Publications
| Title | Abstract | Year(sorted descending) Filter | PMID Filter |
|---|
| effect of aldicarb, ethoprop, and carbofuran on control of coffee root-knot nematode, meloidogyne exigua. | egg hatch of meloidogyne exigua was significantly inhibited in 14 days pretreatment with aldicarb, ethoprop, or carbofnran at concentrations higher than 0.1 mug/ml; these eggs were found to delay hatch in 19 days posttreatment in ethoprop. aldicarb and carbofuran solutions at concentrations greater than 0.1 mug/ml significantly decreased the motility and the life span of the second-stage juveniles; aldicarb was more toxic than carbofuran to the nematode. in a field test, aldicarb (temik 10g), et ... | 1983 | 19295839 |
| studies on lasioseius scapulatus, a mesostigmatid mite predaceous on nematodes. | the life history and feeding habits of lasioseius scapulatus, an ascid predator and potential biocontrol agent of nematodes, was examined. reproduction was asexual, and the life cycle was 8-10 days at room temperature. life history consisted of the egg, protonymph, deutonymph, and adult. both nymphal stages and the adult captured and consumed nematodes. two fungal genera and eight genera of nematodes were suitable food sources. second-stage root-knot nematode juveniles were eaten, but eggs and a ... | 1983 | 19295841 |
| influence of six vegetable cultivars on reproduction of meloidogyne javanica. | replicated field and greenhouse experiments were used to evaluate the effect of tomato, cabbage, cucumber, carrot, amaranthus hybridus, and pepper on growth and fecundity of meloidogyne spp., particularly m. javanica. in the field tests, tomato, cucumber, and carrot favored population increases of meloidogyne spp., while amaranthus, pepper, and cabbage limited them. some cropping sequences that included crops from the latter group had a suppressive effect on population growth. thus, of the 36 cr ... | 1983 | 19295847 |
| interrelationships between ethylene production, gall formation, and root-knot nematode development in tomato plants infected with meloidogyne javanica. | ethylene production was determined in excised tomato (lycopersicon esculentum) root cultures of meloidogyne javanica susceptible and resistant cultivars infected with m. javanica. uninfected cultivars produced very low amounts of ethylene. relatively high amounts of ethylene were produced by the infected susceptible cultivars. peak production of 1.6 n moles * g root(1) * h(1) occurred between 9 and 16 days after inoculation (dai). the period of high ethylene production coincided with that of rap ... | 1983 | 19295844 |
| meloidogyne aquatilis n. sp (nematoda:meloidogynidae) from spartina pectinata with a key to the canadian species of meloidogyne. | a new root-knot nematode, meloidogyne aquatilis n. sp., attacking the roots of spartina pectinata link growing in the ottawa river is described and illustrated. meloidogyne aquatilis is distinguished from m. graminis by the light brown body color and by the absence of perineal lateral fields in the female. the male differs by the shorter stylet and by the hemizonid being separated by 7-9 annules from the excretory pore. the second-stage juveniles are also recognized by the 7-9-annule gap between ... | 1983 | 19295816 |
| development of the false root-knot nematode, nacobbus aberrans, on sugarbeet. | the duration of the embryogenic development of nacobbus aberrans (= n. batatiformis) took 9-10 days at 25 c and 51 days at 15 c. the j molted in the egg; hence the je emerged from the egg. the effect of distilled water attd root leachates of kochia and sugarbeet was investigated at 5, 10, 15, 20, and 25 c. root leachates did not significantly affect the percent of cumulative hatch of eggs, but temperature did significantly affect emergence of juveniles (p = 0.05). less than 1, 5, and 20% of eggs ... | 1983 | 19295804 |
| effect of soil water potential on survival of meloidogyne javanica in fallow soil. | a natural infestation of meloidogyne javanica in an aggregated oxisol declined at an exponential rate when aliquots of the soil were stored for 72 days in polyethylene bags at various soil water potentials (psi). time periods required for reduction in soil infestations by 50% were 2.7, 4.9, 110, 10, and 2.6 days at psi of -0.16, -0.30, -1.1, -15, and -92 bars, respectively. in the wetter soils, at psi of -0.16, -0.30, and -1.1 bars, the predominant stage recovered was the second-stage larva. in ... | 1983 | 19295774 |
| isozyme monitoring of genetic variation in lycopersicon. | linkages with isozymic loci facilitate the investigation of certain classes of genetic variation. due to the mapping of 20 isozymic loci on nine of the 12 chromosomes of the cultivated tomato (lycopersicon esculentum), much progress has been made in these applications, particularly in the analysis of interspecific hybrids. isozymes can expedite the selective elimination of inferior wild parent germ plasm in backcross transfer of desired genes to the cultivated parent. allelic isozyme constitutio ... | 1983 | 6642990 |
| reproduction of two races of meloidogyne incognita in tomato plants grown at high temperature. | 1983 | 19295858 | |
| interaction of vesicular-arbuscular mycorrhizal fungi and phosphorus with meloidogyne incognita on tomato. | the influence of two vesicular-arbuscular mycorrhizal fungi and phosphorus (p) nutrition on penetration, development, and reproduction by meloidogyne incognita on walter tomato was studied in the greenhouse. inoculation with either gigaspora margarita or glomus mosseae 2 wk prior to nematode inoculation did not alter infection by m. incognita compared with nonmycorrhizal plants, regardless of soil p level (either 3 mug [low p] or 30 mug [high p] available p/g soil). at a given soil p level, nema ... | 1983 | 19295826 |
| influence of maize rotations on the yield of soybean grown in meloidogyne incognita infested soil. | a replicated field study was conducted from 1972 to 1980 involving soybeans grown in 2-, 3-, and 4-year rotations with maize in soil infested with meloidogyne incognita. monocultured soybeans were maintained as controls. cropping regimes involved root-knot nematode susceptible and resistant soybean cultivars and soybeans treated and not treated with nematicides. yields of susceptible cultivars declined with reduced length of rotation. nematicide treatment significantly increased yields of suscep ... | 1983 | 19295824 |
| parasitic variability of meloidogyne incognita populations on susceptible and resistant cotton. | root gall induction and egg production by the four recognized host races and two cytological races of meloidogyne incognita were compared on cotton gossypium hirsutum cvs. deltapine 16 (root-knot susceptible) and auburn 634 (highly resistant). the 12 nematode populations included in the study were from various parts of the world. no population increases occurred on the highly resistant cultivar. after 45 days, populations of host races 1 and 2 induced slight root galling on both cuhivars with on ... | 1983 | 19295806 |
