Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| construction of a bacterial artificial chromosome library of tm-1, a standard line for genetics and genomics in upland cotton. | a bacterial artificial chromosome (bac) library was constructed for gossypium hirsutum acc. tm-1, a genetic and genomic standard line for upland cotton. the library consists of 147 456 clones with an average insert size of 122.8 kb ranging from 97 to 240 kb. about 96.0% of the clones have inserts over 100 kb. therefore, this library represents theoretically 7.4 haploid genome equivalents based on an ad genome size of 2 425 mb. clones were stored in 384 384(-) well plates and arrayed into multipl ... | 2009 | 19166501 |
| devitalization of transgenic seed that preserves dna and protein integrity. | agricultural biotechnology companies have been asked to provide intact transgenic seed to regulatory agencies as reference materials for evaluating transgene and protein detection methods (pcr and immunoassay). due to intellectual-property and product-stewardship considerations, submission of devitalized seed prior to regulatory approval is preferable in any given country. commonly used devitalization procedures, such as heating or autoclaving, degrade the protein and/or dna rendering the seed u ... | 2008 | 19183799 |
| undamaged cotton plants yield more if their neighbour is damaged: implications for pest management. | understanding the compensatory responses of crops to pest damage is important in developing pest thresholds. compensation for pest damage in crops can occur at the plant level, where the architecture, growth dynamics and allocation patterns of damaged plants are altered, allowing them to recover or, at the crop level, where differential damage between plants may alter plant-to-plant interactions. we investigated growth and yield of cotton (gossypium hirsutum l.) following non-uniform manual defo ... | 2009 | 19203400 |
| scanning electron microscopy applied to seed-borne fungi examination. | the aim of this study was to test the standard scanning electron microscopy (sem) as a potential alternative to study seed-borne fungi in seeds, by two different conditions of blotter test and water restriction treatment. in the blotter test, seeds were subjected to conditions that enabled pathogen growth and expression, whereas the water restriction method consisted in preventing seed germination during the incubation period, resulting in the artificial inoculation of fungi. in the first condit ... | 2009 | 19204924 |
| identification and expression of a new delta-12 fatty acid desaturase (fad2-4) gene in upland cotton and its functional expression in yeast and arabidopsis thaliana plants. | a cotton (gossypium hirsutum l.) genomic clone encompassing a 17.9-kb dna fragment was found to contain a delta-12 fatty acid desaturase gene (designated fad2-4). the fad2-4 open reading frame has 1,155bp and is uninterrupted, encoding a conceptual fad2-4 polypeptide of 384 amino acids that has 98% identity with the cotton fad2-3 polypeptide. the fad2-4 gene has a single intron of 2,780 bp in its 5'-untranslated region (5'-utr). the 3'-flanking regions and 5'-utr introns in the fad2-4 and fad2-3 ... | 2009 | 19217793 |
| temporal analysis of cotton boll symptoms resulting from southern green stink bug feeding and transmission of a bacterial pathogen. | the southern green stink bug, nezara viridula (l.), is a significant pest of cotton, gossypium hirsutum l., and is becoming an increasing challenge due to the decrease in use of broad-spectrum insecticides on the crop. the southern green stink bug can vector an opportunistic pantoea agglomerans strain (designated sc 1-r) into cotton bolls, resulting in infection. the appearance of stink bug damage varies, and pest managers cannot readily identify its source. this research reports a systematic de ... | 2009 | 19253615 |
| comparisons of boll weevil (coleoptera: curculionidae) pheromone traps with and without kill strips. | boll weevil, anthonomus grandis grandis boheman (coleoptera: curculionidae), eradication programs typically equip pheromone traps with an insecticide-impregnated kill strip. these strips are intended to kill captured insects, thereby simplifying trap servicing and reducing the loss of weevils from predation and escape. however, the effectiveness of kill strips has not been extensively evaluated. we examined the influences of kill strips on weevil captures, trap servicing, and the incidences of w ... | 2009 | 19253635 |
| can the amount of corn acreage predict fall armyworm (lepidoptera: noctuidae) infestation levels in nearby cotton? | fall armyworm, spodoptera frugiperda (j.e. smith) (lepidoptera: noctuidae), is a major pest of corn, zea mays l., and a significant, but more sporadic, pest of cotton, gossypium hirsutum l., in the western hemisphere. previous studies showed that the cotton infestations primarily involve a fall armyworm subpopulation known as the "corn-strain" for which corn is the preferred host plant. it was suggested that the fall armyworm infesting cotton originated in corn and spread into secondary hosts as ... | 2009 | 19253639 |
| bacillus thuringiensis cry1ac resistance frequency in tobacco budworm (lepidoptera: noctuidae). | the tobacco budworm, heliothis virescens (f.) (lepidoptera: noctuidae), is one of the most important pests of cotton, gossypium hirsutum l, that has become resistant to a wide range of synthetic insecticides. crylac-expressing cotton has proven its effectiveness against this insect since its introduction in north america in 1996. however, the constant exposure of tobacco budworm to this protein toxin may result in the development of resistance to it. to estimate the frequency of alleles that con ... | 2009 | 19253658 |
| 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 |
| 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 |
| detection of suppressiveness against rotylenchulus reniformis in soil from cotton (gossypium hirsutum) fields in texas and louisiana. | rotylenchulus reniformis is a major problem confronting cotton production in the central part of the cotton belt of the united states of america. in this study, the hypothesis that natural antagonists in some cases are responsible for unusually low densities of the nematode in certain fields was tested by assaying soils from 22 selected fields for the presence of transferable agents in pots containing cotton plants. in one field, soil from four different depth ranges was tested. in the first of ... | 2008 | 19259517 |
