Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| reproduction of meloidogyne incognita on winter cover crops used in cotton production. | substantial reproduction of meloidogyne incognita on winter cover crops may lead to damaging populations in a subsequent cotton (gossypium hirsutum) crop. the amount of population increase during the winter depends on soil temperature and the host status of the cover crop. our objectives were to quantify m. incognita race 3 reproduction on rye (secale cereale) and several leguminous cover crops and to determine if these cover crops increase population densities of m. incognita and subsequent dam ... | 2006 | 19259434 |
| dynamics of meloidogyne incognita virulence to resistance genes rk and rk in cowpea. | the virulence index of three meloidogyne incognita field isolates to the resistance gene rk in cowpea was 0%, 75%, and 120%, with the index measured as reproduction on resistant plants as a percentage of the reproduction on susceptible plants. continuous culture of the 75% virulent isolate on susceptible tomato for more than 5 years (about 25 generations) resulted in virulence decline to about 4%. the rate of the decline in virulence was described by exponential decay, indicating the progressive ... | 2006 | 19259435 |
| a method for generating meloidogyne incognita males. | a method for producing mass quantities of meloidogyne incognita males free from other developmental stages was developed. host plants were grown hydroponically to facilitate nematode harvest. pruning stress was shown to cause a higher percentage of juveniles to develop as males vs. a no-stress control. application of pruning stress in the first 48 hr post-inoculation was also shown to be more effective at driving male development than at later times. | 2006 | 19259447 |
| sensitivity of meloidogyne incognita and rotylenchulus reniformis to abamectin. | avermectins are macrocyclic lactones produced by streptomyces avermitilis. abamectin is a blend of b(1a) and b(1b) avermectins that is being used as a seed treatment to control plant-parasitic nematodes on cotton and some vegetable crops. no ld(50) values, data on nematode recovery following brief exposure, or effects of sublethal concentrations on infectivity of the plant-parasitic nematodes meloidogyne incognita or rotylenchulus reniformis are available. using an assay of nematode mobility, ld ... | 2006 | 19259453 |
| efficacy of a novel nematicidal seed treatment against meloidogyne incognita on cotton. | the efficacy of abamectin as a seed treatment for control of meloidogyne incognita on cotton was evaluated in greenhouse, microplot, and field trials in 2002 and 2003. treatments ranging from 0 to 100 g abamectin/100 kg seed were evaluated. in greenhouse tests 35 d after planting (dap), plants from seed treated with abamectin were taller than plants from nontreated seed, and root galling severity and nematode reproduction were lower where treated seed were used. the number of second stage juveni ... | 2006 | 19259454 |
| phenotypic expression of rkn1-mediated meloidogyne incognita resistance in gossypium hirsutum populations. | the root-knot nematode meloidogyne incognita is a damaging pest of cotton (gossypium hirsutum) worldwide. a major gene (rkn1) conferring resistance to m. incognita was previously identified on linkage group a03 in g. hirsutum cv. acala nemx. to determine the patterns of segregation and phenotypic expression of rkn1, f(1), f(2), f(2:3), bc(1)f(1) and f(2:7) recombinant inbred lines (ril) from intraspecific crosses between acala nemx and a closely related susceptible cultivar acala sj-2 were inocu ... | 2006 | 19259455 |
| potential for site-specific management of meloidogyne incognita in cotton using soil textural zones. | the effect of various edaphic factors on meloidogyne incognita population densities and cotton yield were evaluated from 2001 to 2003 in a commercial cotton field in southeastern arkansas. the 6.07-ha field was subdivided into 512 plots (30.5 m x 3.9 m), and each plot was sampled for m. incognita prior to fumigation (ppre), at planting (pi), at peak bloom (pm) and at harvest (pf) each year. soil texture (percent sand fraction) and the pre-plant soil fertility levels each year were determined fro ... | 2007 | 19259468 |
| cotton root protection from plant-parasitic nematodes by abamectin-treated seed. | abamectin is nematicidal to meloidogyne incognita and rotylenchulus reniformis, but the duration and length of cotton taproot protection from nematode infection by abamectin-treated seed is unknown. based on the position of initial root-gall formation along the developing taproot from 21 to 35 d after planting, infection by m. incognita was reduced by abamectin seed treatment. penetration of developing taproots by both nematode species was suppressed at taproot length of 5 cm by abamectin-treate ... | 2007 | 19259471 |
| virulence of meloidogyne spp. and induced resistance in grape rootstocks. | harmony grape rootstock displays resistance to several meloidogyne spp. but that resistance is not durable in commercial vineyard settings. a 2-year experiment in a microplot setting revealed host specificities of two virulent populations of meloidogyne arenaria and an avirulent population of meloidogyne incognita. in a subsequent split-root experiment, the avirulent nematode population was demonstrated to induce resistance to the virulent nematode population. to quantify the level of resistance ... | 2007 | 19259475 |
| variability in reproduction of four populations of meloidogyne incognita on six cultivars of cotton. | a range of virulence levels was found in four populations of meloidogyne incognita collected from cotton fields of the punjab region of pakistan. the most virulent population was associated with development of larger gall size, larger giant cell formation and improved success of juveniles transitioning into reproducing adults. the most virulent nematode population, mi-78, emanated from cotton cultivar niab-78. this cotton cultivar also possessed the greatest level of resistance to the three othe ... | 2007 | 19259478 |
| effect of broccoli (brassica oleracea) tissue, incorporated at different depths in a soil column, on meloidogyne incognita. | brassicas have been used frequently for biofumigation, a pest-management strategy based on the release of biocidal volatiles during decomposition of soil-incorporated tissue. however, the role of such volatiles in control of plant-parasitic nematodes is unclear. the goal of this study was to determine the direct localized and indirect volatile effects of amending soil with broccoli tissue on root-knot nematode populations. meloidogyne incognita-infested soil in 50-cm-long tubes was amended with ... | 2007 | 19259479 |
| the future of nematode management in cotton. | the importance of plant-parasitic nematodes as yield-limiting pathogens of cotton has received increased recognition and attention in the united states in the recent past. this paper summarizes the remarks made during a symposium of the same title that was held in july 2007 at the joint meeting of the society of nematologists and the american phytopathological society in san diego, california. although several cultural practices, including crop rotation, can be effective in suppressing the popul ... | 2007 | 19259500 |
| exposure time to lethal temperatures for meloidogyne incognita suppression and its implication for soil solarization. | meloidogyne incognita eggs or j2 were incubated in test tubes containing sand:peat mix and immersed in a water bath heated to 38, 39, 40, 41, 42, 43, 44 and 45 degrees c for a series of time intervals. controls were maintained at 22 degrees c. nematodes surviving or hatching were collected from baermann trays after three weeks of incubation. regression analyses between percent survival or egg hatch and hours of heat treatment were performed for each temperature. complete suppression of egg hatch ... | 2008 | 19259512 |