| validation of a model for prediction of host damage by two nematode species. | plant roots were mechanically injured or subjected to nematode parasitism to test the model of host damage by two nematode species: y = m' + (l - m')c'z(p)z(p) for y </= 1.0 and y = 1.0 for y > 1.0, where m' = m + (m - m) (1 - y)/[(1 - y) + (l - y)] and c' = (z(-t) + z(-t))/2. damage functions for greenhouse-grown radish plants (cv. cherry belle) mechanically injured with small or large steel needles were used to predict growth of plants injured by both needles. growth predictions accounted for ... | 1983 | 19295796 |
| development of meloidogyne incognita inhibited by digtaria decumbens cv. pangola. | population densities of the root-knot nematode, meloidogyne incognita, were lower after 90 days in soil planted to digitgrass (digitaria decumbens cv. pangola) than in soil left fallow or planted to tomato. roots of tomato seedlings interplanted with pangola digitgrass were less galled than were roots of tomato seedlings planted alone. fewer second stage larvae invaded roots of pangola digitgrass than tomato and those that entered the grass roots failed to develop beyond the late second stage. | 1983 | 19295772 |
| effect of time of application on the action of foliar sprays of oxamyl on meloidogyne hapla in tomato. | foliar sprays containing 3,000 or 4,000 ppm oxamyl applied before inoculation with meloidogyne hapla completely protected tomato plants from intection for up to 36 days but sprays containing 1,000 or 2,000 ppm provided only partial protection. postinoculation sprays were less effective than preinoculation sprays but they decreased the numbers of females and their rate of development and increased the numbers of males. similar amounts of oxamyl applied to the soil as a drench or as granules contr ... | 1983 | 19295771 |
| relationship between meloidogyne hapla density and damage to carrots in organic soils. | field and growth chamber experiments were conducted to determine the effect of five initial densities (pi - 20 - 240/100 cm(3) soil) of meloidogyne hapla on carrot development and yield of storage roots at maturity. carrots growing in infested and noninfested organic soil were harvested after 15, 29, 44, 59, and 106 days of growth in controlled environment chambers and after l l 0 days in field plots. nematodes affected weight of roots and foliage, weight and length of the storage portion of tap ... | 1982 | 19295674 |
| optimum initial inoculum levels for evaluation of resistance in tomato to meloidogyne spp. at two different soil temperatures. | the effects of meloidogyne incognita or m. javanica at five initial inoculum levels of 20, 100, 200, 1,000, and 2,000 eggs and infective juveniles per seedling on 'floradade,' 'nemarex,' 'patriot,' and 'pi 129149-2(sib)-5' tomatoes maintained at 25 or 32.5 c were studied. the number of egg masses on roots of the susceptible cultivar floradade was similar for both species of root-knot nematodes at either 2.5 or 32.5 c soil temperatures. at 25 c, very low numbers of egg masses were produced by bot ... | 1982 | 19295749 |
| influence of initial population densities of meloidogyne incognita on three chile cultivars. | the effects of meloidogyne incognita on the big jim, jalapeno, and new mexico no. 6 chile (capsicum annuum) cultivars were investigated in microplots for two growing seasons. all three cultivars were susceptible to m. incognita and reacted similarly to different initial populations of this nematode. severe stunting and yield suppressions occurred at all initial m. incognita densities tested ranging from 385 to 4,230 eggs and larvae/500 cm(3) soil. regression analysis of the microplot data from a ... | 1982 | 19295720 |
| influence of soil temperature on meloidogyne incognita resistant and susceptible cotton, gossypium hirsutum. | the degree of resistance by a cotton plant to meloidogyne incognita is affected by soil temperature, particularly in moderately resistant cultivars, the total number of nematodes in the resistant and moderately resistant rools at 35 c was equal to, or greater than, the number in susceptible roots at 20, 25, or 30 c. a shift in numbers to developing and egg-bearing forms of nematodes in the susceptible cultivar as tentperature increased indicates development was affected by temperature rather tha ... | 1982 | 19295718 |
| meloidogyne cruciani n. sp. a root-knot nematode from st. croix (u.s. virgin islands) with observations on morphology of this and two other species of the genus. | meloidogyne cruciani n. sp. infecting tomato (lycopersicon esculentum mill.) in the u.s. virgin islands is described and illustrated. m. cruciani is distinguished from other species of the genus by having punctations around the anus of the female and by the second-stage juveniles possessing tri-lobed esophageal glands which are longer than most other species, with their posterier end at about 46.4% of the body length. the esophageal glands of the immature and adult females are contained in five ... | 1982 | 19295712 |
| the relationship between soil populations of meloidogyne incognita and yield reduction of soybean in the coastal plain. | in a replicated field plot experiment, the population density of meloidogyne incognita was monitored biweekly through the overwintering period (december through april) between soybean crops. the population survived as second-stage juveniles whose numbers remained stable through the winter months and did not decline until february. the yields of plots planted with a m. incognita susceptible cultivar were negatively correlated with the numbers of juveniles recovered at all preplanting sampling dat ... | 1982 | 19295691 |
| chloroplast differentiation in tomato root galls induced by the root knot nematode meloidogyne incognita. | primary roots of tomato, lycopersicon esculentum cv. marglobe, were cultured aseptically on agar containing a standard nutrient formulation with or without kinetin. when secondary roots developed, cultures were inoculated with the root-knot nematode, meloidogyne incognita. following inoculation, the cultures were divided into two groups which were incubated either in total darkness or in 16-h light-8-h dark cycles. at 24 h, 1, 2, 3, and 4 wk after incubation, roots from all cultures were process ... | 1982 | 19295678 |
| effects of management practices on meloidogyne incognita and snap bean yield. | phenamiphos applied at 6.7 kg ai/ha through a solid set or a center pivot irrigation system with 28 mm of water effectively controlled root-knot nematodes, meloidogyne incognita, and resulted in greater snap bean growth and yields irrespective of growing season, tillage method, or cover crop system. the percentage yield increases attributed to this method of m. incognita control over nontreated controls were 45% in the spring crop, and 90% and 409% in the fall crops following winter rye and fall ... | 1982 | 19295676 |
| potential of tissue culture for breeding root-knot nematode resistance into vegetables. | plant protoplast technology is being investigated as a means of transferring root-knot nematode resistance factors from solanum sisymbriifolium into the susceptible s. melongena. solanum sisymbriifolium plants regenerated from callus lost resistance to meloidogyne javanica but retained resistance to m. incognita. tomato plants cloned from leaf discs of the root-knot nematode resistant 'patriot' were completely susceptible to m. incognita, while sections of stems and leaves rooted in sand in the ... | 1982 | 19295668 |