| 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 |
| interaction of rotylenchulus reniformis with seedling disease pathogens of cotton. | the impact of 10 fusarium species in concomitant association with rotylenchulus reniformis on cotton seedling disease was examined under greenhouse conditions. in experiment 1, fungal treatments consisted of fusarium chlamydosporum, f. equiseti, f. lateritium, f. moniliforme, f. oxysporum, f. oxysporum f.sp. vasinfectum, f. proliferatum, f. semitectum, f. solani, and f. sporotrichioides; rhizoctonia solani; and thielaviopsis basicola. the experimental design was a 2 x 14 factorial consisting of ... | 2004 | 19262802 |
| suppression of rotylenchulus reniformis on cotton by the nematophagous fungus arf. | the reniform nematode, rotylenchulus reniformis linford &oliveira, has become a serious threat to cotton (gossypium hirsutum l.) production in the united states during the past decade. the objective of this study is to isolate fungi from eggs of r. reniformis and select potential biological control agents for r. reniformis on cotton. soil samples were collected from cotton fields located in jefferson county, arkansas. eight genera of fungi were included in the 128 fungal isolates obtained, and a ... | 2004 | 19262806 |
| influence of poultry litter applications on nematode communities in cotton agroecosystems. | the effects of the application of poultry litter at 0.0, 6.7, 13.4, and 20.1 tons/ha on population changes during the growing season on nematode communities were evaluated in two cotton production fields in north carolina. numbers of bactivorous nematodes increased at midseason in response to the rate at which litter was applied but decreased with increasing litter application rates at cotton harvest. numbers of fungivores at cotton harvest were related positively to the rate of litter applied, ... | 2004 | 19262834 |
| histological changes in gossypium hirsutum associated with reduced reproduction of rotylenchulus reniformis. | the reniform nematode (rotylenchulus reniformis) is an important parasite of upland cotton (gossypium hirsutum). parasitism involves the formation of syncytia to provide nutrition for the female. events that occur at the feeding site may determine the degree of susceptibility of cotton plants to reniform nematode. the objective of this work was to describe histological modifications associated with reduced reproduction of rotylenchulus reniformis in upland cotton roots. 'deltapine 50' cotton and ... | 2005 | 19262859 |
| 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 |
| vertical distribution of rotylenchulus reniformis in cotton fields. | the possible impact of rotylenchulus reniformis below plow depth was evaluated by measuring the vertical distribution of r. reniformis and soil texture in 20 symptomatic fields on 17 farms across six states. the mean nematode population density per field, 0 to 122 cm deep, ranged from 0.4 to 63 nematodes/g soil, and in 15 fields more than half of the r. reniformis present were below 30.5 cm, which is the greatest depth usually plowed by farmers or sampled by consultants. in 11 fields measured, r ... | 2005 | 19262871 |
| rotylenchulus reniformis below plow depth suppresses cotton yield and root growth. | damage to cotton by rotylenchulus reniformis below plow depth was evaluated in a sandy clay loam soil at weslaco, texas. in december 1999, 14 holes on 51-cm centers were dug 91 cm deep along the planting bed and adjacent furrow and 2 ml of 1,3-dichloropropene was placed 91, 61, and 30 cm deep as each hole was refilled and packed. this technique eliminated 96%, 81%, and 74% of r. reniformis down to 107 cm at distances 0, 25, and 51 cm laterally from the point of application (p </= 0.05), whereas ... | 2005 | 19262875 |
| histological observations of rotylenchulus reniformis on gossypium longicalyx and interspecific cotton hybrids. | observations on the development of reniform nematode (rotylenchulus reniformis) on roots of gossypium longicalyx, g. hirsutum, and two interspecific hybrids derived from them were made by light microscopy. gossypium longicalyx is reported to be immune to reniform nematode, but the mechanism(s) for resistance are unknown. penetration of g. longicalyx roots by female nematodes was confirmed, and incipient swelling of the females, indicating initiation of maturation of the reproductive system, was ... | 2005 | 19262889 |
| 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 |
| 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 |
| rotylenchulus reniformis management in cotton with crop rotation. | one-year crop rotations with corn or highly resistant soybean were evaluated at four locations for their effect on rotylenchulus reniformis population levels and yield of a subsequent cotton crop. four nematicide (aldicarb) regimes were included at two of the locations, and rotation with reniform-susceptible soybean was included at the other two locations. one-year rotations to corn or resistant soybean resulted in lower r. reniformis population levels (p </= 0.05) than those found in cotton at ... | 2003 | 19265975 |
| impact of cotton production systems on management of hoplolaimus columbus. | the effectiveness of selected cultural practices in managing the columbia lance nematode, hoplolaimus columbus, on cotton was evaluated in experiments in growers' infested fields. the effects of planting date, cotton cultivar, treatment with the growth regulator mepiquat chloride, and destruction of cotton-root systems after harvest on cotton-lint yield and population densities of h. columbus were studied. the yield of cotton cultivar deltapine 50 was negatively related (p = 0.054) to initial po ... | 2003 | 19265977 |
| bahiagrass, corn, cotton rotations, and pesticides for managing nematodes, diseases, and insects on peanut. | florunner peanut was grown after 1 and 2 years of tifton 9 bahiagrass, corn, cotton, and continuous peanut as whole-plots. pesticide treatments aldicarb (3.4 kg a.i./ha), flutolanil (1.7 kg a.i./ha), aldicarb + flutolanil, and untreated (control) were sub-plots. numbers of meloidogyne arenaria second-stage juveniles in the soil and root-gall indices of peanut at harvest were consistently lower in plots treated with aldicarb and aldicarb + flutolanil than in flutolanil-treated and untreated plots ... | 1999 | 19270889 |
| 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 |
