Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| pathogenicity of the columbia root-knot nematode (meloidogyne chitwoodi) on wheat, corn, oat, and barley. | 1981 | 19300804 | |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 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 |
| 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 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| effects of temperature and root leachates on embryogenic development and hatching of meloidogyne chitwoodi and m. hapla. | at 20 c the duration of the embryogenic development of meloiclogyne chitwoodi and m. hapla was about 20 days. at 10 c the embryogenic development was 82-84 days for m. chitwoodi and 95-97 days for m. hapla. the effect of distilled water and root leachates of potato cv. russet burbank, tomato cv. columbian, and wheat cv. hyslop on the hatching of eggs of the two root-knot nematode species was investigated at 4, 7, 10, 15, 20, and 25 c (+/- 1 c). cumulative egg taatch was no greater in root leacha ... | 1983 | 19295777 |
| 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 |
| effects of concomitant development on reproduction of meloidogyne incognita and rotylenchulus reniformis on sweet potato. | the influence of various factors on reproduction of concomitant meloidogyne incognita (mi) and rotylenchulus reniformis (rr) on sweet potato were studied in the greenhouse. reproduction of rr was reduced by mi at all inoculum levels and experiment durations used, while mi reproduction was not inhibited. both species failed to affect each other when inoculated simultaneously onto root systems developed in separate pots from different nodes of the same plant. reproduction of each species was not s ... | 1983 | 19295794 |
| meloidogyne enterolobii n. sp. (meloidogynidae), a root-knot nematode parasitizing pacara earpod tree in china. | meloidogyne enterolobii n. sp. is described and illustrated from roots of pacara earpod tree, enterolobium contortisiliquum (vell.) morong, on hainan island in china. the perineal pattern of the female is usually oval shaped, the striae are fine to coarse, the dorsal arch is moderately high to high and usually rounded, and the phasmids are large. the stylet knobs in females are divided longitudinally by a groove so that each knob appears as two. the mean distance of the excretory pore to the ant ... | 1983 | 19295822 |
| ultrastructural changes caused by fusarium oxysporum f. sp. lycopersici in meloidogyne javanica induced giant cells in fusarium resistant and susceptible tomato cultivars. | tomato (lycopersicon esculentum mill.) seedlings, susceptible (cv. pearson a-i improved) and resistant (cv. pearson improved) to race 1 fusarium oxysporum f. sp. lycopersici (sacc.) snyd &hans., were inoculated with meloidogyne javanica (trueb) chitwood second-stage juveniles and 3 weeks later with race 1 f. oxysporum f. sp. lycopersici spores. one week after fungal inoculation, no fungus was visible in root tissue of the tomato cultivars and the giant cells were normal. two weeks after fungal i ... | 1983 | 19295778 |
| 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 |
| effects of dosage sequence on the efficacy of nonfumigant nematicides, plantain yields, and nematode seasonal fluctuations as influenced by rainfall. | four nonfumigant nematicides applied three times during the wet season were used to study dosage sequence and nematicide effectiveness. control of helicotylenchus multicinctus (cobb) thorne and meloidogyne javanica (treub) chitwood increased plantain (musa aab) yields. the nematicide (aldicarb, carbofuran, oxamyl, and miral) performance and yield response varied with dosage sequences. applications of 2, 3, and 2 g ai/tree in march, july, and october (sequence i), respectively, gave greater contr ... | 1983 | 19295837 |
| 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 |
| relationship between heterodera schachtii, meloidogyne hapla, and nacobbus aberrans on sugarbeet. | heterodera schachtii, meloidogyne hapla, and nacobbus aberrans either alone, or in various combinations with each other, can, when inoculated at a concentration of 12 second-stage juveniles/ cm(3) of soil, cause a significant (p = 0.01) suppression of growth of sugarbeet (cv. tasco ah14) seedlings. m. hapla and h. schachtii decreased growth of sugarbeet more than n. aberrans over a 60-day period. the adverse effect of n. aberrans on the final population/initial population (pf/pi) ratio for eithe ... | 1984 | 19295890 |
| inhibitory effect of watermelon mosaic virus on meloidogyne javanica (treub) chitwood infecting cucurbita pepo l. | 1984 | 19295884 | |