| influence of potassium and nitrogen fertilization on parasitism by the root-knot nematode meloidogyne javanica. | the influence of various c oncentrations of k, nitrogen sources, and inoculation with root-knot nematode meloidogyne javanica were evaluated in tomato plants. increased potassium concentration increased top and root fresh weights of intact plants and fresh weights of excised roots. nitrate-fertilized plants weighed more than plants receiving ammonium independent of the k level in the medium. nematode counts on roots were not affected by nutritional differences in intact or excised roots. in inta ... | 1982 | 19295748 |
| lectin binding to meloidogyne javanica eggs. | 1982 | 19295730 | |
| post-infection development and morphology of meloidogyne cruciani. | the development and life stages of meloidogyne cruciani on tomato was studied at 28 c. roots of 2-wk-old 'rutgers' tomato seedlings were exposed to inoculum for 24 h, rinsed, and the seedlings repotted. no major changes in juvenile development were observed prior to 8 days after inoculation. at 11 days the second-stage juvenile had enlarged considerably. the genital primordium had not yet asumed the v-shape characteristic of developing females, but the presence of rectal glands identified the ju ... | 1982 | 19295716 |
| description of the blueberry root-knot nematode, meloidogyne carolinensis n. sp. | meloidogyne carolinensis n. sp. is described from cultivated highbush blueberry (cultivars derived from hybrids of vaccinium corymbosum l. and v. lamarckii camp) in north carolina. the perineal pattern of the female has a large cuticular ridge that surrounds the perivulval area, and the excretory pore is near the level of the base of the stylet. the stylet is 15.9 mum long and the knobs gradually merge with the shaft. the head shape and stylet morphology of the male are quite variable. the typic ... | 1982 | 19295713 |
| characterization of sialyl and galactosyl residues on the body wall of different plant parasitic nematodes. | the plant parasitic nematodes helicotylenchus multicinctus, meloidogyne javanica, tylenchulus semipenetrans, and xiphinema index, differing in their host specificity and parasitic habits, were analyzed as to their cuticle surface sialyl, galaclosyl, and/or n-acetylgalactosaminyl residues. the procedure involved the selective oxidation of sialic acid and galactose/n-acetylgal-actosamine residues using periodate and galactose oxidase, respectively, to form reactive aldehyde groups. these functiona ... | 1982 | 19295671 |
| meloidogyne platani n. sp. (meloidogynidae), a root-knot nematode parasitizing american sycamore. | meloidogyne platani n. sp. is described and illustrated from specimens obtained from roots of american sycamore, platanus occidentalis, in virginia. this new species shows certain similarities with m. arenaria but differs from it by a number of distinctive characters. the perineal pattern of females is rounded with fine, wavy to zig-zag striae and raised, convoluted striae in the inner lateral line regions. the stylet of females is 16.5 mum long with large, rounded stylet knobs set off from the ... | 1982 | 19295679 |
| incidence and distinguishing characteristics of meloidogyne chitwoodi and m. hapla in potato from the northwestern united states. | from september 1980 to june 1981, a survey was conducted in the major potato growing regions of northern california, idaho, nevada, oregon. and washington to determine the distribution of meloidogyne chitwoodi and other meloidogyne spp. meloidogyne chitwoodi and m. hapla were the only root-knot nematode species detected parasitizing potato in all the states surveyed. meloidogyne chitwoodi occurred alone in 83% of the samples and m. hapla in 11%, with 6% of all samples containing both species. th ... | 1982 | 19295719 |
| pathological interaction of a combination of heterodera schachtii and meloidogyne hapla on tomato. | increased culturing of a tomato population of heterodera schachtii (ut1c) on tomato for 480 days (eight inoculation periods of 60 days each) significantly increased virulence to 'stone improved' tomato. a synergistic relationship existed between meloidogyne hapla and h. schaehtii on tomato. a combination of h. schachtii (utic) and m. hapla significantly reduced tomato root weights by 65, 64, and 61% below root weights of untreated controls, and single inoculations of m. hapla and h. schachtii, r ... | 1982 | 19295694 |
| the effect of arthrobotrys conoides on meloidogyne incognita population densities in corn as influenced by temperature, fungus inoculum density, and time of fungus introduction in the soil. | in greenhouse experiments, the effect of arthrobotrys conoides on meloidogyne incognita population densities as affected by soil temperature, inoculum density, and green alfalfa was determined. the effect on m. incognita population densities was greater at a soil temperature of 25 c than at 18 or 32 c. nematode control by a. conoides was most effective when the fungus was introduced into the soil 2 wk prior to nematode inoculation and planting of corn. inoculum density of a. conoides was positiv ... | 1982 | 19295692 |
| population dynamics of meloidogyne incognita on corn grown in soil in fested with arthrobotrys conoides. | microplot and greenhouse experiments were conducted to evaluate the effects of soil incorporation of the nematophagous fungus arthrobotrys conoides and green alfalfa mulch on the population dynamics of meloidogyne incognita on corn. reproduction of m. incognita and the incidence of root galling were reduced by the addition of a. conoides and/or green alfalfa in all tests. numbers of juveniles were reduced by as much as 84%, and eggs were fewest in early to mid-season soil samples from microplots ... | 1982 | 19295673 |
| dynamics of concomitant populations of hoplolaimus columbus, scutellonema brachyurum, and meloidogyne incognita on cotton. | cotton seedlings grown in a greenhouse and a growth chamber were inoculated with scutellonema brachyurum, hoplolaimus columbus, and meloidogyne incognita, singly and in all possible combinations, at two initial population (pi) levels (100 and 300/100 cm(3)). s. brachyurum alone was not pathogenic to cotton at these population levels. it fed primarily as an ectoparasite but matured and reproduced within the root when it penetrated. populations of s. brachyurum increased in the presence of h. colu ... | 1981 | 19300720 |
| comparative studies on root invasion, root galling, and fecundity of three meloidogyne spp. on a susceptible tobacco cultivar. | root invasion, root galling, and fecundity of meloidogyne javanica, m. arenaria, and m. incognita on tobacco was compared in greenhouse and controlled environment experiments. significantly more m. javanica than m. arenaria or m. incognita larvae were found in tobacco roots at 2, 4, and 6 d after inoculation. eight days after inoculation there were significantly more m. arenaria and m. javanica than m. incognita larvae. ten days after inoculation no significant differences were found among the t ... | 1981 | 19300745 |
| pathogenicity of the columbia root-knot nematode (meloidogyne chitwoodi) on wheat, corn, oat, and barley. | 1981 | 19300804 | |