| 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 |
| 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 |
| yield reduction and root damage to cotton induced by belonolaimus longicaudatus. | sting nematode (belonolaimus longicaudatus) is recognized as a pathogen of cotton (gossypium hirsutum), but the expected damage from a given population density of this nematode has not been determined. the objective of this study was to quantify the effects of increasing initial population densities (pi) of b. longicaudatus on cotton yield and root mass. in a field plot study, nematicide application and cropping history were used to obtain a wide range of pi values. cotton yields were regressed ... | 2000 | 19270967 |
| population dynamics of belonolaimus longicaudatusin a cotton production system. | belonolaimus longicaudatus is a recognized pathogen of cotton (gossypium hirsutum), but insufficient information is available on the population dynamics and economic thresholds of b. longicaudatus in cotton production. in this study, data collected from a field in florida were used to develop models predicting population increases of b. longicaudatus on cotton and population declines under clean fallow. population densities of b. longicaudatus increased on cotton, reaching a carrying capacity of ... | 2000 | 19270968 |
| 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 |
| 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 |
| tolerance of selected cotton lines to rotylenchulus reniformis. | the reproductive and damage potential of the reniform nematode, rotylenchulus reniformis, on five cotton breeding lines reported as tolerant to this nematode in texas were compared with two standard cotton cultivars, deltapine 50 and stoneville la 887, in a north carolina field naturally infested with r. reniformis. numbers of r. reniformis in soil were suppressed at mid-season, and cotton-lint yield was increased by preplant fumigation with 1,3-dichloropropene. population densities of r. renifo ... | 2000 | 19271004 |
| effect of foliar applications of oxamyl with aldicarb for the management of rotylenchulus reniformison cotton. | the efficacy of foliar applications of oxamyl were evaluated for the management of rotylenchulus reniformis on cotton in mississippi. two tests were established in tallahatchie county on a fine sandy loam soil (56.8% sand, 37.8% silt, 5.3% clay, ph 5.4, and 0.3% om) naturally infested with r. reniformis. oxamyl was applied as a foliar spray at 0.14, 0.27, or 0.53 kg a.i./ha to cotton plants that had reached the sixth true leaf growth stage. a second oxamyl application was applied 14 days after t ... | 2000 | 19271008 |
| efficacy of cotton root destruction and winter cover crops for suppression of hoplolaimus columbus. | the efficacy of rye (secale cereale) and wheat (triticum aestivum) winter cover crops and cotton stalk and root destruction (i.e., pulling them up) were evaluated in field tests during two growing seasons for hoplolaimus columbus management in cotton. the effect of removing debris from the field following root destruction also was evaluated. wheat and rye produced similar amounts of biomass, and both crops produced more biomass (p </= 0.05) following cotton root destruction. cover crops did not ... | 2000 | 19271009 |
| 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 |
| 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 |
| peanut-cotton-rye rotations and soil chemical treatment for managing nematodes and thrips. | in the southeastern united states, a cotton-peanut rotation is attractive because of the high value and extensive planting of both crops in the region. the objective of this experiment was to determine the effects of cotton-peanut rotations, rye, and soil chemical treatments on management of plant-parasitic nematodes, thrips, and soilborne fungal diseases and on crop yield. peanut-cotton-rye rotations were conducted from 1988 to 1994 on tifton loamy sand (plinthic kandiudult) infested primarily ... | 1998 | 19274213 |
| crop yields and nematode population densities in triticale-cotton and triticale-soybean rotations. | triticale cv. beagle 82, cotton cv. mcnair 235, and soybean cv. twiggs were arranged in three cropping sequences to determine the effects of fenamiphos and cropping sequence on nematode population densities and crop yields under conservation tillage for 4 years. the cropping sequences were triticale (t)-cotton (c)-t-c, t-soybean (s)-t-s, and t-c-t-s. numbers of meloidogyne incognita second-stage juveniles declined on trificale but increased on cotton and soybean each year. root-gall indices of c ... | 1998 | 19274228 |
| interaction between meloidogyne incognita and thielaviopsis basicola on cotton (gossypium hirsutum). | the effects of meloidogyne incognita and thielaviopsis basicola on the growth of cotton (gossypium hirsutum) and the effects of t. basicola on m. incognita populations were evaluated in a 2-year study. microplots were infested with m. incognita, t. basicola, or a combination of m. incognita and t. basicola. uninfested plots served as controls both years. seedling survival was decreased by the m. incognita + t. basicola treatment compared to the control. meloidogyne incognita alone and m. incogni ... | 1998 | 19274234 |
| the lance nematode, hoplolaimus magnistylus, on cotton in arkansas. | the population density of hoplolaimus magnistylus, a lance nematode, in cotton was determined at planting, mid-season, and harvest during the 1995 and 1996 growing seasons for a poinsett county, arkansas field. nematode populations increased from planting to harvest in 1995 but declined in 1996. application of aldicarb at planting at rates of 0.59 or 0.84 kg a.i./ha did not influence either nematode population density or cotton yield. this study indicates that h. magnistylus is not a serious pes ... | 1998 | 19274251 |
| responses of cotton yield and meloidogyne incognita soil populations to soil applications of aldicarb and 1,3-d in florida. | in four tests conducted in loamy-sand soils in northern florida, cotton lint yield increased and post-harvest soil populations of meloidogyne incognita were more effectively suppressed by 1,3-dichloropropene (1,3-d) than aldicarb when both nematicides were evaluated over a range of recommended rates. significant positive relationships existed between lint yield and rates of 1,3-d in three tests, whereas only one significant positive relationship occurred between lint yield and aldicarb rates. yi ... | 1998 | 19274259 |
