Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| host-parasite relationships of the root-knot nematode, heterodera marioni; some effects of the host on the parasite. | 1946 | 21027516 | |
| the relative susceptibility of 41 sweetpotato varieties, introductions, and seedlings to the root-knot nematode, heterodera marioni (cornu) goodey. | 1947 | 20296033 | |
| notes on the physiology of meloidogyne javanica (treub, 1885), nematoda: heteroderidae. | 1951 | 14825030 | |
| meloidogyne acronea, a new species of root-knot nematode. | 1956 | 13321999 | |
| influence of soil oxygen concentrations on the development of meloidogyne javanica. | roots of tomato plants infected with meloidogyne javanica were grown in soil subjected to oxygen concentrations of 21 percent, 5.5 percent, 3.5 percent, 2.0 percent, 0.6 percent, and 0 percent for 28 and 35 days. the lowest oxygen tension which still allowed development of the host and the nematode was 3.5 percent. below this level the plant root growth, size of developing females, and production of nematode eggs were reduced. nematode activity as measured bythe number of nematode galls on the r ... | 1961 | 17731377 |
| a british root-knot nematode, meloidogyne artiellia n.sp. | 1961 | 13701441 | |
| polyploidy and parthenogenesis in the root-knot nematode meloidogyne arenaria. | 1963 | 14079604 | |
| serological studies on the plant parasitic nematode, meloidogyne javanica. | 1964 | 14201366 | |
| nematode-trapping fungi: evaluation of axenic healthy and galled roots as trap inducers. | larvae of meloidogyne hapla chit. induced abundant trap formation in the predaceous fungus arthrobotrys conoides drechs. under similar aseptic conditions, neither healthy roots of lycopersicon esculentum mill, nor roots parasitized by the root-knot nematode induced traps. | 1964 | 14190248 |
| host-parasite interaction in root-knot nematode-infected carrot tissue. | 1965 | 14288718 | |
| polyploidy and reproductive patterns in the root-knot nematode meloidogyne hapla. | 1966 | 5927453 | |
| changes associated with parasitism in nematodes. ii. histochemical and microspectrophotometric analyses of preparasitic and parasitic larvae of meloidogyne javanica. | 1967 | 4294954 | |
| activity of dehydrogenases in tomato root-knots infected with the root-knot nematode. | 1967 | 5583868 | |
| changes associated with parasitism in nematodes. i. morphology and physiology of preparasitic and parasitic larvae of meloidogyne javanica. | 1967 | 5340778 | |
| supply of oxygen during hatching of the nematode meloidogyne javanica under non-competitive conditions. | 1968 | 5689347 | |
| pathogenicity of four species of meloidogyne on three varieties of olive trees. | 'ascolano' and 'sevillano' olive trees, olea europaea l., were highly susceptible to meloidogyne javanica (trueb) chitwood, and growth of their tops was decreased greatly in tests in a glasshouse. roots of 'manzanillo' olive trees were galled moderately by m. javanica, and their tops weighed 6% less than those of noninoculated trees. 'manzanillo' olive is considered highly tolerant to m. javanica. 'ascolano' and 'manzanillo' olive trees were highly susceptible to m. incognita (kofoid &white) chi ... | 1969 | 19325664 |
| wall modifications in developing giant cells of vicia faba and cucumis sativus induced by root knot nematode, meloidogyne javanica. | 1969 | 5799564 | |
| the hypersensitivity reaction of tomatoes resistant to meloidogyne incognita: reversal by cytokinins. | initiation of larval growth, induction of cell necrosis, and gall formation in the host were measured as criteria of resistance or susceptibility of tomato seedlings to the root-knot nematode, meloidogyne incognita (kofoid &white) chitwood. seedlings grown at 27 c on water agar containing additions were scored 3 or 4 days after infection.in the absence of exogenous plant growth regulatory substances, approximately 73% of larvae that entered roots of susceptible plants showed growth, none induced ... | 1969 | 19325655 |
| the histochemical localization of several enzymes of soybeans infected with the root-knot nematode meloidogyne incognita acrita. | the sites of activity of alkaline phosphatase, acid phosphatase, esterase, peroxidase, adenosine triphosphatase, and cytochrome oxidase were demonstrated histochemically in fresh sections of 'lee' soybeans infected by the root-knot nematode meloidogyne incognita acrita. each of the six enzymes was more active at the sites of infection than in adjacent non-infected tissue. during the early stages of infection, an increase in enzyme activity was observed in several cells in the proximity of the li ... | 1969 | 19325688 |