| population development and pathogenicity of meloidogyne javanica on flue-cured tobacco as influenced by ethoprop and dd. | growth of flue-cured tobacco as influenced by meloidogyne javanica and the effectiveness of dd and ethoprop to manage this nematode were evaluated over two growing seasons. populations of m. javanica, root galling, plant height, steam crown diameter, whole plant weight, and yield were monitored at approximately 2-week intervals beginning 28 days after transplanting. treatment influence on nematode population development, root galling, and plant growth generally followed a pattern in descending o ... | 1984 | 19294018 |
| meloidogyne microcephala n. sp. (meloidogynidae), a root-knot nematode from thailand. | meloidogyne microcephala n. sp. is described and illustrated from specimens obtained from tobacco (nicotiana tabacum l.) in thailand. the female perineal pattern usually has a low dorsal arch, coarse striae, and a series of small cuticular flaps around the tail terminus. the stylet of the female is 14.4 mum long, with large, square to rectangular stylet knobs, the distinctive male head region is narrow, small, and truncate with a low, flattened head cap. the stylet length is 20.6 mum, and the kn ... | 1984 | 19295899 |
| pathogenicity and reproduction of hoplolaimus columbus and meloidogyne incognita on 'davis' soybean. | the effects of initial populations of hoplolaimus columbus and meloidogyne incognita on growth and yield of davis soybean were determined for 1980 and 1981 in microplots and h. columbus in field tests in 1981. m. incognita suppressed yield in microplots both years and h. columbus in 1980. maximum suppression of dry pod weight by m. incognita was 45% and by h. columbus 35%. the relationship of yield vs. nematode population at planting time was described by a declining exponential model. maximum r ... | 1984 | 19294036 |
| rangeland grasses as hosts of meloidogyne chitwoodi. | 1984 | 19294047 | |
| effect of soil temperature on reproduction of meloidogyne chitwoodi and m. hapla alone and in combination on potato and m. chitwoodi on rotation plants. | meloidogyne chitwoodi developed and reproduced more rapidly than m. hapla in potato roots at 15, 20, or 25 c when both species of nematodes were inoculated simultaneously at 250 or 1,000 juveniles of each. at 30 c significantly more m. hapla than m. chitwoodi females were found at the lower inoculum level after 41 days. more m. chitwoodi than m. hapla juveniles were extracted from soil at 15, 20, and 25 c, but only at the lower inoculum level at 30 c. potato was considered a more suitable host f ... | 1984 | 19294027 |
| influence of meloidogyne chitwoodi and m. hapla on wheat growth. | meloidogyne chitwoodi reduced the growth of winter wheat 'nugaines' directly in relation to nematode density in the greenhouse, the relationship between top dry weight and initial nematode density suggests a tolerance limit of nugaines wheat to m. chitwoodi of between 0.03 and 0.18 eggs/cm(3) of soil; the value for relative minimum plant top weight was 0.45 g and 0.75 g, respectively. growth of wheat in field microplots containing four population densities (0.003, 0.05, 0.75 and 9 eggs/cm(3) soi ... | 1984 | 19295895 |
| nematicides and nonconventional soil amendments in the management of root-knot nematode on cotton. | granular and liquid commercial humates, with micronutrients, and a microbial fermentation product were compared in several combinations with nematicides for their effects on cotton lint yield and root-knot nematode suppression. fumigant nematicides effectively reduced cotton root galling caused by root-knot nematodes, and cotton lint yields increased. organophosphates and carbamates were not effective. occasionally, cotton lint yields were increased or maintained with combination treatments o f ... | 1984 | 19295893 |
| cropping effects of marigolds, corn, and okra on population levels of meloidogyne javanica and on carrot yields. | 1984 | 19294045 | |
| influence of nacobbus aberrans densities on growth of sugarbeet and kochia in pots. | 1984 | 19294044 | |
| a new pathotype of root-knot nematode on grape rootstocks. | 1984 | 19295902 | |
| influence of urea, hydroxyurea, and thiourea on meloidogyne javanica and infected excised tomato roots in culture. | urea (u), hydroxyurea (hu), and thiourea (tu), in various concentrations, were added to chemically defined plant tissue culture medium on which meloidogyne javanica was reared on excised tomato roots. concentrations as low as 3 ppm hu or 12 ppm tu inhibited nematode maturation by 70-90% 4 weeks after inoculation, and the coenocytes in the parasitized tissue were poorly developed. gall weight was also inhibited by 50% in cultures treated with 3 and 6 ppm hu. however, exposing juveniles of m. java ... | 1984 | 19295888 |