| resistance to meloidogyne incognita race 3 and rotylenchulus reniformis in wild accessions of gossypium hirsutum and g. barbadense from mexico. | forty-six accessions of g. hirsutum and two of g. barbadense were examined for resistance to meloidogyne incognita race 3 and rotylenchulus reniformis in environmental growth chamber experiments, with the objective of finding new sources of resistance. only the g. barbadense accessions, tx-1347 and tx-1348, supported significantly less reproduction by r. reniformis than the susceptible control, deltapine 16 (usda accession sa-1186). however, they were highly susceptible to m. incognita race 3. t ... | 1997 | 19274280 |
| meloidogyne incognita infested soil amended with chicken litter. | the effects of chicken litter on meloidogyne incognita in cotton, gossypium hirsutum cv. dpl50 were determined in field microplots. litters (manure and pine-shaving bedding) from a research facility and a commercial broiler house were used. treatments consisted of 0.25%, 0.5%, and 1% litter by dry weight of soil for each kind of litter. three control treatments consisted of soil not amended with litter, with and without nematodes, and one treatment to which mineral fertilizer was added at a nitr ... | 1996 | 19277155 |
| impact of soil texture on the reproductive and damage potentials of rotylenchulus reniformis and meloidogyne incognita on cotton. | the effects of soil type and initial inoculum density (pi) on the reproductive and damage potentials of meloidogyne incognita and rotylenchulus reniformis on cotton were evaluated in microplot experiments from 1991 to 1993. the equilibrium nematode population density for r. reniformis on cotton was much greater than that of m. incognita, indicating that cotton is a better host for r. reniformis than m. incognita. reproduction of m. incognita was greater in coarse-textured soils than in fine-text ... | 1996 | 19277171 |
| frequency and geographical distribution of plant-parasitic nematodes on cotton in georgia. | a survey was conducted to examine the geographical distribution of plant-parasitic nematodes in georgia cotton fields. a total of 778 fields in 11 georgia counties were sampled from 1 september through 15 december 1995. four nematode genera parasitic on cotton were found in this survey: meloidogyne spp., rotylenchulus sp., hoplolaimus sp., and belonolaimus sp. meloidogyne spp. was present in 9% to 56% of the fields in individual counties. rotylenchulus sp. was found in 10 counties, hoplolaimus s ... | 1996 | 19277192 |
| influence of meloidogyne incognita on the water relations of cotton grown in microplots. | the effects of meloidogyne incognita on the growth and water relations of cotton were evaluated in a 2-year field study. microplots containing methyl bromide-fumigated fine sandy loam soil were infested with the nematode and planted to cotton (gossypium hirsutum l.). treatments included addition of nematodes alone, addition of nematodes plus the insecticide-nematicide aldicarb (1.7 kg/ha), and an untreated control. meloidogyne incognita population densities reached high levels in both treatments ... | 1995 | 19277313 |
| effect of tropical rotation crops on meloidogyne incognita and other plant-parasitic nematodes. | in a field experiment conducted on sandy soil in florida during the 1993 season, rotation crops of castor (ricinus communis), velvetbean (mucuna deeringina), 'mississippi silver' cowpea (vigna unguiculata), american jointvetch (aeschynomene americana), 'dehapine 51' cotton (gossypium hirsutum), and 'sx-17' sorghum-sudangrass (sorghum bicolor x s. sudanense) were effective in maintaining low population densities (<12/100 cm(3) soil) of meloidogyne incognita race 1, whereas high population densiti ... | 1995 | 19277319 |
| damage functions and population changes of hoplolaimus columbus on cotton and soybean. | damage functions and reproductive curves were determined for hoplolaimus columbus on cotton cv. deltapine 90 and soybean cv. gordon over 2 years in field plots in georgia. maximum potential yield suppressions of 18% on cotton and 48% on soybean were predicted with respect to increasing pi. similar functions indicated yield suppressions of 38% on cotton and 30% on soybean with respect to increasing midseason nematode densities (pm). maximum pf predicted by reproductive curves were 123 and 474/100 ... | 1993 | 19279792 |
| effects of 1,3-dicliloropropene for meloidogyne incognita management on cotton produced under furrow irrigation. | field trials were conducted during 1990 to evaluate the effects of preplant soil fumigation with 1,3-dichloropropene (1,3-d) on yield and fiber quality of furrow-irrigated cotton cultivars subjected to high population densities of meloidogyne incognita. we measured the responses of eight upland cotton cultivars with different levels of root-knot nematode resistance and compared the responses of upland and pima cottons. reductions in lint weight ranged from 10 to 52% among cultivars grown in soil ... | 1993 | 19279835 |
| meloidogyne incognita and rotylenchulus reniformis and associated soil textures from some cotton production areas of texas. | the incidence of meloidogyne incognita and rotylenchulus reniformis on cotton was determined in 1989-92 from 1,089 soil samples collected from 31 counties that account for nearly 60% of the 2.2 million hectares planted to cotton in texas. meloidogyne incognita was commonly found in the southern high plains and brazos river valley regions of texas (57% and 34%, respectively, of samples) but was found in less than 8% of samples from the central blacklands, coastal bend, low plains, or the upper gu ... | 1993 | 19279860 |
| effects of tropical rotation crops on meloidogyne arenaria population densities and vegetable yields in microplots. | the effects of 12 summer crop rotation treatments on population densities of meloidogyne arenaria race 1 and on yields of subsequent spring vegetable crops were determined in microplots. the crop sequence was: (i) rotation crops during summer 1991 ; (ii) cover crop of rye (secale cereale) during winter 1991-92; (iii) squash (cucurbita pepo) during spring 1992; (iv) rotation crops during summer 1992; (v) rye during winter 1992-93; (vi) eggplant (solanum melongena) during spring 1993. the 12 rotat ... | 1994 | 19279880 |