| effect of meloidogyne incognita, m. hapla, and m. javanica on the severity of fusarium wilt of chrysanthemum. | rooted cuttings of chrysanthemum morifolium 'yellow delaware' (fusarium-susceptible) and 'white iceberg' (fusarium-resistant) were greenhouse-grown in: (i) non-infested soil; (ii) soil infested with fusarium oxysporum alone; (iii) soil infested with meloidogyne incognita, m. javanica or m. hapla; and (iv) each nematode separately plus the fungus. all nematode species infected roots of both cultivars and caused characteristic root-knot symptoms but did not appreciably affect growth meassured by p ... | 1969 | 19325666 |
| interrelationships between root-nodule bacteria, plant-parasitic nematodes and their leguminous host. | the effect of infection by meloidogyne javanica and heterodera trifolii on number, size, structure and efficiency of nodules formed by rhizobiurn trifolii on white clover roots was investigated. introduction of nematodes one week before, simultaneously, or one week following inoculation with rhizobium bacteria did not hinder nodule formation. nodule size did not differ between nematode-infected and nematode-free plants. formation of nodules on m. javanica galls and gall formation on the nodules ... | 1969 | 19325677 |
| interactions between meloidogyne incognita, m. hapla, and pratylenchus brachyurus in tobacco. | in a greenhouse pot experiment on the pathogenicity and interactions of meloidogyne incognita, m. hapla and pratylenchus brachyurus on four cultivars o f tobacco the cultivars 'hicks' and 'nc 2326' were susceptible to each nematode and "nc 95' and 'nc 2512' resistant only to m. incognita.mean heights of susceptible plants were depressed but fresh weight of tops did not differ significantly. meloidogyne spp. increased fresh weight of susceptible (but not the resistant) roots.reproduction of m. in ... | 1970 | 19322321 |
| comparative disc-electrophoretic protein analyses of selected meloidogyne, ditylenchus, heterodera and aphelenchus spp. | disc-electrophoretic separation of soluble proteins from whole nematode homogenates yielded band profiles useful for distinguishing selected species of meloidogyne and ditylenchus, and the genera heterodera, and aphelenchus. certain protein bands were common to all the species of meloidogyne, whereas other bands were specific. meloidogyne spp. and heterodera glycines shared some protein similarities, but other genera differed distinctly. protein profiles of meloidogyne spp. were not significantl ... | 1970 | 19322314 |
| resistance of cucumis spp. to the root-knot nematode, meloidogyne incognita acrita. | the nature of resistance in cucumis ficifolius and c. metuliferus to the root-knot nematode, meloidogyne incognita acrita, was studied under greenhouse conditions. although as many larvae penetrated the roots of these species as those of the susceptible c. melo, few developed to the adult female stage. resistance in c. ficifolius and c. metuliferus was associated with hindrance of larval development beyond the second stage, delayed development of larvae to adults and stimulation toward maleness. ... | 1970 | 19322292 |
| symptomless resistance of alfalfa to meloidogyne incognita acrita. | penetration, development and migration of the cotton root-knot nematode, meloidogyne incognita acrita, in resistant and susceptible alfalfa varieties was compared. larvae entered both resistant and susceptible plants in approximately the same numbers. after 3 to 4 days, the number of larvae in resistant roots decreased sharply until at 7 days fewer than 5 larvae/seedling and no nematode development could be found. in susceptible roots, larvae became sedentary and developed normally; egg producti ... | 1970 | 19322284 |
