top 15 cm of soil immediately before planting 'dixie hybrid' squash. simulated rainfall treatments of 0, 2.5, and 5.0 cm water were applied 1 day after fenamiphos application. soi ... | 1996 | 19277156 |
| meloidogyne incognita infested soil amended with chicken litter. | the effects of chicken litter on meloidogyne incognita in cotton, gossypium hirsutum cv. dpl50 were determined in field microplots. litters (manure and pine-shaving bedding) from a research facility and a commercial broiler house were used. treatments consisted of 0.25%, 0.5%, and 1% litter by dry weight of soil for each kind of litter. three control treatments consisted of soil not amended with litter, with and without nematodes, and one treatment to which mineral fertilizer was added at a nitr ... | 1996 | 19277155 |
| surface coat of meloidogyne incognita. | the nematode surface coat is defined as an extracuticular component on the outermost layer of the nematode body wall, visualized only by electron microscopy. surface coat proteins of meloidogyne incognita race 3 infective juveniles were characterized by electrophoresis and western blotting of extracts from radioiodine and biotin-labeled nematodes. extraction of labeled nematodes with cetyltrimethylammonium bromide yielded a principal protein band larger than 250 kda and, with water soluble bioti ... | 1996 | 19277137 |
| image analysis of the growth of globodera pallida and meloidogyne incognita on transgenic tomato roots expressing cystatins. | an approach based on image analysis that enables rapid collection and analysis of nematode size and shape during growth is reported. this technique has been applied to assess meloidogyne incognita and globodera pallida during their development over 35 and 42 days, respectively, on transgenic tomato roots expressing the wild-type rice cystatin oc-i or an engineered variant, oc-iad86. morphometric values were established that subdivided enlarged saccate females from other life stages. analysis of ... | 1996 | 19277136 |
| repulsion of meloidogyne incognita by alginate pellets containing hyphae of monacrosporium cionopagum, m. ellipsosporum, or hirsutella rhossiliensis. | the responses of second-stage juveniles (j2) of meloidogyne incognita race 3 to calcium alginate pellets containing hyphae of the nematophagous fungi monacrosporiura cionopagum, m. ellipsosporum, and hirsutella rhossiliensis were examined using cylinders (38-mm-diam., 40 or 72 mm long) of sand (94% <250-mum particle size). sand was wetted with a synthetic soil solution (10% moisture, 0.06 bar water potential). a layer of 10 or 20 pellets was placed 4 or 20 mm from one end of the cylinder. after ... | 1996 | 19277129 |
| resistance to meloidogyne incognita race 3 and rotylenchulus reniformis in wild accessions of gossypium hirsutum and g. barbadense from mexico. | forty-six accessions of g. hirsutum and two of g. barbadense were examined for resistance to meloidogyne incognita race 3 and rotylenchulus reniformis in environmental growth chamber experiments, with the objective of finding new sources of resistance. only the g. barbadense accessions, tx-1347 and tx-1348, supported significantly less reproduction by r. reniformis than the susceptible control, deltapine 16 (usda accession sa-1186). however, they were highly susceptible to m. incognita race 3. t ... | 1997 | 19274280 |
| response of meloidogyne spp., heterodera glycines, and radopholus similis to tannic acid. | tannins, which are water-soluble polyphenols, are toxic to numerous fungi, bacteria, and yeasts. our objectives were to study the efficacy of tannic acid in control of meloidogyne arenaria on tomato and its effects on the behavior of m. arenaria, m. incognita, heterodera glycines, and radopholus similis. three concentrations of tannic acid, 0.1, 1.0, and 10 g/500 cm(3) of soil, were applied preplant (powder) and at-plant (powder and drench) into soil infested with m. arenaria. tannic acid at the ... | 1997 | 19274278 |
| effect of compost and maize cultivars on plant-parasitic nematodes. | effects of yard waste compost and maize (zea mays) cultivar on population densities of plant-parasitic nematodes were examined in four experiments in north florida. in one experiment, eight maize cultivars were evaluated; the other three experiments involved split-plot designs with compost treatments as main plots and maize cultivars as subplots. the three compost treatments used in these experiments were: 269 mt/ha of a yard-waste compost applied to the soil surface as a mulch, 269 mt/ha of com ... | 1997 | 19274277 |
| impact of meloidogyne incognita on the incidence of peach tree short life in the presence of criconemella xenoplax. | the relationship between cricenemella xenoplax alone and in combination with meloidogyne incognitaon the incidence of peach tree short life disease was studied in field microplots during 1989-96. the presence of m. incognita suppressed the population density of c. xenoplax on lovell peach. tree trunk diameter was significantly reduced in the presence of both nematode species prior to 1993. soil ph was lowest in the co-infection treatment as compared with the uninoculated control on three of the ... | 1997 | 19274276 |