| characterization of root-knot nematode resistance in medicago truncatula. | root knot (meloidogyne spp.) and cyst (heterodera and globodera spp.) nematodes infect all important crop species, and the annual economic loss due to these pathogens exceeds $90 billion. we screened the worldwide accession collection with the root-knot nematodes meloidogyne incognita, m. arenaria and m. hapla, soybean cyst nematode (scn-heterodera glycines), sugar beet cyst nematode (sbcn-heterodera schachtii) and clover cyst nematode (clcn-heterodera trifolii), revealing resistant and suscepti ... | 2008 | 19259519 |
| nutsedge counts predict meloidogyne incognita juvenile counts in an integrated management system. | the southern root-knot nematode (meloidogyne incognita), yellow nutsedge (cyperus esculentus) and purple nutsedge (cyperus rotundus) are important pests in crops grown in the southern us. management of the individual pests rather than the pest complex is often unsuccessful due to mutually beneficial pest interactions. in an integrated pest management scheme using alfalfa to suppress nutsedges and m. incognita, we evaluated quadratic polynomial regression models for prediction of the number of m. ... | 2008 | 19259526 |
| detection and investigation of soil biological activity against meloidogyne incognita. | greenhouse experiments with two susceptible hosts of meloidogyne incognita, a dwarf tomato and wheat, led to the identification of a soil in which the root-knot nematode population was reduced 5- to 16-fold compared to identical but pasteurized soil two months after infestation with 280 m. incognita j2/100 cm(3) soil. this suppressive soil was subjected to various temperature, fumigation and dilution treatments, planted with tomato, and infested with 1,000 eggs of m. incognita/100 cm(3) soil. ei ... | 2008 | 19259527 |
| effect of a terminated cover crop and aldicarb on cotton yield and meloidogyne incognita population density. | terminated small grain cover crops are valuable in light textured soils to reduce wind and rain erosion and for protection of young cotton seedlings. a three-year study was conducted to determine the impact of terminated small grain winter cover crops, which are hosts for meloidogyne incognita, on cotton yield, root galling and nematode midseason population density. the small plot test consisted of the cover treatment as the main plots (winter fallow, oats, rye and wheat) and rate of aldicarb ap ... | 2008 | 19259531 |
| plantago lanceolata and plantago rugelii extracts are toxic to meloidogyne incognita but not to certain microbes. | extracts from the plants plantago lanceolata and p. rugelii were evaluated for toxicity to the root-knot nematode meloidogyne incognita, the beneficial microbes enterobacter cloacae, pseudomonas fluorescens and trichoderma virens, and the plant-pathogenic fungi fusarium oxysporum f. sp. gladioli, phytophthora capsici, pythium ultimum, and rhizoctonia solani. wild plants were collected, roots were excised from shoots, and the plant parts were dried and ground to a powder. one set of extracts (10% ... | 2006 | 19259537 |
| expression and regulation of the arabidopsis thaliana cel1 endo 1,4 beta glucanase gene during compatible plant-nematode interactions. | the root-knot nematode meloidogyne incognita is an obligate endoparasite of plant roots and stimulates elaborate modifications of selected root vascular cells to form giant cells for feeding. an arabidopsis thaliana endoglucanase (atcel1) promoter is activated in giant cells that were formed in atcel1::uida transgenic tobacco and arabidopsis plants. activity of the full-length atcel1 promoter was detected in root and shoot elongation zones and in the lateral root primordia. different 5' and inte ... | 2006 | 19259541 |
| the comparative cellular architecture of the female gonoduct among tylenchoidea (nematoda: tylenchina). | the cellular architecture of the female gonoduct of 68 nematode populations representing 42 species belonging to tylenchidae, belonolaimidae, hoplolaimidae and meloinema is shown to have an overall similarity in cellular gonoduct structure. the oviduct consists of two rows of four cells; the spermatheca is comprised of 10 to 20 cells, and the uterus cells, except in the case of psilenchus, are arranged in four (tylenchidae) or three (belonolaimidae, hoplolaimidae and meloinema) regular rows. alt ... | 2006 | 19259542 |
| effect of crotalaria juncea amendment on nematode communities in soil with different agricultural histories. | effect of sunn hemp (crotalaria juncea) hay amendment on nematode community structure in the soil surrounding roots of yellow squash (cucurbita pepo) infected with root-knot nematodes was examined in two greenhouse experiments. soils were from field plots treated long-term (lt) with yard-waste compost or no yard-waste compost in lt experiment, and from a short-term (st) agricultural site in st experiment. soils collected were either amended or not amended with c. juncea hay. nematode communities ... | 2003 | 19262764 |
| induction of tolerance to root-knot nematode by oxycom. | oxycom applications increased plant growth and population levels of meloidogyne incognita on susceptible tomato. a single oxycom drench at 2,500 ppm applied 7 days prior to inoculation with m. incognita provided remediation of plant growth measured 63 days later. this occurred without reducing nematode population levels. follow-up drenches at 2,500 ppm at 10-day intervals stunted shoots and roots (p = 0.05). the same application rates at 20-day intervals did not reduce plant growth. plants recei ... | 2003 | 19262766 |
| relationships between tolerance and resistance to meloidogyne incognita in cotton. | the southern root-knot nematode, meloidogyne incognita, is the most damaging pathogen of cotton in the united states, and both resistance and tolerance to m. incognita could be valuable management approaches. our objectives were to evaluate advanced cotton breeding lines for resistance and tolerance to m. incognita and to determine if a relationship between resistance and tolerance exists. reproduction of m. incognita was evaluated on 17 breeding lines, a susceptible control (delta and pine land ... | 2003 | 19262772 |
| competition of meloidogyne incognita and rotylenchulus reniformis on cotton following separate and concomitant inoculations. | it has been hypothesized rotylenchulus reniformis (rr) has a competitive advantage over meloidogyne incognita (mi) in the southeastern cotton production region of the united states. this study examines the reproduction and development of meloidogyne incognita (mi) and rotylenchulus reniformis (rr) in separate and concomitant infections on cotton. under greenhouse conditions, cotton seedlings were inoculated simultaneously with juveniles (j2) of m. incognita and vermiform adults of r. reniformis ... | 2003 | 19262774 |
| evaluation of asteraceae plants for control of meloidogyne incognita. | of the 56 species and 43 genera of asteraceae tested, 9 were highly resistant or immune to meloidogyne incognita and did not form root galls. twenty-six species and six cultivars had 25% or fewer roots galled and were considered moderately resistant to m. incognita. pre-planting cosmos bipinnatus (f190), gaillardia pulchella, tagetes erecta, tithonia diversifolia, or zinnia elegans (f645) reduced root galling and m. incognita j2 in and around ipomoea reptans. amendment of soils with roots, stems ... | 2004 | 19262785 |