| histopathogenesis of galls induced by meloidogyne naasi in wheat roots. | histopathogenesis of galls induced by meloidogyne naasi in wheat roots was studied. large numbers of larvae penetrated wheat root tips within 24 hr; larvae migrated both inter- and intracellularly, causing cortical hypertrophy. giant cells were formed in the stele around the head of each nematode within 4 to 5 days. initial pathological alterations in giant cell formation consisted of hypertrophy of protophloem and protoxylem cells, their nuclei and nucleoli. giant ceils contained 2 to 8 agglome ... | 1970 | 19322304 |
| pathogenicity of four root-knot nematode species to polianthes tuberosa. | 1970 | 19322296 | |
| influence of six varieties of cynodon on four meloidogyne spp. | two years of giant star grass, cynodon nlemluensis var. nlemfuensis, in a field plot markedly reduced the incidence of the root-knot nematodes. tomato planted following the grass showed very little or no root galling and the yield was thrice that of tomato planted on an adjacent field plot previously cropped to tomato. replicated greenhouse experiments indicated that six varieties of cynodon were resistant to root-knot nematode but it took up to 6 months of grass growth to appreciably lower the ... | 1971 | 19322377 |
| interaction of meloidogyne javanica and macrophomina phaseoli in kenaf root rot. | incidence and severity of root-rot caused by the fungus macrophomina phaseoli was increased in screenhouse-grown kenaf (hibiscus cannabinus l.) seedlings simultaneously infected by the nematode meloidogyne javanica. in seedlings inoculated at 5, 10 and 15 days of age, root rot lesions increased 70.3, 44.1 and 21.8%, and nematode penetration increased 49.0, 36.7, and 12.3% when both fungus and nematode were present. | 1971 | 19322338 |
| the rhizoctonia-meloidogyne disease complex in flue-cured tobacco. | if meloidogyne incognita preceded rhizoctonia solani by 10 days or 21 days in roots of greenhouse-grown tobacco plants, root rot was more extensive than when the nematode and fungus were introduced either simultaneously or separately or when r. solani was added after artificial wounding. histological examination of galled roots 72 days after inoculation with r. solani revealed extensive fungal colonization in the root-knot susceptible cultivar 'dixie bright 101' when m. incognita preceded r. sol ... | 1971 | 19322362 |
| nematodes parasitic on forest trees: iii. reproduction on selected hardwoods. | the host-parasite relationships of 13 species of plant parasitic nematodes and five species of hardwoods native to the southeastern united states were tested on greenhouse-grown tree seedlings for 6-10 months. criteria for parasitism were completion o f life cycle and population increase of nematodes. belonolaimus longicaudatus, helicotylenchus dihystera, scutellonema brachyurum and tylenchorhynchus claytoni parasitized and reproduced on three or more of the species tested. hoplolaimus galeatus ... | 1971 | 19322363 |
| control of the root-knot nematode, meloidogyne incognita, on mimosa (albizzia julibrissin) by chemical dips. | 1972 | 19319246 | |
| the relationship between tobacco yield and time of infection with meloidogyne javanica. | yield of tobacco was related to the amount of infection by meloidogyne javanica during the first month after transplanting. six nematicidal treatments significantly reduced infection during this period and subsequently increased yield. however, during the second month after transplanting, infection in plots treated with o-ethyl s,s-dipropyl phosphorodithioate (v-c 9-104) and a mixture of 80% chlorinated c hydrocarbons + 20% methyl isothioeyanate (dd + mencs) was not significantly different from ... | 1972 | 19319250 |
| interaction of meloidogyne naasi, pratylenchus penetrans, and tylenchorhynchus agri on creeping beentgrass. | the pathogenicity and interactions of meloidogyne naasi, pratylenchus penetrans, and tylenchorhynchus agri on 'toronto c-15' creeping bentgrass, agrostis palustris, was studied in a long-term greenhouse experiment. based on dry weights of roots and clippings, m. naasi alone and in all combinations with p. penetrans and t. agri was highly pathogenic to creeping bentgrass. p. penetrans and t. agri alone and in combination inhibited root growth but adversely affected top growth only when the two we ... | 1972 | 19319260 |