| interaction between meloidogyne arenaria and glomus fascicuqlatus in grape. | root zones of grape (fitis vinifera cv thompson seedless) cuttings were infested with chlamydospores of glomus fasciculatus or eggs of meloidogyne arenaria or both. growth of grapevines was greatest in mycorrhizal (g. fasciculatus) plants. mycorrhizal development and growth of mycorrhizal and nonmycorrhizal plants were reduced in the presence of m. arenaria. at low initial nematode inoculum (pi) levels (approx. 200 eggs/plant), the presence of mycorrhizae enhanced plant growth during 1 yr, but n ... | 1981 | 19300722 |
| nematodes associated with pawpaw (cv. homestead) in nsukka, nigeria. | in field and greenhouse experiments, meloidogyne javanica caused symptomatic damage to pawpaw (cv. homestead). other important nematodes to which pawpaw seemed a good host included pratylenchus spp., rotylenchus reniformis, helioctylenchus spp., and tylenchulus martini. pawpaw appeared as a poor host to scutellonema clatbricaudatum and hoplolaimus pararobustus. fusarium sp. was isolated from the plant roots. | 1981 | 7342958 |
| three new species of heteroderoidea (nematoda) from the aleutian islands. | three new species of heteroderoidea are described from adak and amchitka islands in the aleutian chain. second-stage juveniles of thecavermiculatus crassicrustata, n. sp., differ from those of t. gracililancea robbins by having longer stylets (40-45 mum vs 19-22 mum). the female of t. crassicrustata has a longer neck, a more posterior excretory pore, and lacks a posterior protuberance. meloidodera eurytyla, n. sp., differs from other meloidodera spp. in that second-stage juveniles have longer st ... | 1981 | 19300796 |
| diacyl, alkylacyl, and alkenylacyl phospholipids of meloidogyne javanica females. | the phospholipid composition and acyl, alkyl, and alkenyl group compositions of diacyl, alkylacyl, and alkenylacyl phosphoglycerides of m. javanica were investigated. phospholipid was comprised of 61.7% choline phosphoglyceride, 22.0% ethanolamine phosphoglyceride, and smaller quantities of six other lipids. phospholipid fatty acid was more unsaturated than neutral lipid fatty acid and contained 61.3% octadecenoic (18:1) acid. fatty acid at the 1-position of diacyl phospholipids was shorter and ... | 1981 | 19300731 |
| scanning electron microscope study of the root-knot nematode (meloidogyne incognita) on tomato root. | this study examines the types of structural information that can be gained by utilizing the scanning electron microscope (sem) and a cryofracture technique to examine the host-parasite interaction. roots of tomato, lycopersicon esculentum cv. marglobe, were cultured aseptically and inoculated with the root-knot nematode, meloidogyne incognita. twenty-four hours to four weeks after inoculation, developing galls were removed from the cultures and processed for sem observation. the cryofracture tec ... | 1981 | 19300776 |
| oogenesis and the chromosomes of the parthenogenic root-knot nematode meloidogyne incognita. | 220 populations of meloidogyne incognita and related forms from 46 countries reproduced by mitotic parthenogenesis (apomixis). determination of somatic chromosome numbers from oogonia and oocytes revealed the existence of a predominant, possibly triploid race a with 3n = 40 to 46 and a rare, diploid race b with 2n = 32 to 36 chromosomes. there is no correlation between cytological races and the four recognized host races of this species. the characteristic behavior of prophase i chromosomes of m ... | 1981 | 19300730 |
| influence of volcanic ash on infectivity and reproduction of two species of meloidogyne. | mount st. helens volcanic ash was incorporated into a loamy sand greenhouse soil mix to produce concentrations of 0, 0.5, 1.0, 2.0, 4.0, 8.0, 25, 50 and 100% ash. chemical and physical properties of the various mixtures were determined. three experiments were conducted in a greenhouse to determine if volcanic ash had any influence on root-knot nematode survival and infectivity. tomato, lycoperscion esculentum, seedlings cv. columbia, susceptible to meloidogyne hapla and m. chitwoodi were planted ... | 1981 | 19300784 |
| inhibition of syncytia formation and root-knot nematode development on cultures of excised tomato roots. | two different defined growth media were used to culture aseptically the root-knot nematode, meloidogyne incognita, on excised roots of tomato, lycopersicon esculentum cv 'marglobe.' one of these media, stw, was a formulation by skoog, tsui, and white and the other, ms, a formulation by murashige and skoog. from 1 through 4 weeks, inoculated tissues were fractured to observe root infection, giant-cell formation, and nematode development with the scanning electron microscope (sem). four weeks afte ... | 1980 | 19300696 |
| physiology of parasites: transaminases (got and gpt) in the root-knot nematode, meloidogyne lucknowica singh 1969, and effect of sex on its enzyme levels. | the glutamic-pyruvic transaminase (gpt) activity was found to be greater than the glutamicoxalacetic transaminase (got) activity in the mixed as well as in separate sexes of m. lucknowica. the sexual differences were 44.26% in got levels and 41.8% in gpt levels of the two sexes of the parasite, and the females showed higher enzymatic activity than their males. | 1980 | 7424217 |
| description and sem observations of meloidogyne chitwoodi n. sp. (meloidogynidae), a root-knot nematode on potato in the pacific northwest. | meloidogyne chitwoodi n. sp. is described and illustrated from potato (solanum tuberosum) originally collected from quincy, washington, usa. this new species resembles m. hapla, but its perineal pattern is basically round to oval with distinctive and broken, curled, or twisted striae around and above the anal area. the vulva is in a sunken area devoid of striae. vesicles or vesicle-like structures are present in the median bulb of females. the larva tail, being short and blunt with a hyaline tai ... | 1980 | 19300709 |
| effect of phenamiphos on heterodera schachtii and meloidogyne javanica. | aqueous solutions of technical-grade phenamiphos [ethyl 3-methyl-4-(methylthio) phenyl (1-methylethyl) phosphoratnidale] were used in hatching chambers to test, under laboratory tory conditions, the effect of phenamiphos on the hatching and movement of meloiclogyne javanica and heterodera schachtii. hatch of m. javanica and h. schachtii eggs was depressed 70 and 88% by nematicide at 0.48 and 4.80 mug/ml, respectively. the infectivity of second-stage larvae of both species was affected by concent ... | 1980 | 19300678 |
| interrelationship of meloidogyne hapla and ditylenchus dipsaci on resistant and susceptible alfalfa. | simultaneous inoculations of alfalfa with meloidogyne hapla larvae and ditylenchus dipsaci at 16, 20, 24, and 28 c did not depress penetration of either nematode in 'nev syn xx' -a selection resistant to m. hapla and d. dipsaci, 'vernal 298' -a selection resistant to m. hapla and susceptible to d. dipsaci, 'lahontan' -a cultivar resistant to d. dipsaci and susceptible to m. hapla, and 'ranger' -a cultivar susceptible to both m. hapla and d, dipsaci. infection with d. dipsaci depressed growth of ... | 1980 | 19300705 |