| reproduction of mi-virulent meloidogyne incognita isolates on lycopersicon spp. | selection of detectable numbers of mi-virulent root-knot nematodes has necessitated a greater understanding of nematode responses to new sources of resistance. during the course of this research, we compared the reproduction of four geographically distinct mi-virulent root-knot nematode isolates on three resistant accessions of lycopersicon peruvianum. each accession carried a different resistant gene, mi-3, mi-7, or mi-8. all nematode isolates were verified as meloidogyne incognita using diagno ... | 2004 | 19262789 |
| cyperus tubers protect meloidogyne incognita from 1,3-dichloropropene. | meloidogyne incognita-infected and noninfected tubers of yellow nutsedge (cyperus esculentus) and purple nutsedge (cyperus rotundus) were treated with 56 l/ha 1,3-dichloropropene (1,3-d) in microplots and subsequently examined for tuber and nematode viability in the greenhouse using a chile pepper (capsicum annuum) bioassay system. the study was conducted three times. nutsedge tuber viability and m. incognita harbored in both yellow and purple nutsedge tubers were unaffected by 1,3-d treatment. ... | 2004 | 19262797 |
| pepper rootstock graft compatibility and response to meloidogyne javanica and m. incognita. | resistance of pepper species (capsicum annuum, c. baccatum, c. chinense, c. chacoense, and c. frutescens), cultivars and accessions to the root-knot nematodes meloidogyne incognita race 2 and m. javanica, and their graft compatibility with commercial pepper varieties as rootstocks were evaluated in growth chamber and greenhouse experiments. most of the plants tested were highly resistant to m. javanica but susceptible to m. incognita. capsicum annuum ar-96023 and c. frutescens accessions as root ... | 2004 | 19262798 |
| effect of crotalaria juncea amendment on squash infected with meloidogyne incognita. | two greenhouse experiments were conducted to examine the effect of crotalaria juncea amendment on meloidogyne incognita population levels and growth of yellow squash (cucurbita pepo). in the first experiment, four soils with a long history of receiving yard waste compost (ywc+), no-yard-waste compost (ywc-), conventional tillage, or no-tillage treatments were used; in the second experiment, only one recently cultivated soil was used. half of the amount of each soil received air-dried residues of ... | 2004 | 19262819 |
| chemical-mediated toxicity of n-viro soil to heterodera glycines and meloidogyne incognita. | n-viro soil (nvs) is an alkaline-stabilized municipal biosolid that has been shown to lower population densities and reduce egg hatch of heterodera glycines and other plant-parasitic nematodes; but the mechanism(s) of nematode suppression of this soil amendment are unknown. this study sought to identify nvs-mediated changes in soil chemical properties and their impact upon h. glycines and meloidogyne incognita mortality. n-viro soil was applied to sand in laboratory assays at 0.5%, 1.0%, 2.0%, a ... | 2004 | 19262820 |
| effect of winter cover crops on nematode population levels in north florida. | two experiments were conducted in north-central florida to examine the effects of various winter cover crops on plant-parasitic nematode populations through time. in the first experiment, six winter cover crops were rotated with summer corn (zea mays), arranged in a randomized complete block design. the cover crops evaluated were wheat (triticum aestivum), rye (secale cereale), oat (avena sativa), lupine (lupinus angustifolius), hairy vetch (vicia villosa), and crimson clover (trifolium incarnat ... | 2004 | 19262833 |
| evaluation of several approaches to manage meloidogyne incognita and cotton seedling disease complexes in the high plains of texas. | field experiments were conducted for control of the southern root-knot nematode (meloidogyne incognita) and cotton seedling disease fungi (primarily thielaviopsis basicola) in one naturally infested field during 1999 and 2000 and in three additional fields in 2000. treatments included: seed-applied fungicides (triadimenol + mefenoxam + thiram and carboxin + pcnb + mefenoxam), cultivars (paymaster [pm] 2326 rr and pm 2200 rr), and a nematicide (aldicarb at 0.83 kg a.i/ha). plant stands were highe ... | 2005 | 19262844 |
| root-knot nematode problem of some winter ornamental plants and its biomanagement. | a microplot study under field conditions was carried out during 2 consecutive years to assess the effect of root-knot nematode infection (2,000 meloidogyne incognita eggs/kg soil) on three winter ornamental plants: hollyhock (althea rosea), petunia (petunia hybrida), and poppy (papaver rhoeas). effects of root-dip treatment with the biocontrol agents pochonia chlamydosporia, bacillus subtilis, and pseudomonas fluorescens and the nematicide fenamiphos were tested. the three ornamental species wer ... | 2005 | 19262861 |
| reproduction of belonolaimus longicaudatus, meloidogyne javanica, paratrichodorus minor, and pratylenchus brachyurus on pearl millet (pennisetum glaucum). | pearl millet (pennisetum glaucum) has potential as a grain crop for dryland crop production in the southeastern united states. whether or not pearl millet will be compatible in rotation with cotton (gossypium hirsutum), corn (zea mays), and peanut (arachis hypogaea) will depend, in part, on its host status for important plant-parasitic nematodes of these crops. the pearl millet hybrid 'tifgrain 102' is resistant to both meloidogyne incognita race 3 and m. arenaria race 1; however, its host statu ... | 2005 | 19262863 |
| factors affecting the suppression of heterodera glycines by n-viro soil. | previous laboratory research demonstrated that n-viro soil (nvs), an alkaline-stabilized municipal biosolid, suppressed plant-parasitic nematodes. this study continued to explore the use of nvs as a nematode management tool specifically addressing factors that could influence its use. n-viro soil from different locations, the components of nvs (de-watered biosolids and fly ash admixtures), and sterilized nvs were applied to sand microcosms to determine effects on nematode survival sand solution ... | 2005 | 19262864 |
| use of cucumis metuliferus as a rootstock for melon to manage meloidogyne incognita. | root-knot nematode-susceptible melons (cantaloupe) were grown in pots with varying levels of meloidogyne incognita and were compared to susceptible melons that were grafted onto cucumis metuliferus or cucurbita moschata rootstocks. in addition, the effect of using melons as transplants in nematode-infested soil was compared to direct seeding of melons in nematode-infested soil. there were no differences in shoot or root weight, or severity of root galling between transplanted and direct-seeded n ... | 2005 | 19262873 |
| variability of meloidogyne exigua on coffee in the zona da mata of minas gerais state, brazil. | minas gerais is the major coffee-producing state of brazil, with 28% of its production coming from the region of zona da mata. four major species of root-knot nematode attacking coffee (meloidogyne incognita, m. paranaensis, m. coffeicola, and m. exigua) have been reported from brazil. to determine the variability in meloidogyne spp. occurring in that region, 57 populations from 20 localities were evaluated for morphological, enzymatic, and physiological characteristics. according to the perinea ... | 2005 | 19262880 |
| isofemale line analysis of meloidogyne incognita virulence to cowpea resistance gene rk. | isofemale lines (ifl) from single egg masses were studied for genetic variation in meloidogyne incognita isolates avirulent and virulent to the resistance gene rk in cowpea (vigna unguiculata). in parental isolates cultured on susceptible and resistant cowpea, the virulent isolate contained 100% and the avirulent isolate 7% virulent lineages. virulence was selected from the avirulent isolate within eight generations on resistant cowpea (lineage selection). in addition, virulence was selected fro ... | 2005 | 19262890 |