| serological relationship of meloidogyne incognita and m. arenaria. | eight to ten precipitin bands were formed in a double immunodiffusion system comparing antigens of adult females of meloidogyne incognita and m. arenaria. most of the precipitin bands, based on band position and coalescence, were common to both species. antiserum specific for m. incognita was prepared by cross absorption. two populations of m. incognita were serologically identical, whereas two populations of m. arenaria differed slightly with respect to one weak precipitin band. | 1972 | 19319255 |
| influence of temperature on embryogenesis in meloidogyne javanica. | the optimum temperature for embryogenesis in meloidogyne javanica lies between 25 and 30 c. embryogenesis is slightly more rapid at 30 c (9-10 days), but more eggs complete development at 25 c (11-13 days). at temperatures of 25, 27.5, and 30 c, embryogenesis is about twice as rapid as at 20 c (23-25 days), and about four times as rapid as at 15 c (46-48 days). time-lapse studies showed that the thermal optimum is similar throughout the different stages of embryonic development. | 1972 | 19319268 |
| changes in the ultrastructure of the gelatinous matrix of meloidogyne javanica during dehydration. | the fine structure of the gelatinous matrix of meloidogyne javanica in both moist and dry states was studied by means of chemical fixation and thin sectioning techniques and the freeze-etch method. the matrix consists of an irregular meshwork when hydrated and a uniform granular mass of much greater density when dehydrated. the spaces in the hydrated meshwork are presumed to contain water. the change from a hydrated to a dehydrated state is accompanied by an overall shrinkage and hardening of th ... | 1972 | 19319261 |
| races of the barley root-knot nematode, meloidogyne naasi. iii. reproduction and pathogenicity on creeping bentgrass. | reproduction and pathogenicity of the five known races of meloidogyne naasi on two selections of creeping bentgrass were compared. toronto c-15 was a host for races 3, 4 and 5, whereas northmoor 9 supported reproduction of all five races. differences in susceptibility and population increase demonstrated that the races could be separated by degree of reproduction on the two selections. root weights generally were unaffected. based on cumulative dipping weights, all but race 1 were pathogenic on ... | 1973 | 19319296 |
| races of the barley root-knot nematode, meloidogyne naasi. ii. developmental rates. | the developmental rates of the five newly designated races of meloidogyne naasi were compared on barley, oat and sorghum. races 1, 2, 3 and 4 developed and reproduced on both barley and oat but not on sorghum. race 5 developed and reproduced readily on sorghum but poorly on oat. a more rapid rate of development of race 5 on both barley and sorghum than that of other races on barley demonstrated that race 5 has a shorter life cycle than do races 1-4. | 1973 | 19319295 |
| races of the barley root-knot nematode, meloidogyne naasi. i. characterization by host preference. | the host preferences of populations of meloidogyne naasi from england, california, illinois, kentucky and kansas were compared. among 22 plant species tested, most were hosts for isolates of all five populations; crabgrass was added to the list of known hosts. differential reactions of isolates on creeping bentgrass, curly dock, sorghum, and common chickweed demonstrated the existence of at least five physiological races within m. naasi. the known races are numerically designated and characteriz ... | 1973 | 19319294 |
| effects of meloidogyne javanica and incognita on the amino acid and reducing sugar content of certain soybean varieties. | 1973 | 4740805 | |
| efficacy of 1,2-dibromo-3-chloropropane for control of meloidogyne javanica as influenced by concentration, exposure time and rate of degradation. | laboratory experiments were conducted by applying 1,2-dibromo-3-chloropropane (dbcp) to sealed vials of soil infested with meloidogyne javanica. a minimum initial concentration of 0.25 mug of dbcp/g of oven-dry soil killed all nematodes within 35 days. a concentration of 1.0 mug/g killed all nematodes within 28 days. the rate of degradation of this chemical was determined by treatment of steamed and nonsteamed dry soil in open and sealed vials. extraction of tile chemical, followed by quantifica ... | 1973 | 19319345 |