| coastal bermudagrass rotation and fallow for management of nematodes and soilborne fungi on vegetable crops. | the efficacy of clean fallow, bermudagrass (cynodon dactylon) as a rotational crop, and fenamiphos for control of root-knot nematode (meloidogyne incognita race 1) and soilborne fungi in okra (hibiscus esculentus), snapbean (phaseolus vulgaris), and pepper (capsicum annuum) production was evaluated in field tests from 1993 to 1995. numbers of m. incognita in the soil and root-gall indices were greater on okra than on snapbean or pepper. application of fenamiphos at 6.7 kg a.i./ha did not suppres ... | 1997 | 19274273 |
| nematicidal activity of fatty acid esters on soybean cyst and root-knot nematodes. | researchers have indicated that the c fatty acid, pelargonic acid (nonanoic acid), has considerable nematicidal activity that could be increased by derivitization and improved emulsification. microemulsions of methyl and ethylene glycol esters of pelargonic acid developed by mycogen corporation (san diego, ca) were tested for nematicidal activity against root-knot and soybean cyst nematodes. all treamaents were compared to a deionized water control and a microemulsion "blank" (minus active ingre ... | 1997 | 19274268 |
| evaluation of 15 trifolium spp. and of medicago sativa as hosts of four meloidogyne spp. found in new zealand. | the predominant root-knot nematode in new zealand pastures is meloidogyne trifoliophila, identified until recently as m. hapla. clarification was needed on the host range of these two species on legumes found in new zealand pastures and on clover species closely related to trifolium repens. in a greenhouse test, 15 trifolium spp. and medicago sativa were inoculated with eggs of m. trifoliophila, m. hapla, m. incognita, or m. javanica. all legumes tested were hosts to some degree to each of the r ... | 1997 | 19274267 |
| responses of cotton yield and meloidogyne incognita soil populations to soil applications of aldicarb and 1,3-d in florida. | in four tests conducted in loamy-sand soils in northern florida, cotton lint yield increased and post-harvest soil populations of meloidogyne incognita were more effectively suppressed by 1,3-dichloropropene (1,3-d) than aldicarb when both nematicides were evaluated over a range of recommended rates. significant positive relationships existed between lint yield and rates of 1,3-d in three tests, whereas only one significant positive relationship occurred between lint yield and aldicarb rates. yi ... | 1998 | 19274259 |
| response of sesamum indicum and s. radiatum accessions to root-knot nematode, meloidogyne incognita. | twenty sesame indicum and four s. radiatum accessions in the usda plant introduction collection were evaluated for reaction to the root-knot nematode, meloidogyne incognita race 3, at two initial egg densities under greenhouse conditions. all sesame accessions produced considerably fewer root galls than the tomato cultivar rutgers. gall numbers varied slightly among accessions at the higher infestation density with even less variation at the lower density. egg mass indices indicated little repro ... | 1998 | 19274255 |
| host status of herbaceous perennials to meloidogyne incognita and m. arenaria. | twenty-two different herbaceous perennials were studied for their reaction to separate inoculations of meloidogyne arenaria and m. incognita under greenhouse conditions. perennial taxa that did not develop root-galls following inoculation, and therefore are considered as nonhosts of both nematode species, included species and cultivars of aethionema, fragaria, phlox, and polygonum. echinacea, monarda, and patrinia developed only a few galls. root-galls developed on species and cultivars of achil ... | 1998 | 19274254 |
| survey of heterodera glycines races and other plant-parasitic nematodes on soybean in north carolina. | a survey of soybean-production areas in the piedmont, coastal plain and tidewater regions of north carolina was conducted from 1994 to 1996. heterodera glycines was detected in 55 of 77 fields sampled in 15 counties. the host race of h. glycines was determined for 39 of the populations collected. of all populations collected, 4% were race 1, 40% race 2, 16% race 4, 7% race 5, and 4% race 9; the remaining 29% could not be accurately categorized. none of the populations evaluated had high levels o ... | 1998 | 19274248 |
| resistance to root-knot, reniform, and soybean cyst nematodes in selected soybean breeding lines. | soybean breeding lines and reported sources of nematode resistance were evaluated in repeated greenhouse tests for resistance to north carolina populations of the soybean cyst nematode heterodera glycines, reniform nematode rotylenchulus reniformis, and the root-knot nematode species meloidogyne incognita, m. arenaria, and m. arenaria. lines from the soybean breeding program in missouri that had 'hartwig' soybean as a parent were the most resistant to races 1-4 of the soybean cyst nematode and t ... | 1998 | 19274243 |
| interaction between meloidogyne incognita and thielaviopsis basicola on cotton (gossypium hirsutum). | the effects of meloidogyne incognita and thielaviopsis basicola on the growth of cotton (gossypium hirsutum) and the effects of t. basicola on m. incognita populations were evaluated in a 2-year study. microplots were infested with m. incognita, t. basicola, or a combination of m. incognita and t. basicola. uninfested plots served as controls both years. seedling survival was decreased by the m. incognita + t. basicola treatment compared to the control. meloidogyne incognita alone and m. incogni ... | 1998 | 19274234 |