| fitness of virulent meloidogyne incognita isolates on susceptible and resistant cowpea. | a study of life-history traits was made to determine factors associated with the fitness of meloidogyne incognita isolates virulent to resistance gene rk in cowpea. egg hatch, root penetration, egg mass production, and fecundity (eggs per egg mass) of avirulent and virulent phenotypes were compared among m. incognita isolates, isofemale lines, and single descent lines over multiple generations on resistant and susceptible cowpea. variation (p </= 0.05) in both hatch and root penetration rates wa ... | 2005 | 19262891 |
| effect of soils from six management systems on root-knot nematodes and plant growth in greenhouse assays. | the effects of soil management systems on root-knot nematode (meloidogyne incognita) eggs and gall incidence on tomato (lycopersicon esculentum) and cucumber (cucumis sativus) following tomato were evaluated. soil was collected from a replicated field experiment in which six management systems were being assessed for vegetable production. soil management systems were conventional production, organic production, bahiagrass (paspalum notatum) pasture, bahiagrass: stylosanthes (stylosanthes guianen ... | 2005 | 19262892 |
| effect of three plant residues and chicken manure used as biofumigants at three temperatures on meloidogyne incognita infestation of tomato in greenhouse experiments. | plant residues of broccoli, melon, and tomato with or without addition of chicken manure were used as biofumigants in two pot experiments with meloidogyne incognita-infested soils. the efficacy of these biofumigants in controlling m. incognita infestation in susceptible tomato bio-assay plants was studied at soil temperatures of 20 masculine, 25 masculine, and 30 masculinec. none of the plant residues was effective at 20 masculinec, and broccoli was more effective than tomato or melon at 25 masc ... | 2005 | 19262896 |
| a method for field infestation with meloidogyne incognita. | a field inoculation method was developed to produce meloidogyne spp. infestation sites with minimal quantities of nematode inoculum and with a reduced labor requirement compared to previous techniques. in a preseason-methyl bromidefumigated site, nematode egg suspensions were delivered at concentrations of 0 or 10(x) eggs/m of row where x = 2.12, 2.82, 3.52, or 4.22 through a drip line attached to the seed firmer of a commercial 2-row planter into the open seed furrow while planting cowpea. thes ... | 2005 | 19262898 |
| effect of sorghum-sudangrass and velvetbean cover crops on plant-parasitic nematodes associated with potato production in florida. | in a 3-year field study, population densities of belonolaimus longicaudatus and other plant-parasitic nematodes and crop yields were compared between potato (solanum tuberosum) cropping systems where either sorghum-sudangrass (sorghum bicolor x s. arundinaceum) or velvetbean (mucuna pruriens) was grown as a summer cover crop. population densities of b. longicaudatus, paratrichodorus minor, tylenchorhynchus sp., and mesocriconema sp. increased on sorghum-sudangrass. population densities of p. min ... | 2001 | 19265888 |
| efficacy of 1,3-dichloropropene in soil amended with compost and unamended soil. | 1,3-dichloropropene (1,3-d) is a likely alternative soil fumigant for methyl bromide. the objective was to determine root-knot nematode, meloidogyne incognita, survival in microplots after exposure to 1,3-d for various periods of time in soil that have previously been amended with compost. the treatments were 1,3-d applied broadcast at 112 liters/ha and untreated controls in both compost-amended and unamended soil. soil samples were collected from each microplot at 6, 24, 48, 72, and 96 hours af ... | 2001 | 19265889 |
| management of root-knot and reniform nematodes in ultra-narrow row cotton with 1,3-dichloropropene. | ultra-narrow row cotton studies were conducted during 1999 at two field sites in northern florida. one site was naturally infested with meloidogyne incognita race 3 and the other with rotylenchulus reniformis. the fumigant 1,3-dichloropropene (1,3-d) was applied broadcast at rates of 0, 16, 32, 48, 64, 80, and 96 kg ai./ha in replicated plots before planting delta pine 655 brr cotton in 25-cm-wide rows. post-harvest soil population densities at the root-knot nematode site had a significant (p </ ... | 2001 | 19265894 |
| crop rotation and nematicides for management of mixed populations of meloidogyne spp. on tobacco. | the effects of crop rotation and the nematicides 1,3-dichloropropene (1,3-d), ethoprop, and fenamiphos on the relative frequency of meloidogyne incognita race 3, m. arenaria race 2, and m. javanica and tobacco yields on a sandy loam soil were determined. cropping sequences altered the species composition and population densities of meloidogyne spp. meloidogyne arenaria and m. incognita predominated when cotton, corn, sorghum, or rye-fallow preceded tobacco. meloidogyne javanica and m. arenaria p ... | 2001 | 19265896 |
| meloidogyne incognita and m. arenaria reproduction on dwarf hollies and lantana. | meloidogyne incognita and m. arenaria reproduction and host plant tolerance were assessed in field and greenhouse experiments on seven holly cultivars including ilex glabra 'shamrock', i. vomitoria 'schelling's dwarf', i. cornuta 'carissa', red holly hybrid (ilex little red), and i. crenata 'compacta', 'green luster', and 'helleri' as well as japanese boxwood (buxus microphylla) and two lantana cultivars (lantana camara 'miss huff' and 'new gold'). boxwood had the highest m. arenaria and m. inco ... | 2001 | 19265898 |
| activation of a pollenin promoter upon nematode infection. | three glycine-rich protein genes of arabidopsis thaliana (atgrp-6, atgrp-7, and atgrp-8) that correspond to putative genes coding for pollenins (atolnb;2, atolnb;3, and atolnb;4, respectively) are expressed predominantly in the anthers and, more specifically, in the tapetum layer. tapetal cells are responsible for nutrition of developing pollen grains and show some functional similarities to nematode feeding sites (nfs) induced in plant roots by sedentary parasitic nematodes. the aim of this stu ... | 2002 | 19265912 |
| effects of site-specific application of aldicarb on cotton in a meloidogyne incognita-infested field. | cotton farmers in missouri commonly apply a single rate of aldicarb throughout the field at planting to protect their crop from meloidogyne incognita, even though these nematodes are spatially aggregated. our purpose was to determine the effect of site-specific application of aldicarb on cotton production in a field infested with these nematodes in 1997 and 1998. cotton yields were collected from sites not treated with aldicarb (control), sites receiving aldicarb at the standard recommended rate ... | 2002 | 19265917 |
| use of entomopathogenic nematodes to suppress meloidogyne incognita on greenhouse tomatoes. | tomato seedlings in a growth chamber were inoculated with 150 meloidogyne incognita eggs and 25 infective juveniles (ij)/cm² of steinernema feltiae, s. riobrave, or heterorhabditis bacteriophora. with the exception of seedling roots treated with h. bacteriophora, all seedlings treated with entomopathogenic nematodes had fewer m. incognita juveniles inside roots and produced fewer eggs than the control seedlings. tomato plants in the greenhouse were infested with 4,000 m. incognita eggs and treat ... | 2002 | 19265927 |