| interrelations between meloidogyne javanica, rotylenchulus reniformis, and rhizobium sp. on vigna sinensis. | the interactions of meloidogyne javanica, rotylenchulus reniformis, and rhizobium sp. on cowpea seedlings were investigated. upon simultaneous inoculation with the two nematode species, m. javanica invaded first but did not affect root invasion by r. reniformis. m. javanica populations increased less in competition with r. reniformis than when present alone. preinvasion by r. renilormis significantly suppressed the number of m. javanica in the roots. inoculation of m. javanica and/or r. reniform ... | 1980 | 19300672 |
| effects of one and two applications of nematicides on nematode populations and soybean yields. | yields of 'mcnair 800' soybeans, glycine max (l.) merr., were significantly increased with ethylene dibromide + chloropicrin, dbcp, phenamiphos, and aldicarb applied at-planting and with phenamiphos, aldicarb, and dbcp applied postplant to soil infested with meloidogyne incognita (kofoid and white) chitwood. yields of 'gasoy 17' were significantly increased with ethylene dibromide + chloropicrin, dbcp, phenamiphos, and aldicarb applied, preplant and with dbcp, carbofuran, phenamiphos, aldicarb, ... | 1980 | 19300706 |
| control of meloidogyne javanica and m. arenaria on kenaf and roselle with genetic resistance and nematicides. | kenaf (hibiscus cannabinus) and roselle (h. sabdarifla) were evaluated in nematicide-treated and untreated field soil naturally infested with either meloidogyne javanica or m. arenaria. root-knot indices indicated that the kenaf breeding line j-l-113 had moderate resistance to m. javanica and low resistance to m. arenaria. kenaf cv everglades 71 was highly susceptible to both m. javanica and m. arenaria, and roselle breeding line a59-56 was highly resistant. both nematode species reproduced on a ... | 1979 | 19305526 |
| meloidogyne megatyla n. sp. a root-knot nematode from loblolly pine. | meloidogyne megatyla n. sp. is described from pinus taeda in north carolina. stylet knobs are distinctively high in proportion to width, giving an especially massive appearance to the knobs of larvae and males. mean larval length is 416 mum and stylet length is 14.6 mum. the perineal pattern is composed of smooth striae, with a high arch, and is often somewhat rectangular. the relationship of m. megatyla to other meloidogyne species is unclear, although a comparison is made with meloidogyne inco ... | 1979 | 19305528 |
| the histopathological reactions of vigna sinensis to separate and concomitant parasitism by meloidogyne javanica and rotylenchulus reniformis. | cellular alterations in cowpea roots and nodules induced by single and concomitant meloidogyne javanica and rotylenchulus reniformis were investigated. m. javanica induced giant cells inside the vascular bundles of roots and nodules, and syncytia in cortical tissue of the nodules. in contrast, r. reniformis stimulated hypertrophy of pericycle and endodermal cells of the roots and nodules. syncytia induced in the roots involved a sheet of pericycle cells and an endodermal cell. cortical ceils of ... | 1979 | 19305543 |
| effects of nematicide placement on nematode populations and soybean yields. | four methods of placement of dbcp (l,2-dibromo-3-chloropropane) and a single method of application of ethoprop (0-ethyl s,s-dipropyl phosphorodithioate) wexe compared in each of two areas for control of nematodes on soybeans. one area was a marlboro sand infested with hoplolaimus columbus. the other area was a fuquay loamy sand infested with meloidogne incognita. soybean yields were increased and numbers of h. columbus in the row 0-20 cm deep were decreased similarly by all methods of dbcp appli ... | 1979 | 19305549 |
| descriptions of meloidogyne camelliae n.sp. and m. querciana n.sp (nematoda:meloidogynidae), with sem and host-range observations. | meloidogyne camelliae n.sp. on camellia (camellia japonica) from japan and m. querciana n.sp. on pin oak (quercus palustris) from virginia, usa, are described and illustrated. m. camelliae n.sp. is distingnishable from other species of the genus especially by its striking perineal pattern having heavy ropelike striae forming a squarish to rectangular outline with shoulders or projections, appearing sometimes ahnost starlike. m. querciana differs from other species by its characteristic perineal ... | 1979 | 19305554 |
| quantitative aspects of the development of meloidogyne arenaria larvae in grapevine varieties and rootstocks. | the development and productivity of parasitic stages of meloidogyne arenaria were quantitatively defined in 14 varieties or rootstocks of grapevine. mean development to maturity was related linearly to the number of degree-hours above 10 c temperature experienced from the time of penetration in all cultivars in which nematode adulthood was achieved. averaged across varieties, 13,142 heat units were required for development of the mean individual to maturity. the standard deviation of the develop ... | 1979 | 19305553 |
| partial characterization of the cuticle surface of meloidogyne javanica females. | negative charges on the outer cuticular surface of meloidogyne javanica females were visualized with electron microscope labelling techniques. evidence is presented that the electronegative charge is not borne on neuraminic acid. ruthenium red staining indicated acid mucopolysaccharides on the outer surface. a surface coat, or glycocalyx, external to the outer cuticle membrane was demonstrated. | 1979 | 19300656 |
| histochemical localization and nematoxicity of terpenoid aldehydes in cotton. | in healthy cotton, except for random occasional occurrence in cortical cells, terpenoid aldehydes (ta) are localized in the epidermis and, even there, are absent from the tip 2-4 cm of the root. since constitutive ta do not occur in the endodermis and stele of the root, they cannot be effective agents against the development of the sedentary stage of the root-knot nematode, meloidogyne incognita. within 4 days after inoculation with the root-knot nematode, infection-induced ta accumulated in the ... | 1979 | 19300641 |
| effect of oryzalin and 1,1-dimethylpiperidinium chloride on cotton and tomato roots infected with the root-knot nematode, meloidogyne incognita. | oryzalin (3,5-dinitro-n4,n4-dipropyl-sulfanilamide) and bas 083 (l,l-dimethylpiperdinium chloride) reduced root-knot infection in tomato roots when respectively applied as a soil drench at 20 ppm and 10,000 ppm. oryzalin reduced knot counts with various intervals between treatment and inoculation. bas 083 reduced knot counts only when applied before inoculation. oryzalin was shown not to be a contact nematicide, and bas 083 was only a weak one. neither compound reduced penetration by infective l ... | 1979 | 19305533 |
| nonfumigant nematicides for control of root-knot nematode to protect carrot root growth in organic soils. | greenhouse tests were conducted to determine the effects of two kinds of meloidogyne hapla inoculum on the growth and quality of carrot roots, and the protection afforded in each case by nonfumigant nematicides in organic soils. for all treatments the percentage of carrots damaged was greater with larvae alone as inoculum than with larvae and eggs, indicating that most of the damage occurs early during formation of the taproot. fosthietan, aldicarb, and oxamyl at 4 and 6 kg ai/ha protected the r ... | 1979 | 19300652 |