| crop yields and nematode population densities in triticale-cotton and triticale-soybean rotations. | triticale cv. beagle 82, cotton cv. mcnair 235, and soybean cv. twiggs were arranged in three cropping sequences to determine the effects of fenamiphos and cropping sequence on nematode population densities and crop yields under conservation tillage for 4 years. the cropping sequences were triticale (t)-cotton (c)-t-c, t-soybean (s)-t-s, and t-c-t-s. numbers of meloidogyne incognita second-stage juveniles declined on trificale but increased on cotton and soybean each year. root-gall indices of c ... | 1998 | 19274228 |
| caenorhabditis elegans: a genetic guide to parasitic nematode biology. | the advent of parasite genome sequencing projects, as well as an increase in biology-directed gene discovery, promises to reveal genes encoding many of the key molecules required for nematode-host interactions. however, distinguishing parasitism genes from those merely required for nematode viability remains a substantial challenge. although this will ultimately require a functional test in the host or parasite, the free-living nematode caenorhabditis elegans can be exploited as a heterologous s ... | 1998 | 19274223 |
| reducing meloidogyne incognita injury to cucumber in a tomato-cucumber double-cropping system. | the effects of a root-knot nematode-resistant tomato cultivar and application of the nematicide ethoprop on root-knot nematode injury to cucumber were compared in a tomato-cucumber double-cropping system. a root-knot nematode-resistant tomato cultivar, celebrity, and a susceptible cultivar, heatwave, were grown in rotation with cucumber in 1995 and 1996. celebrity suppressed populations of meloidogyne incognita in the soil and resulted in a low root-gall rating on the subsequent cucumber crop. n ... | 1998 | 19274214 |
| peanut-cotton-rye rotations and soil chemical treatment for managing nematodes and thrips. | in the southeastern united states, a cotton-peanut rotation is attractive because of the high value and extensive planting of both crops in the region. the objective of this experiment was to determine the effects of cotton-peanut rotations, rye, and soil chemical treatments on management of plant-parasitic nematodes, thrips, and soilborne fungal diseases and on crop yield. peanut-cotton-rye rotations were conducted from 1988 to 1994 on tifton loamy sand (plinthic kandiudult) infested primarily ... | 1998 | 19274213 |
| the potential of thiarubrine c as a nematicidal agent against plant- parasitic nematodes. | thiarubrine c, a polyacetylenic 1,2-dithiin isolated from the roots of rudbeckia hirta (asteraceae), exhibited strong nematicidal activity in in vitro and growth chamber assays. thiarubrine c was toxic, in the absence of light, to the plant-parasitic nematodes meloidogyne incognita and pratylenchus penetrans at lcs of 12.4 ppm and 23.5 ppm, respectively. a minimum exposure time between 12 and 24 hours was the critical period for nematode mortality due to thiarubrine c. although thiarubrine c was ... | 1998 | 19274210 |
| pathogenicity of pratylenchus penetrans, heterodera glycines, and meloidogyne incognita on soybean genotypes. | the pathogenicity of heterodera glycines, meloidogyne incognita, and pratylenchus penetrans on h. glycines-resistant 'bryan,' tolerant-susceptible 'g88-20092,' and intolerant-susceptible 'tracy m' soybean cultivars was tested using plants grown in 800 cm(3) of soil in 15-cm-diam. clay pots in three greenhouse experiments. plants were inoculated with 0, 1,000, 3,000, or 9,000 h. glycines race 3 or m. incognita eggs, or vermiform stages of p. penetrans/pot. forty days after inoculation, nmnbers of ... | 1998 | 19274203 |
| potential of foliar, dip, and injection applications of avermectins for control of plant-parasitic nematodes. | studies were conducted to determine the potential of two avermectin compounds, abamectin and emamectin benzoate, for controlling plant-parasitic nematodes when applied by three methods: foliar spray, root dip, and pseudostem injection. experiments were conducted against meloidogyne incognita on tomato, m. javanica on banana, and radopholus similis on banana. foliar applications of both avermectins to banana and tomato were not effective for controlling any of the nematodes evaluated. root dips o ... | 1998 | 19274200 |
| degradation of fenamiphos in agricultural production soil. | nematicides are used to control a wide variety of nematodes on many crops; unfortunately, oftentimes the control they provide is erratic. this erratic behavior is not always predictable and has been associated with chemical, physical, and biological degradation of nematicides. their accelerated degradation is an agricultural problem that has been observed in crop monocultures and in other crop production systems where a biodegradable compound is repeatedly applied to the same soil. the problem c ... | 1998 | 19274197 |
| effects of monoclonal antibodies, cationized ferritin, and other organic molecules on adhesion of pasteuria penetrans endospores to meloidogyne incognita. | the incidence of adhesion of pasteuria penetrans endospores to meloidogyne incognita second-stage juveniles (j2) was studied after pretreatment of the latter with monoclonal antibodies (mab), cationized ferritin, and other organic molecules in replicated trials. monoclonal antibodies developed to a cuticular epitope of m. incognita second-stage juveniles gave significant reductions in attachment of p. penetrans endospores to treated nematodes. mab bound to the entire length of j2 except for the ... | 1997 | 19274193 |