| red food coloring stain: new, safer procedures for staining nematodes in roots and egg masses on root surfaces. | acid fuchsin and phloxine b are commonly used to stain plant-parasitic nematodes in roots and egg masses on root surfaces, respectively. both stains can be harmful to both the user and the environment and require costly waste disposal procedures. we developed safer methods to replace both stains using mccormick schilling red food color. eggs, juveniles, and adults of meloidogyne incognita stained in roots with red food color were equally as visible as those stained with acid fuchsin. egg masses ... | 2002 | 19265929 |
| non-traditional legumes as potential soil amendments for nematode control. | dried ground plant tissues from 20 leguminous species were mixed with meloidogyne incognita-infested soil at 1, 2 or 2.5, and 5% (w/w) and incubated for 1 week at room temperature (21 to 27 degrees c). tomato ('rutgers') seedlings were transplanted into infested soil to determine nematode viability. most tissues reduced gall numbers below the non-amended controls. the tissue amendments that were most effective include: canavalia ensiformis, crotalaria retusa, indigofera hirsuta, i. nummularifoli ... | 2002 | 19265956 |
| development of multi-component transplant mixes for suppression of meloidogyne incognita on tomato (lycopersicon esculentum). | the effects of combinations of organic amendments, phytochemicals, and plant-growth promoting rhizobacteria on tomato (lycopersicon esculentum) germination, transplant growth, and infectivity of meloidogyne incognita were evaluated. two phytochemicals (citral and benzaldehyde), three organic amendments (pine bark, chitin, and hemicellulose), and three bacteria (serratia marcescens, brevibacterium iodinum, and pseudomonas fluorescens) were assessed. increasing rates of benzaldehyde and citral red ... | 2002 | 19265957 |
| host plant resistance as an alternative to methyl bromide for managing meloidogyne incognita in pepper. | pre-plant soil fumigation with methyl bromide and host resistance were compared for managing the southern root-knot nematode (meloidogyne incognita) in pepper. three pepper cultivars (carolina cayenne, keystone resistant giant, and california wonder) that differed in resistance to m. incognita were grown in field plots that had been fumigated with methyl bromide (98% chbr : 2% cclno [w/w]) before planting or left untreated. carolina cayenne is a well-adapted cayenne-type pepper that is highly re ... | 2002 | 19265959 |
| competition between heterodera glycines and meloidogyne incognita or pratylenchus penetrans: independent infection rate measurements. | competition on soybean between heterodera glycines (race 3) and meloidogyne incognita or h. glycines and pratylenchus penetrans were investigated in greenhouse experiments. each pair of nematode species was mixed in 3-ml suspensions at ratios of 1,000:0, 750:250, 500:500, 250:750, and 0:1,000 second-stage juveniles or mixed stages for p. penetrans. nematodes from a whole root system were counted and infection rates standardized per 1,000 nematodes (per replication) prior to testing the null hypo ... | 2003 | 19265967 |
| relationship of aerial broad band reflectance to meloidogyne incognita density in cotton. | aerial images were obtained on 22 july 1999 and 4 august 2000 from five cotton sites infested with meloidogyne incognita. images contained three broad bands representing the green (500-600 nm), red (600-700 nm), and near-infrared (700-900 nm) spectrum. soil samples were collected and assayed for nematodes in the fall at these sites. sampling locations were identified from images, by locating the coordinates of a wide range of light intensity (measured as a digital number) for each single band, a ... | 2003 | 19265974 |
| resistance as a tactic for management of meloidogyne incognita on cotton in north carolina. | selected cotton cultivars were evaluated for resistance to the southern root-knot nematode, meloidogyne incognita, in greenhouse and field experiments. cotton cultivars la 887, auburn 634, and nemx cotton were highly resistant to three north carolina populations of root-knot nematode in greenhouse experiments compared to susceptible cultivars. the relative susceptibility of cultivars tested in the greenhouse from most to least susceptible were deltapine 16 > deltapine 50 > la 887 or nemx > aubur ... | 2001 | 19266008 |
| greenhouse studies on the effect of marigolds (tagetes spp.) on four meloidogyne species. | the effects of preplanted marigold on tomato root galling and multiplication of meloidogyne incognita, m. javanica, m. arenaria, and m. hapla were studied. marigold cultivars of tagetes patula, t. erecta, t. signata, and a tagetes hybrid all reduced galling and numbers of second-stage juveniles in subsequent tomato compared to the tomato-tomato control. all four meloidogyne spp. reproduced on t. signata 'tangerine gem'. several cultivars of t. patula and t. erecta suppressed galling and reproduc ... | 1999 | 19270876 |
| rhizosphere colonization and control of meloidogyne spp. by nematode-trapping fungi. | the ability of nematode-trapping fungi to colonize the rhizosphere of crop plants has been suggested to be an important factor in biological control of root-infecting nematodes. in this study, rhizosphere colonization was evaluated for 38 isolates of nematode-trapping fungi representing 11 species. in an initial screen, arthrobotrys dactyloides, a. superba, and monacrosporium ellipsosporum were most frequently detected in the tomato rhizosphere. in subsequent pot experiments these fungi and the ... | 1999 | 19270886 |
| in-vitro assays of meloidogyne incognita and heterodera glycines for detection of nematode-antagonistic fungal compounds. | in-vitro methods were developed to test fungi for production of metabolites affecting nematode egg hatch and mobility of second-stage juveniles. separate assays were developed for two nematodes: root-knot nematode (meloidogyne incognita) and soybean cyst nematode (heterodera glycines). for egg hatch to be successfully assayed, eggs must first be surface-disinfested to avoid the confounding effects of incidental microbial growth facilitated by the fungal culture medium. sodium hypochlorite was mo ... | 1999 | 19270887 |
| effects of a resistant corn hybrid and fenamiphos on meloidogyne incognita in a corn-squash rotation. | the efficacy of a double-cross corn (zea mays) hybrid (old raccoon selection x t216) x (tebeau selection x mp 307) resistant to meloidogyne incognita as a rotational crop, and fenamiphos treatment for management of root-knot nematode (m. incognita race 1) in squash (cucurbita pepo var. melopepo) was evaluated in field tests during 1996 and 1997. numbers of m. incognita in the soil and root-gall indices were lower on the resistant hybrid than on a commercial cultivar dekalb dk-683. treatment mean ... | 1999 | 19270888 |
| meloidogyne incognita surface antigen epitopes in infected arabidopsis roots. | surface-coat epitopes of meloidogyne incognita were detected in root tissues of arabidopsis thaliana during migration and feeding site formation. a whole-mount root technique was used for immunolocalization of surface coat epitopes in a. thaliana, with the aid of a monoclonal antibody raised specifically against the outer surface of infective juveniles of m. incognita. the antibody, which was meloidogyne-specific, recognized a fucosyl-bearing glycoprotein in the surface coat. during migration in ... | 1999 | 19270892 |
| identification of sources of resistance to four species of root-knot nematodes in tobacco. | resistance to the southern root-knot nematode, meloidogyne incognita races 1 and 3, has been identified, incorporated, and deployed into commercial cultivars of tobacco, nicotiana tabacum. cultivars with resistance to other economically important root-knot nematode species attacking tobacco, m. arenaria, m. hapla, m. javanica, and other host-specific races of m. incognita, are not available in the united states. twenty-eight tobacco genotypes of diverse origin and two standard cultivars, nc 2326 ... | 1999 | 19270897 |