| ontogeny of daucus carota infected with meloidogyne hapla. | the ontogeny of carrots (daucus carota cv. 'spartan premium') grown under greenhouse conditions in pots of organic soil infected with meloidogyne hapla was influenced detrimentally as early as 4 days after seeding, as determined through analysis of plant surface area, dry weight, fresh weight, net assimilation rate, relative growth rate, and leaf-area ratio. only 58% of the diseased carrots were suitable for fresh market, compared with 97% of those grown in nematode-free soil. growth and develop ... | 1978 | 19305837 |
| root-knot nematodes and the process of ageing in plants. | infection of plants by root-knot nematodes is often accompanied by physiological changes characteristic of ageing. ultra-low tissue luminescence of infected plants indicated oxidation of cell-membrane lipids. cells with membranes subjected to oxidation lose some of their capacity for water retention. treating tomato and radish with lidocaine hydrochloride, an inhibitor of lipid oxidation, retarded above-ground symptoms of root-knot nematode infection and of ageing. | 1978 | 19305822 |
| influence of low temperature on development of meloidogyne incognita and m. hapla eggs in egg masses. | egg masses of meloidogyne incognita and m. hapla were placed in soil at 10, 12, 16, and 20 c. at regular intervals, eggs from samples of egg masses were released from the gelatinous matrices and their developmental stages recorded. the number of days necessary to complete each stage from gastrulation to hatch is given for each temperature. the minimal temperature threshold for the development of eggs was computed by linear regression to be 8.26 c for m. incognita and 6.74 c for m. hapla. | 1978 | 19305859 |
| temperature-based prediction of egg-mass production by meloidogyne incognita. | a maturation-rate relationship for meloidogyne incognita on lycopersicon esculentum 'rutgers' was derived and used to estimate harvest dates for maximum egg hatch from laboratory cultures at ambient temperatures. daily maturation increments were totaled (nematode maturation total, nmt) and correlated with hatch from isolated white, yellow, and amber egg masses. hatch per mass fluctuated periodically from ca. 1.0 nmt, when egg masses were first visible, to 2.5 nmt by which time plants showed stre ... | 1978 | 19305857 |
| meloidogyne incognita wartellei n. subsp. (meloidogynidae), a root-knot nematode on resistant soybeans in louisiana. | meloidogyne incognita wartellei n. subsp, is described and illustrated from roots of soybean (glycine max l.) near washington, louisiana. it is rather limited in distribution in that state, being known at five locations comprising about 60,000 acres. it not only attacks commonly susceptihle soybeans but is a destructive pest on other commercial soybean varieties that are resistant to other forms of the m. incognita group in the area. this new subspecies is related most closely to m. i. incognita ... | 1978 | 19305855 |
| influence of chilling and freezing temperatures on infectivity of meloidogyne incognita and m. hapla. | egg masses and second-stage larvae of meloidogyne incognita and m. hapla in soil were exposed to temperatures ranging from 20 to -8 c. temperature was lowered in 2-day intervals to 16, 12, 8, 4, 0, -4, and -8 c, and the nematodes remained at 4, 0, -4, or -8 c for 18, 14, 10, or 6 days, respectively. unhatched larvae of both species were more resistant to low temperatures than were embryonic stages. within the eggs of m. incognita, 7.5% of embryos and 48% of larval stages survived 14 days at 0 c, ... | 1978 | 19305834 |
| anatomical response of grain sorghum roots to meloidogyne incognita acrita. | the cotton root-knot nematode, meloidogyne incognita acrita, reproduced on the roots of grain sorghum, causing syncytia in the cortex or stele of lateral roots. giant cells developed either singly with few nuclei or in groups with many nuclei. giant cells that developed in groups appeared the same as those which developed singly. the pericycle and endodermis were interrupted at the site of nematode invasion. large areas of these tissues were absent for one-third of the circumference of the stele ... | 1978 | 19305813 |
| peroxidase and 6-phosphogluconate dehydrogenase in resistant and susceptible cotton infected by meloidogyne incognita. | assays of specific activities and electrophoretic separations of multiple forms of 6-phosphogluconate dehydrogenase and peroxidase in cotton resistant and susceptible to meloidogyne incognita were conducted 6 days after inoculation. specific activities were greater in infected than in uninfected roots and also were greater in the resistant cultivar, 'clevewilt 6-3-5,' than in the susceptible culti.var, 'm8.' in uninfected roots, peroxidase activity was greater in clevewilt roots than in m8 roots ... | 1978 | 19305810 |
| effects of aldicarb on fusarium wilt-root-knot nematode disease of cotton. | 1978 | 19305871 | |
| evaluation of the protective and therapeutic properties of dbcp for control of root-knot nematode on tomato. | twelve soil drenches over a period of 30 days with dbcp concentrations of 40 microg/ml did not completely prevent infection of tomato plants by root-knot nematode juveniles. repeated dbcp drenches of 40 microg/ml halted gall development during the drenches, but 10 days after drenching was discontinued galls were apparent. dbcp drenches at 200 microg/ml prevented tomato root development, and 40 microg/ml slowed it. ten microg/ml increased the height of root-knot-infected plants, but not their top ... | 1978 | 19305858 |
| the effect of diflubenzuron on egg formation by the root-knot nematode. | 1978 | 19305842 | |
| early stages of nematode-induced giant-cell formation in roots of impatiens balsamina. | giant cells induced in roots of impatiens balsamina by meloidogyne javanica and meloidogyne incognita have been examined by light and electron microscopy. the first sign of giant-cell formation was division of cells surrounding a larva. cell plate alignment appeared to proceed normally, but cytokinesis was unsuccessful and binucleate cells formed subsequently. no wall breakdown was evident then or later. the number of nuclei appeared to increase by repeated mitosis without separation by cytokine ... | 1978 | 19305816 |
| reaction of citrus rootstocks to meloidogyne javanica. | the response of citrus spp. and related rootstocks to a population of meloidogyne javanica was evaluated in a screenhouse experiment. palestine and rangpur lime, rough lemon, sour orange, sexton and thentriton tangelo, and volkamer lemon were not infected by m. javanica. galls and tip swellings were observed on the roots of poncirus triloliata and troyer citrange. there was no evidence of nematode development. symptoms induced by the nematode were stelar division, syncytia formation in the vascu ... | 1978 | 19305835 |
| influence of soil fumigation on the fusarium-root-knot nematode disease complex of cotton in california. | for control of the root-knot nematode, meloidogyne incognita, and the pathogenic wilt fungus, fusarium oxysporum, on cotton, soil fumigants were applied in the field at conventional and higher rates. conventional rates suppressed fusarium wilt but higher rates gave quicker early growth, better stands, less stand loss over the season, a lower percentage of plants infected with wilt, fewer plants with vascular discoloration, and fewer nematodes. the best treatment about doubled the yields of untre ... | 1978 | 19305846 |