| effect of inhibitors and stimulators of ethylene production on gall development in meloidogyne javanica-infected tomato roots. | excised tomato roots infected with meloidogyne javanica produced ethylene at 3-6 times the rate of noninfected roots. this increase in ethylene production started 5 days after inoculation. gall growth and ethylene production in infected roots were accelerated by 1-aminocyclopropane-1-carboxylic acid (acc), indole acetic acid (iaa), and ethrel known as ethylene production stimulators. when inhibitors of ethylene production, like aminoethoxyvinylglycine (avg) or aminoxyacetic acid (aoa), or inhibi ... | 1985 | 19294073 |
| ethylene production by meloidogyne spp.-infected plants. | gall size and rates of ethylene production by various hosts infected with meloidogyne javanica and by excised tomato root cultures infected with m. javanica or m. hapla were measured. infection with m. javanica increased the rate of ethylene production in dicotyledonous plants (cabbage, pea, carrot, cucumber, carnation, and tomato), but not in infected monocotyledonous plants (corn, wheat, and onion). nematode infection induced large galls on roots of dicotyledonous, but not monocotyledonous, pl ... | 1985 | 19294059 |
| an induced resistance effect of hydroxyurea on plants infected by meloidogyne javanica. | aqueous solutions of hydroxyurea (hu) in various concentrations were applied as soil drenches to meloidogyne javanica-infected plants. at a concentration of 15 ppm, the chemical hampered giant cell formation and the number of females on the roots was 20% of that of the control but the growth of the host plants was not affected. additional hu applications after the one at infection did not add to the inhibitory effect. hu exerted its effect on m. javanica-infected tomato in five soil types. soil ... | 1985 | 19294052 |
| isolation of subcellular granules from second-stage juveniles of meloidogyne incognita. | subcellular granules from the second-stage (preparasitic) juveniles of root-knot nematode meloidogyne incognita were isolated by isopycnic centrifugation on percoll. the granules had an apparent density of 1.13 g/cm(3). the relative specific activity of acid phosphatase in the granule extract was 8.4. acid phosphatase activity was also detected histochemically in the subventral gland granules. electron microscopy and malate dehydrogenase activity indicated that contamination of granules by mitoc ... | 1985 | 19294128 |
| behavior of tethered meloidogyne incognita. | the tethered-nematode technique was adapted for use with second-stage juveniles of meloidogyne incognita. the data demonstrate that m. incognita exhibits the same patterns of behavior as adults of the free-living nematode, caenorhabditis elegans. the principal differences are that m. incognita is slower and less regular in its behavior than c. elegans. the frequency of normal waves is about 0.2 hz; that of reversal waves is about 0.06 hz. reversal bouts last about 1 minute. in response to a chan ... | 1985 | 19294124 |
| control of root-knot nematodes on tomato by the endoparasitic fungus meria coniospora. | the endoparasitic nematophagous fungus meria coniospora reduced root-knot nematode galling on tomatoes in greenhouse pot trials. the fungus was introduced to pots by addition of conidia at several inoculum levels directly to the soil or addition of nematodes infected with m. coniospora to the soil; both methods reduced root galling by root-knot nematodes. these studies represent a part of a recently initiated effort to evaluate the potential of endoparasitic nematophagous fungi for biocontrol of ... | 1985 | 19294101 |
| population densities of meloidogyne incognita and yield of capsicum annuum. | two microplot experiments in 1981 and 1983 provided information on the effect of different population densities of meloidogyne incognita race 1 and yield of sweet pepper. microplots were square concrete pipes (30 x 30 cm and 50 cm long) filled with 40 liters of soil infested with 0, 0.062, 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256, and 512 eggs and juveniles/cm(3) soil. tolerance limits of 2.2 and 0.165 eggs and juveniles/cm(3) soil and minimum yields of 58% and 20% of the controls were ... | 1985 | 19294056 |
| host-parasite relationship of meloidogyne chitwoodi on potato. | the soil fumigant 1,3-dichloropropene gave good to excellent control of the columbia root-knot nematode, meloidogyne chitwoodi, on potato, solanum tuberosum l. nonfumigant nematicides (aldicarb, fensulfothion, carbofuran, ethoprop, and phenamiphos) were less effective in controlling m. chitwoodi, since the nematode affects tuber quality more than quantity. soil temperature during the growing season affected parasitism of m. chitwoodi on potato more than did the initial nematode population. there ... | 1985 | 19294115 |