| reproduction and development of meloidogyne incognita and m. javanica on guardian peach rootstock. | guardian peach rootstock was evaluated for susceptibility to meloidogyne incognita race 3 (georgia-peach isolate) and m. javanica in the greenhouse. both commercial guardian seed sources produced plants that were poor hosts of m. incognita and m. javanica. reproduction as measured by number of egg masses and eggs per plant, eggs per egg mass, and eggs per gram of root were a better measure of host resistance than number of root galls per plant. penetration, development, and reproduction of m. in ... | 1999 | 19270905 |
| carbon partitioning in soybean infected with meloidogyne incognita and m. javanica. | seven-day-old seedlings of two cultivars (cristalina and ufv itm1) of glycine max were inoculated with 0, 3,000, 9,000, or 27,000 eggs of meloidogyne incognita race 3 or m. javanica and maintained in a greenhouse. thirty days later, plants were exposed to (1)co for 4 hours. twenty hours after (1)co exposure, the root fresh weight, leaf dry weight, nematode eggs per gram of root, total and specific radioactivity of carbohydrates in roots, and root carbohydrate content were evaluated. meloidogyne ... | 1999 | 19270907 |
| evaluation of dry ice as a potential cryonematicide for meloidogyne incognita in soil. | solid co (dry ice) was added to pots containing soil that was infested either with eggs of the root-knot nematode, meloidogyne incognita, or with tomato (lycopersicon esculentum 'rutgers') root fragments that were infected with various stages of the nematode. two hours after dry ice was added, thermocouples in the soil recorded temperatures ranging from -15 degrees c to -59 degrees c. one day after treatment with the dry ice, the temperature of the soil was allowed to equilibrate with that of th ... | 1999 | 19270918 |
| survey of crop losses in response to phytoparasitic nematodes in the united states for 1994. | previous reports of crop losses to plant-parasitic nematodes have relied on published results of survey data based on certain commodities, including tobacco, peanuts, cotton, and soybean. reports on crop-loss assessment by land-grant universities and many commodity groups generally are no longer available, with the exception of the university of georgia, the beltwide cotton conference, and selected groups concerned with soybean. the society of nematologists extension committee contacted extensio ... | 1999 | 19270925 |
| host suitability of potential cover crops for root-knot nematodes. | several potential cover crops were evaluated for their susceptibility to meloidogyne arenaria race 1, m. incognita race 1, and m. javanica in a series of five greenhouse experiments. no galls or egg masses were observed on roots of castor (ricinus communis), cowpea (vigna unguiculata cv. iron clay), crotalaria (crotalaria spectabilis), or american jointvetch (aeschynomene americana). occasional egg masses (rating </=1.0 on 0-5 scale) were observed on marigold (tagetes minuta) in one test with m. ... | 1999 | 19270926 |
| fosthiazate controls meloidogyne arenaria and m. incognita in flue-cured tobacco. | the nematicide fosthiazate was evaluated over a 3-year period for management of meloidogyne incognita race 3 (site 1) and m. arenaria race 2 (site 2) in flue-cured tobacco. fosthiazate was applied broadcast and incorporated at rates ranging from 22 to 88 g a.i./100 m(2), and compared with the nematicides fenamiphos (67 g a.i./100 m(2)), 1,3-d (56.1 l/ha, 670 ml/100-m row), and an untreated control. root-gall indices and leaf yields were averaged over the 3-year period. root galling was negativel ... | 1999 | 19270938 |
| comparison of variable and single-rate applications of aldicarb on cotton yield in fields infested with meloidogyne incognita. | variable-rate applications of the nematicide aldicarb were compared to producer standard rates in eight field tests over 3 years. test areas (308 to 1,015 m long) were divided into eight or five blocks. each block contained two plots with a variable-rate treatment (vrt) of aldicarb and a producer standard treatment (pst) of aldicarb. each vrt plot was divided into three subunits and intensively sampled for meloidogyne incognita in either the fall or spring before planting. rates of aldicarb were ... | 1999 | 19270939 |
| effect of temperature on suppression of meloidogyne incognita by tagetes cultivars. | the suppression of meloidogyne incognita by marigolds differed among six marigold cultivars and five soil temperatures. tagetes signata (syn. t. tenuifolia) cv. tangerine gem and the tagetes hybrid polynema allowed reproduction and root galling when grown at 30 degrees c, and should not be used for control of m. incognita at temperatures close to 30 degrees c. tagetes patula cultivars single gold and tangerine and t. erecta flor de muerto, when grown within a 20-30 degrees c soil temperature ran ... | 1999 | 19270940 |
| population dynamics of meloidogyne incognita, m. arenaria,and other nematodes and crop yields in rotations of cotton, peanut, and wheat under minimum tillage. | wheat, cotton, and peanut were arranged in three cropping sequences to determine the effects of fenamiphos (6.7 kg a.i./ha) and cropping sequence on nematode population densities and crop yields under conservation tillage and irrigation for 6 years. the cropping sequences included a wheat winter cover crop each year and summer crops of cotton every year, peanut every year, or cotton rotated every other year with peanut. the population densities of meloidogyne spp. and helicotylenchus dihystera w ... | 2000 | 19270949 |
| effect of mulch surface color on root-knot of tomato grown in simulated planting beds. | the effect of different-colored polyethylene mulches on quantity and spectra of reflected light, plant morphology, and root-knot disease was studied in tomato (lycopersicon esculentum) grown in simulated planting beds. tomato plants were inoculated with meloidogyne incognita at initial populations (pi) of 0, 1,000, 10,000, or 50,000 eggs/plant, and grown in a greenhouse for 50 days over white, red, or black mulch. soil temperature was kept constant among the mulch treatments by placing an insula ... | 2000 | 19270954 |
| origin of a meloidogyne incognita surface coat antigen. | the surface coat (sc) of plant nematodes is thought to originate either from the living hypodermis or from secretory glands associated with the excretory system or nervous system. in this study, we investigated the origin of the sc of meloidogyne incognita by immunolocalization with a monoclonal antibody raised against the surface coat of the preparasitic juveniles (j2). under the electron microscope, strong labeling was found on the cuticular surface and in the rectal dilation of the j2, while ... | 2000 | 19270963 |
| variability in time and space of meloidogyne incognita fall population density in cotton fields. | three cotton fields infested with meloidogyne incognita were intensively sampled in the fall for 3 years (1996 to 1998) to determine if intensive sampling for m. incognita, for which spatial location is important, was necessary every year in a continuous cotton system. two composite soil samples (20 cores each), taken over an area covering one-third of the field length and two rows wide, were averaged to represent that area (row-location combination). each field (except one) had 24 areas assayed ... | 2000 | 19270975 |