| interrelationships of rotylenchulus reniformis with rhizoctonia solani on cotton. | the interrelationships between reniform nematode (rotylenchulus reniformis) and the cotton (gossypium hirsutum) seedling blight fungus (rhizoctonia solani) were studied using three isolates of r. solani, two populations of r. reniformis at multiple inoculum levels, and the cotton cultivars dehapine 90 (dp 90) and dehapine 41 (dp 41). colonization of cotton hypocotyl tissue by r. solani resulted in increases (p </= 0.05) in nematode population densities in soil and in eggs recovered from the root ... | 1994 | 19279918 |
| influence of rhizoctonia solani on egg hatching and infectivity of rotylenchulus reniformis. | the effects of culture filtrates of rhizoctonia solani and root exudates of r. solani-infected cotton (gossypium hirsutum) seedlings on hatching of eggs and infectivity of females of rotylenchulus reniformis were evaluated in an attempt to account for the enhanced nematode reproduction observed in the presence of this fungus. crude filtrates of r. solani cultures growing over sterile, deionized distilled water did not affect egg hatching. exudates from roots of cotton seedlings increased hatchin ... | 1994 | 19279919 |
| rotations with coastal bermudagrass, cotton, and bahiagrass for management of meloidogyne arenaria and southern blight in peanut. | the efficacy of coastal bermudagrass (cynodon dactylon) as a rotation crop for controt of root-knot nematode (meloidogyne arenaria) in 'florunner' peanut (arachis hypogoea) was evaluated in a 3-year field trial. coastal bermudagrass-peanut rotation (cbp) was compared with peanut monoculture without nematicide (p - ) and peanut monoculture with aldicarb (p + ). the performance of cbp was also compared with 'pensacola' bahiagrass (paspalum notatum)-peanut (bp), and 'deltapine 90' cotton (gossypium ... | 1994 | 19279945 |
| plant-parasitic nematodes associated with cotton in florida. | a sampling of 15% of the cotton hectarage in each florida county was assayed for nematodes and soil particle components following the 1990 harvest. the distribution of juveniles of meloidogyne spp., which were found in 61% of the 178 fields sampled statewide, was not influenced by soil type. rotylenchulus reniformis was more prevalent in the heavier soils and occurred in 15% of the sampled fields. in fields with concomitant infestations (9% of the sampled fields), densities of root-knot juvenile ... | 1994 | 19279958 |
| survey of plant-parasitic nematodes in missouri cotton fields. | during september 1990, 30 cotton fields in each of three missouri counties were surveyed for plant-parasitic nematodes. soil samples for nematode analysis consisted of a composite of 20 cores collected in a zig-zag pattern within a 1-ha block in each field. cores were taken from within weed-free cotton rows. nine genera of plant-parasitic nematodes were found (rotylenchulus, helicotylenchus, hoplolaimus, meloidogyne, paratylenchus, pratylenchus, tylenchorhynchus, heterodera, and trichodorus), an ... | 1992 | 19283062 |
| maximizing the potential of cropping systems for nematode management. | quantitative techniques were used to analyze and determine optimal potential profitability of 3-year rotations of cotton, gossypium hirsutum cv. coker 315, and soybean, glycine max cv. centennial, with increasing population densities of hoplolaimus columbus. data collected from naturally infested on-farm research plots were combined with economic information to construct a microcomputer spreadsheet analysis of the cropping system. nonlinear mathematical functions were fitted to field data to rep ... | 1991 | 19283139 |
| interaction of meloidogyne incognita and water stress in two cotton cultivars. | a series of controlled-environment experiments were conducted to elucidate the effects of meloidogyne incognita on host physiology and plant-water relations of two cotton (gossypium hirsutum) cultivars that differed in their susceptibility to nematode infection. inoculation of m. incognita-resistant cultivar auburn 634 did not affect growth, stomatal resistance, or components of plant-water potential relative to uninoculated controls. however, nematode infection of the susceptible cultivar stone ... | 1991 | 19283156 |
| cotton as a rotation crop for the management of meloidogyne arenaria and sclerotium rolfsii in peanut. | the value of cotton (gossypium hirsutum cv. deltapine 90) in rotation with peanut (arachis hypogaea cv. florunner) for the management of root-knot nematode (meloidogyne arenaria) and southern blight (sclerotium rolfsii) was studied for 6 years in a field at the wiregrass substation in southeast alabama. peanut yields following either 1 or 2 years of cotton (c-p and c-c-p, respectively) were higher than those of peanut monoculture without nematicide [p(-)]. at-plant application of aldicarb to con ... | 1991 | 19283179 |
| progression of root-knot nematode symptoms and infection on resistant and susceptible cottons. | progressive development in cotton root morphology of resistant a623 and susceptible m-8 cotton (gossypium hirsutum l.) lines following infection by the root-knot nematode meloidogyne incognita was studied in glass front boxes. symptom development and radicle growth were observed; degree of galling, gall and egg mass diameter, and number of eggs per egg mass were recorded; and root segments were examined histologically. small cracks caused by m. incognita appeared in the root epidermis and cortex ... | 1989 | 19287602 |
| influence of environmental factors on the hatch and survival of meloidogyne incognita. | the influence of soil temperature and moisture on meloidogyne incognita (kofoid and white) chitwood was examined in relation to hatching and survival of second-stage juveniles (j2). nematodes were cultured on cotton (gossypium hirsutum l. cv. acala sj2) under field conditions to provide populations similar to those found in the field in late autumn. egg masses were placed in a temperature range (9-12 c and 21 c), and hatch was measured over a period equivalent to 20 degree days > 10 c (dd10). ha ... | 1989 | 19287616 |
| phytoparasitic nematode surveys of arkansas cotton fields, 1986-1988. | surveys from 1986 to 1988 identified 22 phytoparasitic nematode species in arkansas cotton fields. meloidogyne spp. was found in ca. 15% of the fields sampled. of these samples ca. 33% were found to have a population density of 106/100 cm(3) of soil or more. rotylenchulus reniformis was found in high numbers (5,000 +/100 cm(3) of soil) in 1% of the fields sampled in 1988. heterodera glycines was found in ca. 22% of the samples, presumably because of past cropping to soybean. other common species ... | 1989 | 19287659 |