| the effects of soil salinity and meloidogyne javanica on tomato. | a non-sodic, non-saline sandy loam soil was salinized to anion-cation ratios similar to those naturally occurring in iraq and california. the interactions of saline soils (conductivities 4, 8, 12 and 16 mmhos/cm) with a moderately salt-tolerant plant (lycopersicon esculentum 'marimond') and a plant parasitic nematode (meloidogyne javanica) were investigated. plant parasitic nematodes were shown to be an important modifying influence within the plant environment, either accentuating or ameliorati ... | 1973 | 19319341 |
| economics of root-knot nematode control on cotton by dbcp fumigant on the texas high plains. | 1973 | 19319302 | |
| theratromyxa weberi, an amoeba predatory on plant-parasitic nematodes. | theratromyxa weberi, an amoeba, was isolated and cultured in the laboratory to determine the physical conditions that influence its predation on plant parasitic nematodes. in greenhouse tests, the amoeba was a poor biological control agent of the root-knot nematode, meloidogyne incognita. | 1973 | 19319347 |
| hatching of meloidogyne incognita eggs in the neutral carbohydrate fraction of root exudates of gnotobiotically grown alfalfa. | meloidogyne incognita eggs were hatched in soil sterilized by gamma kradiation and wetted with root exudates from alfalfa plants in different stages of development and subjected to various levels of clipping. carbohydrate components of the exudates were identified by gas chromatography-mass spectrometry. although significant stimulation of hatch was detected in exudates of seedling and flowering plants, the practical importance of the increase is doubtful as hatch in distilled water was always g ... | 1973 | 19319320 |
| fine structure of cephalic sense organs in meloidogyne incognita males. | amphids, and the cephalic and labial papillae of meloidogyne incognita males were examined in detail by electron microscopy. each amphid basically consists of an amphidial gland, a nerve bundle and an amphidial duct. the gland is a broad microvillous organ with a narrow anterior process, which is closely associated with the amphidial duct. a posterior process of the gland contains secretory organelles and proceeds along the esophagus with the lateral cephalic nerve bundle. the nerve bundle penet ... | 1973 | 19319352 |
| resistance to meloidogyne hapla in peanut. | two hundred thirty-five cultivated varieties, breeding lines and plant introductions of arachis hypogaea and 12 accessions of wild arachis spp. were tested for resistance to meloidogyne hapla. eight of the cultivated peanut lines were only moderately susceptible and four of the wild peanuts exhibited resistance. no resistance-breaking m. hapla populations were found among 10 geographical isolates tested. | 1973 | 19319351 |
| effect of temperature on growth, development and reproduction of meloidogyne hapla in lettuce. | temperature was an important factor in growth, development and reproduction of meloidogyne hapla in lettuce. growth, as measured by increase in diameter of females, was not appreciably different at the intermediate (21.1 c night and 26.7 c day) and high (26.7 c night and 32.2 c day) temperature regimes, but was considerably less at the low temperature regime (15.5 c night and 21.1 c day) than at the two higher temperature regimes. second-stage female larvae developed into adults 14 days after in ... | 1973 | 19319319 |
| pathogenicity of meloidogyne hapla to lettuce as affected by inoculum level, plant age at inoculation and temperature. | pathogenicity of meloidogyne hapla to lettuce was influenced by inoculum level, age of plant at inoculation and temperature. top weight of 'minetto' lettuce was reduced 32% when 2-week-old lettuce plants were each inoculated with five egg masses. higher inoculum levels did not further decrease top weight significantly. inoculation at seeding reduced top growth more than inoculation of 1-, 2- or 3-week-old seedlings. m. hapla reduced growth more at the intermediate (21.1 c night and 26.7 c day), ... | 1973 | 19319317 |
| phenol accumulation related to resistance in tomato to infection by root-knot and lesion nematodes. | host-parasite relationships of meloidogyne incognita acrita and pratylenchus penetrans were compared on three closely related cultivars of tomato: 'nemared', resistant to root-knot nematodes; 'hawaii 7153', moderately resistant; and 'b-5', susceptible. root-knot nematode larvae induced typical galls on the roots of b-5; larvae that entered nemared were walled-off by necrotic cells; both reactions occurred in hawaii 7153. lesion nematodes caused surface lesions which were initially similar on all ... | 1973 | 19319346 |