| reproductive variability of field populations of meloidogyne spp. on grape rootstocks. | variability in penetration, development, and reproduction of two resistance-breaking field pathotypes (pt.) of meloidogyne arenaria, m. incognita, and a population of mixed meloidogyne spp. virulent to grape hosts were compared on two resistant vitis rootstocks 'freedom' and 'harmony' in separate tests. 'cabernet sauvignon' was included as a susceptible host to all four nematode populations. secondstage juveniles (j2) of the mixed population failed to penetrate freedom roots. by contrast, 6% of ... | 2000 | 19270976 |
| effects of potato-cotton cropping systems and nematicides on plant-parasitic nematodes and crop yields. | belonolaimus longicaudatus has been reported as damaging both potato (solanum tuberosum) and cotton (gossypium hirsutum). these crops are not normally grown in cropping systems together in areas where the soil is infested with b. longicaudatus. during the 1990s cotton was grown in a potato production region that was a suitable habitat for b. longicaudatus. it was not known how integrating the production of these two crops by rotation or double-cropping would affect the population densities of b. ... | 2000 | 19270980 |
| using microwave irradiation to improve preservation of female nematodes and gall tissues for tem observations. | microwave irradiation of glutaraldehyde-immersed samples was evaluated for the chemical fixation of 3-week-old galls that resulted from the infection of tomato roots (lycopersicon esculentum) by a root-knot nematode, meloidogyne incognita. observation by transmission electron microscopy indicated that the best results were obtained when vials containing the intact galls were immersed in buffered glutaraldehyde and irradiated for 10 seconds then allowed to cool for 30 seconds; this procedure was ... | 2000 | 19270984 |
| heat stability of resistance to meloidogyne incognita in scotch bonnet peppers ( capsicum chinense jacq.). | stability of resistance to meloidogyne incognita (kofoid &white) chitwood was determined in pepper (capsicum chinense jacq. and c. annuum l.) at 24, 28, and 32 degrees c. reactions of the c. annuum cultivars charleston belle and keystone resistant giant and the c. chinense cultigens pa-426 and pa-350 to m. incognita were compared. charleston belle is homozygous for the n gene that confers resistance to m. incognita in c. annuum, and keystone resistant giant is the susceptible recurrent parent of ... | 2000 | 19270989 |
| effects of meloidogyne incognita on growth and storage-root formation of cassava (manihot esculenta). | two-node cuttings of cassava cultivar ss4 were inoculated with 1,000 infective juveniles of meloidogyne incognita at 1, 14, 40, 70, 88, and 127 days after planting (dap). plant growth and root damage were assessed at 150 dap. meloidogyne incognita significantly reduced the number of storageroots formed in plants inoculated at 14, 40, 70, and 88 dap and the total weight of storage-roots in plants inoculated at 1, 14, 40, 70, and 88 dap, compared to uninoculated plants. individual storage-root wei ... | 2000 | 19270997 |
| a survey of plant-parasitic nematodes associated with cotton in northeastern louisiana. | a survey was conducted in northeastern louisiana to determine the frequency and abundance of plant-parasitic nematodes associated with cotton. in fall 1997 and 1998, more than 600 soil samples were collected from cotton fields representing 6,200 ha, which is 5.3% of the cotton production hectarage in this region. composite soil samples were collected from 10 ha in each field. nematodes were extracted by gravity screening and sucrose centrifugation, identified to genus, and quantified. nine gener ... | 2000 | 19271002 |
| root galling and reproduction of meloidogyne incognita isolates from texas on resistant cotton genotypes. | several cotton genotypes with resistance to meloidogyne incognita have been released in recent years. to estimate the durability of this resistance, galling severity on these resistant genotypes by m. incognita was measured. nematode isolates (115 total) were collected from cotton fields in 14 texas counties in august and september 1996 and 1997. four additional isolates from maryland, mississippi, and north carolina were also tested. the isolates were evaluated in 12 greenhouse experiments for ... | 2000 | 19271003 |
| rate response of 1,3-dichloropropene for nematode control in spring squash in deep sand soils. | the soil fumigant 1,3-dichloropropene (1,3-d) formulated with chloropicrin is viewed as a likely alternative for replacing methyl bromide in florida when the latter is phased out in 2005. therefore, it behooves us to learn more about using 1,3-d in deep, sand soils. two trials were conducted on spring squash to determine the most effective rate of 1,3-d for the control of meloidogyne spp. rates tested included 0, 56, 84, 112, and 168 liters/ha of 1,3-d applied broadcast with conventional chisels ... | 2000 | 19271005 |
| effects of solarization and ammonium amendments on plant-parasitic nematodes. | the effects of soil solarization and ammonium bicarbonate or ammonium sulfate against plant-parasitic nematodes on yellow squash (cucurbita pepo) and on vinca (catharanthus roseus) were evaluated at two sites. solarization for 3 weeks in the spring suppressed population levels of belonolaimus longicaudatus, criconemella spp., and dolichodorus heterocephalus throughout the growing season on both crops at both sites. levels of meloidogyne incognita were suppressed initially, but population densiti ... | 2000 | 19271007 |
| survey of meloidogyne incognita and thielaviopsis basicola: their impact on cotton fruiting and producers' management choices in infested fields. | a survey of 100 cotton fields selected randomly in 1995 and 1996 was conducted in the high plains of texas to determine the incidence and potential severity of meloidogyne incognita and thielaviopsis basicola. information was obtained from producers for each field on their nematicide application rates and fungicide seed treatments. the percent of squares and bolls set was evaluated for 20 plants in each field during late july 1995 and early august 1996. thielaviopsis basicola was identified in 5 ... | 2000 | 19271012 |
| resistance in selected corn hybrids to meloidogyne arenaria and m. incognita. | a total of 33 corn hybrids were evaluated in a series of greenhouse and field trials to determine if they differed in resistance to either meloidogyne incognita race 3 or m. arenaria race 1. reproduction of m. incognita race 3 and m. arenaria race 1 on the hybrids was also compared. reproduction of m. arenaria differed among corn hybrids after 58 to 65 days in greenhouse experiments; however, reproduction was similar among hybrids in the field experiment. no hybrids were consistently resistant t ... | 2000 | 19271019 |
| replacement series: a tool for characterizing competition between phytoparasitic nematodes. | the replacement series approach was used to detect and define competition between meloidogyne incognita (mi) and rotylenchulus reniformis (rr) on soybean. in three greenhouse tests, soybean cv. davis seedlings were inoculated with 1,000 vermiform nematodes in the following mi:rr ratios: 0:0, 100:0, 75:25, 50:50, 25:75, and 0:100. after 86 days, relative nematode-yield values (number of each species in mixed culture divided by number in nonmixed culture) were calculated based on nematodes in soil ... | 1997 | 19274132 |