| crops uncommon to alabama for the management of meloidogyne arenaria in peanut. | in a 1987 field study juveniles of meloidogyne arenaria assayed at the time of peanut harvest were almost undetectable in plots planted with american jointvetch (aeschynomene americana), castor bean (ricinus communis), partridge pea (cassia fasiculata), sesame (sesamum indicum), and cotton (gossypium hirsutum), whereas plots with peanut (arachis hypogaea) averaged 120 juveniles/100 cm(3) soil. application of aldicarb in peanut resulted in an average of 27 juveniles/100 cm(3) soil. in 1988 all pl ... | 1989 | 19287678 |
| chemical control of hoplolaimus columbus on cotton and soybean. | seven experiments, three on soybean and four on cotton, were conducted in hoplolaimus columbus-infested soil in southern north carolina to determine the benefits of chemical soil treatment. locations were selected to give a range of initial population (pi) densities. soil fumigation with 1,3-d and soil treatment with a combination of aldicarb plus fenamiphos (1.1 kg a.i./ha) each provided good control of this nematode. yield responses considered to be significant were achieved only on the high p ... | 1990 | 19287781 |
| response of rotylenchulus reniformis to nematicide applications on cotton. | field experiments were conducted to evaluate the efficacy of five nematicides for the management of rotylenchulus reniformis and for their effects on growth, development, and yield of cotton. treatments included 1,3-dichloropropene (1,3-d), fenamiphos, phorate, terbufos, aldicarb, and 1,3-d + aldicarb. average r. reniformis population densities across all treatments increased from 5,284 at 10 days after planting to a final density at harvest of 15,622 nematodes/500 cm(3) soil. the 1,3-d + aldica ... | 1990 | 19287784 |
| efficacy of fumigant nematicides to control hoplolaimus columbus on cotton. | four rates of methyl bromide (mbr) (16.8, 33.6, 67,2, and 134.4 kg a.i./ha) and one rate of 1,3-dichloropropene (1,3-d) (28.1 liters a.i./ha) were evaluated over 2 years for control of hoplolaimus columbus on cotton. all nematicide treatments were applied through a tarpless subsoiler-bedder prior to planting cotton, gossypium hirsutum cv. dehapine 90. nematode population densities were monitored before and after treatment, at midseason, and at harvest, and yields were measured at maturity. soil ... | 1990 | 19287786 |
| peanut-cotton rotations for the management of meloidogyne arenaria. | the efficacy of 'deltapine 90' cotton (gossypium hirsutum) in rotation with 'florunner' peanut (arachis hypogaea) for the management of meloidogyne arenaria was studied for 2 years in a field in southeastern alabama. in 1985, m. arenaria juvenile populations in plots with cotton were 98% lower than in plots with peanut. peanut and cotton yields were increased by treatment with aldicarb (3.3 kg a.i./ha in a 20-cm-band) in 1985 but not in 1986. in 1986, peanut yields were highest and m. arenaria j ... | 1987 | 19290174 |
| effect of combining soil solarization with certain nematicides on target and nontarget organisms and plant growth. | field experiments compared pesticidal and plant growth effects of soil solarization, alone and in combination, with overall applications of several nematicides. nematodes, including meloidogyne incognita j2, that were targeted for control were significantly reduced (p < 0.05) by solarization, 1,3-dichloropropene (44 and 132 liter/ha), ethoprop (13.5 kg/ha), metham sodium (64 liter/ha), formaldehyde (111 liter/ha), and by solarization-nematicide combinations. control of pythium ultimum also was o ... | 1987 | 19290287 |
| comparative resistance of selected acala 1517 cotton cultivars to meloidogyne incognita race 3. | little information is available regarding the levels of meloidogyne incognita race 3 resistance in acala 1517 cotton cultivars compared with cultivars grown outside the southwestern united states. levels of m. incognita egg production were compared among commercial acala cultivars 1517-e2, 1517-sr1, 1517-75, 1517-77br, and sj-5, resistant and susceptible standards auburn 634 and m-8 and breeding lines acala 5701-w and n6072 grown for 45 days in the greenhouse. the acala 1517 cultivars all perfor ... | 1987 | 19290288 |
| response of cotton to infection by hoplolaimus columbus. | three field experiments were established in 1987 to determine the reaction of five cotton cultivars to infection by hoplolaimus columbus and the efficacy of selected nematicides against this nematode. at two sites in calhoun county, south carolina, early season plant growth and subsequent yields were greater in plots treated with aldicarb, fenamiphos, and 1,3-dichloropropene. hoplolaimus columbus suppressed yields approximately 10% at site 1 and 25% at site 2; however, greater yield suppression ... | 1988 | 19290310 |
| potential of crops uncommon to alabama for management of root-knot and soybean cyst nematodes. | vigna unguiculata, cassia fasiculata, and sesamum indicum did not support meloidogyne arenaria, m. incognita, or heterodera glycines race 4 in greenhouse studies with soils from peanut and soybean fields. fagopyron eseulentum, cyamopsis tetragonoloba, and cucurbita pepo were hosts to the two meloidogyne spp. but were nonhosts to h. glycines. meloidogyne arenaria and m. incognita galled but reproduced poorly in the roots of three types of amaranthus cruentus, and low densities of these two meloid ... | 1988 | 19290317 |
| crop rotation and races of meloidogyne incognita in cotton root-knot management. | the influence o f various crop rotations and nematode inoculum levels on subsequent population densities of meloidogyne incognita races 1 and 3 were studied in microplots. ten different 3-year sequences o f cotton, corn, peanut, or soybean, all with cotton as the 3rd-year crop, were grown in microplots infested with each race. cotton monoculture, two seasons o f corn, or cotton followed by corn resulted in high race 3 population densities and severe root galling on cotton the 3rd year. peanut fo ... | 1984 | 19294030 |