| meloidogyne grahami n. sp. (meloidogynidae), a root-knot nematode on resistant tobacco in south carolina. | meloidogyne grahami n. sp. is described and illustrated from specimens on tobacco (nicotiana tabacum) originally from florence, south carolina. considered for several years to be only a race of m. ineognita, this new species readily attacks nc-95 tobacco, a variety with resistance to the m. incognita group that is common in the major u.s. tobacco-producing areas. m. grahami n. sp. is related most closely to the three subspecies of the m. incognita group but differs from all of them, especially i ... | 1978 | 19305866 |
| infectivity of bacillus penetrans in plant-parasitic nematodes. | larvae of meloidogyne spp. were readily infected with the endoparasite bacillus penetrans by exposure to an aqueous suspension of spores from infected root-knot nematode females, or by passage of larvae through a shallow layer (50 cm(3)) of spore-infested soil. infection severely reduced motility of second-stage larvae through soil. bacillus penetrans exhibited a distinct host specificity in that only 5 of 16 nematode species tested became infected with the population used. meloidogyne javanica, ... | 1977 | 19305569 |
| effects of management practices on nematode and fungi populations and okra yield. | okra was grown in field plots of tifton loamy sand naturally infested with the nematodes meloidogyne incognita and criconemoides ornalus and the pathogenic fungi fusarium oxysporum, f. solani, f. roseum, and pythium spp. plots were treated with various soil pesticides and left exposed or covered with biodegradable paper film mulch under trickle irrigation. soil was assayed for nematodes and fungi, and plant roots were examined for root-rot and insect damage. fewer nematodes and fungi generally w ... | 1977 | 19305580 |
| terpenoid aldehydes in cotton roots susceptible and resistant to the root-knot nematode, meloidogyne incognita. | we investigated the role of terpenoid aldehydes in the resistance of cotton (gossypium hirsutum) to the root-knot nematode (meloidogyne incognita). three-day-old, root-knot-resistant ('auburn 623') and -susceptible ('deltapine 16') seedlings were inoculated with m. incognita. comparable portions of inoculated and noninoculated roots were harvested 2, 4, 7, and 10 days later. terpenoid aldehydes were extracted, separated by thin-layer chromatography, eluted as their phloroglucinol derivatives, an ... | 1977 | 19305600 |
| ultrastructure of anterior sensory organs of the root-knot nematode, meloidogyne incognita. | 1977 | 864822 | |
| the nature and role of metabolic leakage from root-knot nematode galls and infection by rhizoctonia solani. | a severe root rot of tomato caused by meloidogyne incognita and rhizoctonia solani was associated with nutrient mobilization into gall tissue and root exudation. root decay did not develop when root exudates were continuously removed by leaching. when leachates were collected from m. incognita-infected and control roots and applied to roots of tomatoes inoculated with r. solani alone, roots receiving leachates from m. incognita-infected roots developed a severe rot while roots receiving leachate ... | 1977 | 19305577 |
| effects of population densities of meloidogyne hapla on growth and yield of tomato. | growth and yield of 'veebrite' tomato were studied in 20-cm (i.d.) clay-tile microplots containing initially 260, 1,840, 6,120, or 27,950 meloidogyne hapla larvae/kg of soil. low nematode numbers stimulated, and the highest nematode population suppressed, vegetative plant growth. more tomatoes, with a higher total weight, were harvested from plants infested with 260 and 1,840 nematode larvae at planting than from those with initial densities of 6,120 and 27,950 larvae. at the two highest densiti ... | 1977 | 19305611 |
| penetration and development of meloidogyne hapla in resistant and susceptible alfalfa under differing temperatures. | studies were conducted to examine under differing temperatures (12, 16, 20, 24, 28, and 32 c) the penetration anti development of meloidogyne hapla in resistant lines '298' and 'nev. syn xx', and susceptible 'lahontan' and 'ranger' hardy-type alfalfas. the results indicated that resistance to m. hapla was similar to that previously described for m. incognita in nonhardy alfalfa. although initial penetration in resistant seedlings was similar to that of susceptible seedlings, nematode larvae fail ... | 1977 | 19305571 |
| relationships of initial population densities of meloidogyne incognita and m. hapla to yield of tomato. | microplots 80 x 100 cm, infested with varying initial population densities (p(i)) of meloidogyne incognita or m. hapla, were planted to tomato at two locations. experiments were conducted in a sandy loam soil at fletcher, n. c. (mountains) where the mean temperature for may to september is ca 20.7 c, and in a loamy saml at clayton, n. c. (coastal plain) where the mean temperature for may to septemher is ca 24.8 c. in these experimentally infested plots, m. incognita and m. hapla caused maximum y ... | 1976 | 19308228 |
| ultrastructure of a neurosensory organ in a root-knot nematode. | 1976 | 957473 | |
| life cycle, pathogenicity, histopathology, and host range of race 5 of the barley root-knot nematode. | the optimum temperature for development of race 5 of meloidogyne naasi was 26 c. a life cycle was completed in 34 days. growth of sorghum was suppressed when inoculated with m. naasi. observations of m. naasi-infected sorghum roots demonstrated that roots were penetrated just behind the root cap; giant cells were generally initiated either in the procambial region or in very young phloem. when giant cells developed in the cortex, corresponding areas of the vascular system did not have an endoder ... | 1976 | 19308227 |
| comparative fine structure of the stomatal region of males of meloidogyne incognita and heterodera glycines. | the fine structure of the stylet, "guiding apparatus," anti protractor muscles of males of meloidogyne incognita and heterodera glycines is ehtcittated and compared. in both nematodes, the stylet cone is of greater electron density than the shaft. the cone is heterogeneous; shaft material extends into it for most of its length, whereas the shaft proper and knob regions are relatively homogeneous. the stylet lumnen is round throughout its length in h. glycines, but in m. incognita changes from ro ... | 1976 | 19308188 |
| influence of pratylenchus vulnus and meloidogyne hapla on the growth of rootstocks of rose. | pratylenchus vulnus is involved in a desease of rosa noisettiana 'manetti' rose rootstock characterized by darkening of roots, death of feeder roots, and stunting of entire plants. the disease is more severe when plants are grown in silt loam soil than when they are grown in sandy loam soil. the nematodes reproduce best in silt loam soil at 20 c. meloidogyne hapla did not affect the growh of manetti. rosa sp. 'dr. huey', manetti, and r. odorata rose rootstocks were found to be goos hosts for p. ... | 1976 | 19308189 |