| effects of temperature on resistance in phaseolus vulgaris genotypes and on development of meloidogyne species. | phaseolus vulgaris lines with heat-stable resistance to meloidogyne spp. may be needed to manage root-knot nematodes in tropical regions. resistance expression before and during the process of nematode penetration and development in resistant genotypes were studied at pre- and postinoculation temperatures of 24 degrees c and 24 degrees c, 24 degrees c and 28 degrees c, 28 degrees c and 24 degrees c, and 28 degrees c and 28 degrees c. resistance was effective at all temperature regimes examined, ... | 1997 | 19274137 |
| antioxidant enzymes in phytoparasitic nematodes. | presence of different antioxidant enzymes, such as superoxide dismutase (sod), catalase, and ascorbate, p-phenilendiamine-pyrocathecol (ppd-pc), o-dianisidine, and guaiacol isoperoxidases, was shown in the phytoparasific nematode species meloidogyne incognita, m. hapla, globodera rostochiensis, g. pallida, heterodera schachtii, h. carotae, and xiphinema index. the activity of the enzymes tested differed among the life stages examined. sod was present in cysts but was not detected in meloidogyne ... | 1997 | 19274144 |
| effects of meloidogyne spp. and rhizoctonia solani on the growth of grapevine rootings. | a disease complex involving meloidogyne incognita and rhizoctonia solani was associated with stunting of grapevines in a field nursery. nematode reproduction was occurring on both susceptible and resistant cultivars, and pot experiments were conducted to determine the virulence of this m. incognita population, and of m. javanica and m. hapla populations, to v. vinifera cv. colombard (susceptible) and to v. champinii cv. ramsey (regarded locally as highly resistant). the virulence of r. solani is ... | 1997 | 19274149 |
| extraction of root-associated meloidogyne incognita and rotylenchulus reniformis. | a technique based on physical maceration of root tissue was developed to extract vermiform and swollen stages of meloidogyne incognita and rotylenchulus reniformis. experiments conducted on soybean and tomato evaluated the efficiency of method (stir, grind), naoc1 concentration (0%, 0.5%), and duration (lx, 2x) on extraction of nematodes and eggs from 60-day-old populations. root-associated populations of r. reniformis were considerably lower than those of m. incognita, so development of the met ... | 1997 | 19274151 |
| antibodies from chicken eggs as probes for antigens from pasteuria penetrans endospores. | the bacteria pasteuria spp. have been identified as among the most promising of several microbial organisms currently under investigation as biological control agents of plant-parasitic nematodes. as part of our goal to develop methods to discriminate isolates of pasteuria penetrans with different host preferences, we investigated the potential of developing antibody probes to identify endospores of different isolates of p. penetrans. polyclonal igy antibodies were raised in chickens against end ... | 1997 | 19274158 |
| unique immunogenic proteins in heterodera glycines eggshells. | polyclonal antibodies were raised against heterodera glycines eggshells to determine the feasibility of developing an immunoassay for h. glycines eggs. an indirect enzyme-linked immunosorbent assay (elisa) was developed from anfisera collected 10 weeks after the initial injection. from serial dilutions of sonicated eggshells or whole eggs, a sensitivity of detection to 5 ng/ml sonicated eggshells or 1 egg of h. glycines was determined. the method of eggshell preparation had no effect on the anti ... | 1997 | 19274159 |
| tolerance to rotylenchulus reniformis and resistance to meloidogyne incognita race 3 in high-yielding breeding lines of upland cotton. | field experiments in 1992 and 1994 were conducted to determine the effect of rotylenchulus reniformis, reniform nematode, on lint yield and fiber quality of 10 experimental breeding lines of cotton (gossypium hirsutum) in untreated plots or plots fumigated with 1,3-dichloropropene. controls were la. rn 1032, a germplasm line possessing some resistance to r. reniformis, and stoneville 453, a cultivar that is susceptible to reniform nematode. several breeding lines produced greater lint yields tha ... | 1997 | 19274165 |
| differential response to root-knot nematodes in prunus species and correlative genetic implications. | responses of 17 prunus rootstocks or accessions (11 from the subgenus amygdalus and 6 from the subgenus prunophora) were evaluated against 11 isolates of meloidogyne spp. including one m. arenaria, four m. incognita, four m. javanica, one m. hispanica, and an unclassified population from florida. characterization of plant response to root-knot nematodes was based on a gall index rating. numbers of females and juveniles plus eggs in the roots were determined for 10 of the rootstocks evaluated aga ... | 1997 | 19274170 |
| relationship between meloidogyne incognita and rotylenchulus reniformis as influenced by soybean genotype. | the effect of soybean genotype on competition between meloidogyne incognita race 2 (mi) and rotylenchulus reniformis (rr) was evaluated in greenhouse and microplot replacement series experiments. soil in pots containing seedlings of 'davis' (susceptible to mi) or 'buckshot 66' (resistant to mi) was infested with 1,000 vermiform individuals in the following mi:rr ratios: 0:0, 100:0, 75:25, 50:50, 25:75, or 0:100. after 91 days, the relative nematode yields (number of nematodes in mixed culture di ... | 1997 | 19274173 |
| meloidogyne incognita inoculum source affects host suitability and growth of yellow nutsedge and chile pepper. | meloidogyne incognita (mi) reproduction and host plant responses in chile pepper (capsicum annuum) and yellow nutsedge (cyperus esculentus = yns) to three sources of inoculum obtained by rearing a single mi population on chile, yns, and tomato were evaluated in two factorial greenhouse experiments. the interactive effects of mi inoculum source and crop-weed competition were determined. in the absence of yns competition, chile growth was reduced less by mi inoculum from chile than by inoculum fro ... | 1997 | 19274174 |
| activity and differential induction of chitinase isozymes in soybean cultivars resistant or susceptible to root-knot nematodes. | host physiological events in relation to infestation by parasitic nematodes are not well documented. soybean plant responses to meloidogyne incognita infestation were compared to resistant (bryan) and susceptible (brim) cultivars at 0, 1, 3, 10, 20, and 34 days after infestation (dai). the resistant cultivar had higher chitinase activity than the susceptible cultivar at every sample time beginning at 3 dai. results from isoelectric focusing gel electrophoresis analyses indicated that three acidi ... | 1997 | 19274189 |
| evaluation of nemx, a new cultivar of cotton with high resistance to meloidogyne incognita. | the level of resistance to root-knot nematode, meloidogyne incognita, in nemx, a new cultivar of the acala-type upland cotton, was evaluated in relation to four resistant breeding lines (n6072, n8577, n901, and n903) and four susceptible cultivars (maxxa, sj2, royale, and prema). in growth pouch tests, an average of only 4 nematode egg masses was produced on roots of nemx or the resistant lines, compared to a significantly higher average of 21 on the susceptible cultivars. in pot tests, the nema ... | 1997 | 19274190 |
| colored mulches affect yield of fresh-market tomato infected with meloidogyne incognita. | the effects of different-colored polyethylene mulches on the quantity and spectra of reflected light, earliness of fruit set, fruit yield and quality, and root-knot disease were studied in field-grown, staked tomato (lycopersicon esculentum). white mulch reflected more photosynthetic light and a lower far-red-to-red ratio than red mulch, whereas black mulch reflected less than 5 percent of any color. soil temperatures and fruit yields were recorded for tomato plants inoculated with meloidogyne i ... | 1997 | 19274191 |