| development of meloidogyne chitwoodi on wheat. | postinfection development of meloidogyne chitwoodi from second-stage juveniles (j2) to mature females and egg deposition on 'nugaines' winter wheat required 105, 51, 36, and 21 days at 10, 15, 20, and 25 c. at 25 c, the j2 induced cavities and hyperplasia in the cortex and apical meristem of root tips with hypertrophy of cortical and apical meristem cell nuclei, 2 and 5 days after inoculation. giant cells induced by late j2 were observed in the stele 10 days after inoculation. clusters of egg-la ... | 1985 | 19294100 |
| host suitability and reaction of bean and pea cultivars to meloidogyne chitwoodi and m. hapla. | 1985 | 19294062 | |
| influence of glomus fasciculatum and meloidogyne hapla on allium cepa in organic soils. | the influence of meloidogyne hapla and glomus fasciculatum on allium cepa (onion) grown in organic soil was evaluated under greenhouse conditions. in the absence of g. fasciculatum, m. hapla significantly retarded the growth of a. cepa cv. krummery special and msu 8155 x 826, but had no detrimental influence on downing yellow globe, spartan banner, or spartan sleeper. all five cultivars maintained populations of m. hapla, final root population densities of m. hapla associated with spartan banner ... | 1985 | 19294058 |
| influence of meloidogyne hapla on alfalfa yield and host population dynamics. | self-thinning in alfalfa, a dynamic process involving the progressive elimination of the weakest plants, was enhanced by meloidogyne hapla. alfalfa stand densities decreased exponentially with time and were reduced 62% (p = 0.05) in the presence of m. hapla. as stand densities decreased over time, mean plant weights increased at a rate 2.59 times faster in the absence of m. hapla. in a stepwise multiple regression analysis, 65% of the total variation in yield could be explained by changes in sta ... | 1985 | 19294119 |
| population trends and vertical distribution of plant-parasitic nematodes associated with vitis labrusca l. in michigan. | nematode population trends and vertical distribution were monitored in a southwest michigan vineyard (vitis labrusca cv. concord) from 1976 through 1983. shallow (20 cm) and deep (90 cm) applications of 1,3-dichloropropene applied at 281 (shallow) plus 658 or 1,122 (deep) liters/ ha provided excellent control of xiphinema americanum, criconemella xenoplax, and meloidogyne hapla. populations of x. americanum remained below detectable levels for the entire 8-year experimental period where the fumi ... | 1985 | 19294066 |
| root penetration by meloidogyne incognita juveniles infected with bacillus penetrans. | bacillus penetrans inhibited penetration by meloidogyne incognita second-stage juveniles (j2) into tomato roots in the laboratory and greenhouse. spores from this florida population of b. penetrans attached to j2 of m. javanica, m. incognita, and m. arenaria. a greater proportion of j2 of m. javanica were infected than were j2 of either m. incognita or m. arenaria, and a greater number of spores attached to m. incognita than to m. arenaria. | 1985 | 19294069 |
| description of meloidogyne pini n. sp., a root-knot nematode parasitic on sand pine (pinus clausa), with additional notes on the morphology of m. megatyla. | meloidogyne pini n. sp. is described from sand pine, pinus clausa, in georgia. the perineal pattern of the female has a large cuticular ridge surrounding a deeply recessed perivulval area. the lateral fields are marked by transverse striae. the female stylet is 14.6 mum long, and the knobs are small, rounded, and set off from the straight and narrow shaft. the excretory pore is near the level of the base of the stylet. the labial disc of the male is large, rounded, and fused with the crescent-sh ... | 1985 | 19294083 |
| responses of the plant parasitic nematodes rotylenchulus reniformis, anguina agrostis and meloidogyne javanica to chemical attractants. | rotylenchulus reniformis, anguina agrostis and meloidogyne javanica respond differently to gradients of chemical attractants. in chemotaxis assays performed on agarose plates, r. reniformis l2 larvae oriented their movement to several common inorganic salts, cyclic amp and amp, as well as to germinated host plant seeds. m. javanica l2 larvae were attracted to germinated seeds, but not to the salts tested, and a. agrostis dauer larvae were not strongly attracted to any of 12 different tested agen ... | 1985 | 2993986 |