| penetration and postinfection development of meloidogyne incognita on cotton as affected by glomus intraradices and phosphorus. | the influence of the vesicular-arbuscular mycorrhizal fungus glomus intraradices (gi) and superphosphate (p) on penetration, development, and reproduction of meloidogyne incognita (mi) was studied on the mi-susceptible cotton cultivar stoneville 213 in an environmental chamber at 28 c. plants were inoculated with mi eggs at planting or after 28 days and destructively sampled 7, 14, 21, and 28 days after nematode inoculation. mi penetration after 7 days was similar in all treatments at either ino ... | 1986 | 19294207 |
| influence of soil temperature on meloidogyne incognita resistant and susceptible cotton, gossypium hirsutum. | the degree of resistance by a cotton plant to meloidogyne incognita is affected by soil temperature, particularly in moderately resistant cultivars, the total number of nematodes in the resistant and moderately resistant rools at 35 c was equal to, or greater than, the number in susceptible roots at 20, 25, or 30 c. a shift in numbers to developing and egg-bearing forms of nematodes in the susceptible cultivar as tentperature increased indicates development was affected by temperature rather tha ... | 1982 | 19295718 |
| parasitic variability of meloidogyne incognita populations on susceptible and resistant cotton. | root gall induction and egg production by the four recognized host races and two cytological races of meloidogyne incognita were compared on cotton gossypium hirsutum cvs. deltapine 16 (root-knot susceptible) and auburn 634 (highly resistant). the 12 nematode populations included in the study were from various parts of the world. no population increases occurred on the highly resistant cultivar. after 45 days, populations of host races 1 and 2 induced slight root galling on both cuhivars with on ... | 1983 | 19295806 |
| resistant germplasm in gossypium species and related plants to rotylenchulus reniformis. | gossypium hirsutum, g. herbaceum, g. arboreum, g. barbadense, wild gossypium spp., hibiscus spp, and other malvaceae were tested in the greenhouse to identify germplasm resistant to rotylenchulus reniformis (rr). host resistance was based on rr egg production per gram of root compared with known g. hirsutum susceptible 'deltapine 16' as check. g. longicalyx and sida rhombifolia were nonhosts. high levels of resistance were found in g. stocksii, g. somalense, and g. barbadense 'texas 110.' other ... | 1984 | 19295892 |
| nematicides and nonconventional soil amendments in the management of root-knot nematode on cotton. | granular and liquid commercial humates, with micronutrients, and a microbial fermentation product were compared in several combinations with nematicides for their effects on cotton lint yield and root-knot nematode suppression. fumigant nematicides effectively reduced cotton root galling caused by root-knot nematodes, and cotton lint yields increased. organophosphates and carbamates were not effective. occasionally, cotton lint yields were increased or maintained with combination treatments o f ... | 1984 | 19295893 |
| influence of aphelenchus avenae on vesicular-arbuscular endomycorrhizal growth response in cotton. | the influence of aphelenchus avenae on the relationship between cotton (gossypium hirsutum 'stoneville 213') and gigaspora margarita or glomus etunicatus was assessed by its effect on the mycorrhizal stimulation of plant growth and microorganism reproduction. the mycophagous nematode usually did not suppress stimulation of shoot growth resulting from mycorrhizae (g. margarita) at inoculum levels of 3,000 or 6,000 nematodes per pot, but retarded root growth at 6,000 per pot. when the nematode ino ... | 1981 | 19300721 |
| interaction of population levels of fusarium oxysporum f. sp. vasinfectum and meloidogyne incognita on cotton. | in autoclaved greenhouse soil without fusarium oxysporum f. sp. vasinfectum, meloidogyne incognita did not cause leaf or vascular discoloration of 59-day-old cotton plants. plants had root galls with as few as 50 meloidogyne larvae per plant. root galling was directly proportional to the initial nematode population level. fusarium wilt symptoms occurred without nematodes with 77,000 fungus propagules or more per gram of soil. as few as 50 meloidogyne larvae accompanying 650 fungus propagules cau ... | 1979 | 19305546 |
| granular nematicides as adjuncts to fumigants for control of cotton root-knot nematodes. | growth and yield of cotton were best with combinations of fumigants and organophosphate and carbamate nematicides. organophosphates or carbamates used alone did not give season-long control of root-knot nematodes. long-term control was poor because the temporary sublethal effects of these materials diminished soon enough lhat the nematodes could reproduce. the nematodes survived the treatments and a year of nonhost culture, and damaged a susceptible host crop 2 years after treatment. no such dam ... | 1979 | 19305548 |
| effects of subsoiling and nematicides on hoplolaimus columbus populations and cotton yield. | subsoiling to a depth of 35 cm under the planting row for 3 consecutive years increased annual yields of seed cotton by 50 to 200%. annual subsoiling was essential for maximum yields. the application of a nematicide, 1,2-dibromo-3-chloropropane (dbcp) or aldicarb, reduced the population of hoplolaimus columbus but did not increase seed-cotton yields over subsoiling alone. subsoiling reduced h. columbus in the top 20 cm of soil since the treatment favored deeper penetration by much of the root sy ... | 1977 | 19305573 |
| 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 |
| interaction of pratylenchus brachyurus and gigaspora margarita on cotton. | an endomycorrhizal fungus, gigaspora margarita, was more effective in stimulating the growth of cotton (gossypium hirsutum) 'coker 201' at a low fertility level (1.77 gm 10-10-10 n-p-k/pot) than doubling the fertility rate for nonmycorrhizal plants. gigaspora margarita alone stimulated shoot growth (height, weight, and flower production by 96%, 553%, and 760%, respectively) and root growth (385%) over that of nonmycorrhizal controls at low fertility. plant development was also stimulated by g. m ... | 1978 | 19305806 |
| seasonal population dynamics of selected plant-parasitic nematodes on four monocultured crops. | seasonal fluctuations in field populations of meloidogyne incognita, pratylenchus zeae, p. brachyurus, criconemoides ornatus, trichodorus christiei, and helicotylenchus dihystera on monocultured corn, cotton, peanut, and soybean were determined monthly for 4 yr. population densities of m. incognita were greater in corn and cotton plots than in peanut and soybean plots from july until january. those of pratylenchus spp. were greater on corn and soybean than on cotton and peanut during all months ... | 1974 | 19308120 |