| self-interactions of meloidogyne hapla and of heterodera schachtii on beta vulgaris. | double inoculations of sugar beet with larvae of meloidogyne hapla resulted in a higher galling incidence in only one treatment than did a single inoculation using the same number of larvae. double inoculations with larvae of heterodera schachtii, however, resulted in three- to five-fold more cysts in most cases than did single inoculations using the same number of larvae. in general, plants died more quickly after double inoculations than after single inoculations of the same total number of ei ... | 1976 | 19308195 |
| scanning electron microscopy in nematode-induced giant transfer cells. | a study of giant cells induced by the root-knot nematode, meloidogyne incognita, in roots of impatiens balsamina was made by scanning electron microscopy. the cytoplasmic contents of giant cells were removed by a procedure based on koh digestion, to reveal inner wall structure. wall ingrowths typical of transfer cells are present in giant cells from six days onwards after induction. they develop on walls adjacent to vascular tissues, and their distribution and development was examined. pit field ... | 1976 | 1001022 |
| effects of aldicarb on the behavior of heterodera schachtii and meloidogyne javanica. | the toxic effects of sublethal concentrations of aldicarb were studied on eggs and second-stage larvae and males of heterodera schachtii and second-stage larvae only of meloidogyne javanica in a quartz sand substrate. aldicarb was more toxic to eggs of h. schachtii than to those of m. javanica. complete suppression of hatching occurred between 0.48 and 4.8 microg/ml aldicarb for h. schachtii whereas 100% inhibition of hatch of m. javanica occurred between 4.8 and 48.0 microg/ml. m. javanica hatc ... | 1975 | 19308160 |
| pathogenicity of pratylenchus coffeae, scutellonema bradys, meloidogyne incognita, and rotylenchus reniformis on dioscorea rotundata. | low populations (200 specimens per plant) of pratylenchus cofl'eae, scutellonema bradys, meloidogyne incognita, and rotylenchulus reniformis stimulated the development of tops, roots, and tubers of dioscorea rotundata "guinea" yam. we demonstrated experimentally that p. coffeae was responsible for the deterioration in quality of the yam tuber in puerto rico, a condition known as a dry rot of yam. initial populations of 600 p. coffeae, s. bradys, or m. incognita, and populations of 1,000 p. coffe ... | 1975 | 19308127 |
| temperature-induced phase transitions in nematode lipids and their influence on respiration. | temperature-induced phase transitions estimated by electron spin resonance (esr) technique were ohscrved in the lipids of several nematode species. in both meloidogyne javanica and caenorhahditis elegans, there was a phase transition in their phospholipids from a liquid-crystalline state to a solid gel state at about 10 c. aphelenchus avenae also had a phase transition, but at about 20 c. with this species, the spin-label motion parameters indicated the transition was from the liquid-crystalline ... | 1975 | 19308140 |
| body wall fine structure of the anterior region of meloidogyne incognita and heterodera glycines males. | the body wall fine structure including the cuticle, hypodermis, and somatic muscles is similar in males of meloidogyne incognita and heterodera glycines. the cuticle can be regarded as basically three-layered in both species, but is much thicker in m. incognita than in h. glycines, and differences occur in surface markings. the chordal and interchordal hypodermis is syncytial. hypodermal tissue pervades the lip region, and lines the stomatal cavity and stylet shaft. various organelles and struct ... | 1975 | 19308152 |
| influence of meloidogyne incognita on the content of amino acids and nicotine in tobacco grown under gnotobiotic conditions. | seedlings of meloidogyne incognita-resistant (n.c. 95) and -susceptible (mcnair 30) tobacco cultivars were grown aseptically for 55 days inside isolator chambers in autoclaved soil infested with 0 or 3,000 axenized eggs of m. incognita per 500 cc of soil. healthy and infected plants were compared. dry root weights of infected plants of resistant and susceptible cultivars were 16% and 84%, respectively, less than the controls. sixteen amino acids, including those precursors for nicotine, and nico ... | 1975 | 19308177 |
| the incorporation of photosynthates by meloidogyne javanica. | the root-knot nematode, meloidogyne javanica, incorporated (1)c from its host after exposure of the plant to (1)co. this uptake was relatively slow and was not detected in nematodes exposed to a labelled plant for periods of 2 and 4 h, but was after 24 h. nematodes were grown in plants previously infected at weekly intervals to provide animals at various stages of growth. plants were harvested 24 h after exposure to the label and the rate of incorporation per unit area of nematode was measured. ... | 1975 | 19308142 |
| meloidogyne incognita-induced changes in cell permeability of galled roots. | electrolyte leakage of meloidogyne incognita-infected and healthy tomato roots was compared by conductivity measurements, and by compartmental analysis using rb. conductivity measurements suggested difference in electrolyte loss from healthy and galled roots. on a percentage basis, a greater rate of efflux occurred for healthy plants, but galled roots contain more electrolytes and may show a larger net loss. compartmental analysis indicated that: (i) the longer half-time for rb loss from vacuole ... | 1975 | 19308167 |
| effect of meloidogyne incognita on selected forest tree species. | four or five growth stages of 14 forest tree species were tested for susceptibility to meloidogyne incognita at five inoculum levels. responses ranged from the highly susceptible 'china fir' to immune 'taiwania'. even highly susceptible species became increasingly tolerant at later growth stages, thus root-knot appears to be a greater problem in nurseries than in established forests. heavily suberized cells which restricted nematode development was the predominant host response in norway spruce, ... | 1975 | 19308146 |
| autoradiography of developing syncytia in cotton roots infected with meloidogyne incognita. | cotton (gossypium hirsutum) seedlings, uniformly infected with meloidogyne incognita, were exposed for periods of 1-15 days to a nutrient solution containing tritium-labelled thymidine. syncytium formation began with the amalgamation of cells near the nematode head, and was followed by synchronized mitoses of the nuclei which had been incorporated into a single cell. syncytial nuclei synthesized dna in roots harvested 3, 6, 9, 12, and 15 days after inoculation. seedlings transferred from unlabel ... | 1975 | 19308135 |
| interaction of four soybean cultivars with subsoiling and a nematicide. | yields of four soybean, glycine max, cultivars were increased with subsoiling under the row and application of the nematicide, dbcp i 1,2-dibromo-3-chloropropane) in tiflon sandy loam heavily infested with the root-knot nematode meloidogyne incognita. these cultivars represent four maturity groups: very early (v), "essex', early (vi), "davis': medium (vii), 'ransom'; and late (viii), ' hutton '. the average increase for the four cullivars was about the same for subsoiling or dbcp. when the treat ... | 1975 | 19308134 |