| relative efficacy of selected volatile and nonvolatile nematicides for control of meloidogyne incognita on tobacco. | root-knot nematode control and tobacco yields in plots infested with meloidogyne incognita and treated with the nonvolatile nematicides, aldicarb, mocap (r), or nemacur (r) were greater than those on similar plots treated with volatile nematicides such as dd, dd + mencs, sd14647 or tetrachlorothiophene. root-knot control and tobacco yields in plots treated with carbofuran or dasanit (r) were eqtual to that obtained with dd + mencs, but less than that obtained with the other volatile soil nematic ... | 1973 | 19319289 |
| correlation of tobacco yield, value, and root-knot index with early-to-midseason, and postharvest meloidogyne population densities. | certain nematicidal treatments for the control of root knot of tobacco in six field experiments in north carolina were used to determine early, midseason, and postharvest densities of eggs and larvae of meloidogyne spp., postharvest root-knot indices, and crop yield and value. various statistical correlations showed that population densities determined 6-8 wk after transplanting were more indicative of treatment effectiveness than postharvest densities. logarithmic transformation of early and mi ... | 1974 | 19319371 |
| resistance of cotton to the root-knot nematode, meloidogyne incognita. | cotton plants resistant to meloidogyne incognita had roots characterized by fewer and smaller galls, and females that produced fewer egg masses containing fewer eggs than did susceptible plants. many galls on resistant roots contained no nematodes at the time of examination. penetration of the resistant cultivar was equal to that of the susceptible cultivar and independent of the number of nematodes in the inoculum. fewer nematodes penetrated resistant or susceptible plants with eight leaves tha ... | 1974 | 19319358 |
| water uptake and hatching in the potato cyst nematode, heterodera rostochiensis, and the root knot nematode, meloidogyne incognita. | 1974 | 4475089 | |
| an electron microscopic study of glycogen and lipid in female meloidogyne incognita (root-knot nematode). | 1974 | 4436740 | |
| suppression of embryogenesis and hatching in meloidogyne javanica by thermal stress. | embryogenes is and hatching of eggs of meloidogyne javanica were suppressed by brief heat treatment (46 c for 10 min). the period of suppression or arrested development differs according to the stage of development of the nematode when heat treatment is applied. the effect on hatching is much more pronounced than on embryogenesis. | 1974 | 19319374 |
| 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 |
| free amino acids in roots of infected cotton seedlings resistant and susceptible to meloidogyne incognita. | quantities of free amino acids in segments of cotton roots resistant and susceptible to meloidogyne incognita were compared. following infection, the root-knot susceptible cultivar, m8, had greater percentage increases of certain individual free amino acids than the resistant cultivar, clevewilt, but the sum total of free amino acids was greatest in the resistant cultivar. more free amino acids were present in infected than in noninfected plants of both cultivars. the overall concn of glycine de ... | 1975 | 19308129 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| ultrastructure of a neurosensory organ in a root-knot nematode. | 1976 | 957473 | |
| 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 |
| 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 | |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 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 |
| 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 |
| 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 |
| 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 | |
| effects of aldicarb on fusarium wilt-root-knot nematode disease of cotton. | 1978 | 19305871 | |
| 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 |
| 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 |
| 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 |