| dynamics of concomitant field populations of hoplolaimus columbus and meloidogyne incognita. | from the fall of 1968 through the summer of 1973, a georgia cotton field with a lengthy history of the cotton stunt disease complex was sampled for the presence of plant parasitic nematodes. although meloidogyne incognita was recovered on all sampling dates, concomitant populations of hoplolaimus columbus were not recovered until the spring of 1970. during the succeeding four growing seasons, the population density and horizontal distribution of h. columbus increased, and h. columbus replaced m. ... | 1974 | 19308121 |
| 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 |
| crop rotation and herbicide effects on population densities of plant-parasitic nematodes. | the influence of herbicides and mono- and multicropping sequences on population densities of nematode species common in corn, cotton, peanut, and soybean fields in the southeastern united states was studied for 4 years. each experimental plot was sampled at monthly intervals. the application of herbicides did not significantly affect nematode population densities. meloidogyne incognita and trichodorus christiei increased rapidly on corn and cotton, but were suppressed by peanut and soybean. more ... | 1975 | 19308149 |
| effects of soil temperatures and inoculum levels of meloidogyne incognita and rhizoctonia solani on seedling disease of cotton. | soreshin of cotton was more severe from combined infections of rhizoctonia solani and meloidogyne incognita than from either organism alone, when both critical soil temperature and inoculum concentrations were present. optimum soil temperatures for disease development from combined infections were 18 and 21 c. either 2,500 or 5,000 m. incognita larvae per plant, combined with r. solani, increased seedling disease severity over that caused by r. solani alone. when 100 or 500 larvae per plant were ... | 1975 | 19308161 |
| effects of soil texture on the interaction between rhizoctonia solani and meloidogyne incognita on cotton seedlings. | soils containing 60, 75, and 90% coarse particles (sand plus coarse silt) were prepared by dilution of a field soil with 246microm (60-mesh) silica sand. as the coarse-particle content of the soils increased, the synergistic interaction between meloidogyne incognita and rhizoctonia solani on cotton seedlings increased. increasing the coarse-particle content of the soil also increased damage from the nematode alone and slightly increased soreshin damage from r. solani alone. | 1975 | 19308162 |
| effects of light intensity and quality effects on reproduction of plant-parasitic nematodes. | growing cotton in a greenhouse with 12-h of supplemental light [8,608 lux (800 ft-c) from combination of mercury and lucalux lamps] resulted in 2 x to > 3 x greater reproduction of meloidogyne incognita and belonolaimus longicaudatus as compared to natural light alone. rate of increase of hoplolaimus galeatus was affected little in this experiment. in a second experiment under controlled conditions in a phytotron, light source and intensity had greater influence on the reproduction of heterodera ... | 1975 | 19308183 |
| interactions of concomitant species of nematodes and fusarium oxysporum f. sp. vasinfectum on cotton. | meloidogyne incognita, hoplolaintus galeatus, and north carolina and georgia populations of belonolaimus longicaudatus were introduced singly and in various combinations with fusarium oxysporum f. sp. vasinfectum on wilt-susceptible 'rowden' cotton. of all the nematodes, the combination of the n. c. population of b. longicaudatus with fusarium promoted greatest wilt development. h. galeatus had no effect on wilt. with fusarium plus m. incognito or b. longicaudatus, high nematode levels promoted ... | 1976 | 19308201 |
| the influence of trichoderma harzianum on the root-knot fusarium wilt complex in cotton. | wilt-susceptible cultivar 'rowden' cotton was inoculated wilh meloidogyne incognita (n), trichoderma harzianum (t), and fusarium oxysporum f. sp. vasinfectum (f) alone and in all combinations in various time sequences. plants inoculated with f alone or in combination with t did not develop wilt, simultaneous inoculation of 7-day-old seedlings with all three organisms (ntf) produced earliest wilt. however, plants receiving nematodes at 7 days and fusarium and trichoderma at 2 or 4 weeks later (n- ... | 1976 | 19308202 |
| the myb transcription factor ghmyb25 regulates early fibre and trichome development. | little is still known about the developmental control of the long seed coat trichomes of cotton (gossypium hirsutum l.). in arabidopsis, leaf trichome initiation is regulated by a group of well-defined transcription factors that includes myb and homeodomain types. many mybs are expressed in fibres, but their roles in fibre development remain unclear. we analysed the function of one myb transcription factor, ghmyb25, identified from transcriptome comparisons between wild-type and fibreless cotton ... | 2009 | 19309462 |
| influence of concomitant pratylenchus brachyurus and meloidogyne spp. on root penetration and population dynamics. | populations of pratylenchus brachyurus on cotton were increased significantly in the presence of either meloidogyne incognita or m. arenaria.this occurred with either simultaneous inoculation or prior invasion by m. incognita. p. brachyurus penetrated cotton roots previously invaded by, or simultaneously inoculated with, m. incognita, as well as, or better than, in the absence of m. incognita. prior invasion by m. incognita, however, suppressed p. brachyurus populations on tomato, while it had n ... | 1973 | 19319334 |
| inhibition of rotylenchulus reniformis penetration of tomato and cotton roots with foliar applications of oxamyl. | foliar applications of oxamyl (methyl n', n'-dimethyl-n-[(methylcarbamoyl)oxy]-l-thiooxamimidate) were applied 24 hr before transplanting seedlings to soil infested with rotylenchulus reniformis. with a single application of oxamyl, tomato seedlings required 600 ppm to significantly inhibit r. reniformis penetration. cotton seedlings, however, required a single application of 2400 ppm for significant inhibition of penetration, but only 600 ppm when two or more applications were used. | 1973 | 19319336 |
| 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 |