| interrelationship of heterodera schachtii and meloidogyne hapla on tomato. | invasion of tomato (lycopersicon esculentum l.) roots by combined and sequential inoculations of meloidogyne hapla and a tomato population of heterodera schachtii was affected more by soil temperature than by nematode competition. maximum invasion of tomato roots, by m. hapla and h. schachtii occurred at 30 and 26 c, respectively. female development and nematode reproduction (eggs per plant) of m. hapla was adversely affected by h. schachtii in combined inoculations of the two nematode species. ... | 1985 | 19294113 |
| host-parasite relationships of meloidogyne arenaria and m. incognita on susceptible soybean. | pathogenicity and reproduction of single and combined populations of meloidogyne arenaria and m. incognita on a susceptible soybean (glycine max cv. davis) were investigated. significant galling and egg mass production were observed on roots of greenhouse-grown soybean inoculated with m. arenaria and m. incognita, in combination and individually. m. arenaria produced more galls and egg masses than m. incognita, whereas in combined inoculation with both nematode species, gall and egg production w ... | 1985 | 19294112 |
| interrelationships of meloidogyne arenaria and m. incognita on tolerant soybean. | reproduction of meloidogyne arenaria race 2 was excellent on centennial, govan, and kirby soybeans, the latter two of which have tolerance to this species. the m. incognita race 1 isolate reproduced poorly on centennial, especially at the higher of two temperature regimes. numbers of galls and egg masses of m. arenaria plus m. incognita in simultaneous equivalent infestations on centennial did not differ from sequential infestations in which m. arenaria was added first and m. incognita was added ... | 1986 | 19294149 |
| control of heterodera carotae, ditylenchus dipsaci, and meloidogyne javanica with fumigant and nonfumigant nematicides. | five field trials were conducted in italy in 1983 and 1984 to test the efficacy of isazofos and benfuracarb in controlling heterodera carotae on carrot, ditylenchus dipsaci on onion, and meloidogyne javanica on tomato. methyl isothiocyanate (mit) was tested against h. carotae and m. javanica. single (10 kg a.i./ha) and split (5 + 5 kg a.i./ha) applications of isazofos gave yield increases of carrot and onion similar to those obtained with dd (300 liters/ha) and aldicarb (10 kg a.i./ha). populati ... | 1986 | 19294191 |
| description of meloidogyne christiei n. sp. (nematoda: meloidogynidae) from oak with sem and host-range observations. | meloidogyne christiei n. sp. is described and illustrated from turkey oak (quercus laevis) in sanlando park, altamonte springs, florida. this new nematode species has a distinctive perineal pattern commonly with a high, squarish arch and coarse broken striae which tend to diverge at various angles, especially in and above the anal area. female labial disc is indented, forming four points or prongs, unlike other species. eggs are deposited inside the gall in a tubular, coiled manner. vaginal musc ... | 1986 | 19294223 |
| differential reaction of alfalfa cultivars to meloidogyne hapla and m. chitwoodi populations. | meloidogyne hapla reproduced and suppressed growth (p < 0.05) of susceptible lahontan and moapa alfalfa at 15, 20, and 25 c. at 30 c, resistant nevada syn xx lost resistance to m. hapla. m. hapla invaded and reproduced on rhizobium meliloti nodules of lahontan and moapa, inducing giant cell formation and structural disorder of vascular bundles of nodules without disrupting bacteroids. at 15, 20, and 25 c a m. chitwoodi population from utah reproduced on lahontan, moapa, and nevada syn xx alfalfa ... | 1986 | 19294189 |
| effects of heterodera glycines and meloidogyne incognita on early growth of soybean. | greenhouse and field microplot studies were conducted to compare soybean shoot and root growth responses to root penetration by heterodera glycines (hg) and meloidogyne incognita (mi) individually and in combination. soybean cultivars centennial (resistant to hg and mi), braxton (resistant to mi, susceptible to hg), and coker 237 (susceptible to hg and mi) were selected for study. in the greenhouse, pot size and number of plants per pot had no effect on hg or mi penetration of coker 237 roots; r ... | 1986 | 19294209 |
| effects of interactions among heterodera glycines, meloidogyne incognita, and host genotype on soybean yield and nematode population densities. | the effects of host genotype and initial nematode population densities (pi) on yield of soybean and soil population densities of heterodera glycines (hg) race 3 and meloidogyne incognita (mi) race 3 were studied in a greenhouse and field microplots in 1983 and 1984. centennial (resistant to hg and mi), braxton (resistant to mi, susceptible to hg), and coker 237 (susceptible to hg and mi) were planted in soil infested with 0, 31, or 124 eggs of hg and mi, individually and in all combinations, per ... | 1986 | 19294208 |