Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| quantitative requirements for tyrosine, phenylalanine and tryptophan by the cotton aphid, aphis gossypii (glover). | 1977 | 11934 | |
| uptake of monocrotophos by chrysanthemum cultivars and resulting control of melon aphid. | 1974 | 4833484 | |
| the integration of chemical control of the melon aphid with predatory control of glasshouse red spider mite on cucumbers. | 1971 | 5133522 | |
| [reaction of the aphid aphis gossypii glov. on variations in the physical condition of the cotton plant]. | 1970 | 5457498 | |
| [reaction of the aphid aphis gossypii glov. to the physiological status of the cotton plant]. | 1970 | 5480191 | |
| mapping determinants in cucumber mosaic virus for transmission by aphis gossypii. | determinants have been mapped in the coat protein of cucumber mosaic virus (cmv) which influence transmission by the aphid aphis gossypii. chimeric rna 3s were constructed which contain sequences from the efficiently aphid-transmitted strain fny-cmv and the very poorly aphid-transmissible m-cmv. analyses of chimeric viruses revealed that two regions in the coat protein were critical for transmission by aphids. the coat proteins of fny- and m-cmv were previously shown to differ at eight amino aci ... | 1994 | 7975263 |
| nucleotide sequence of the coat protein gene of citrus tristeza virus: comparison of biologically diverse isolates collected in israel. | the sequences of the coat protein genes of four seedling yellows (sy) and four non-sy (nsy) of citrus tristeza virus (ctv) isolates, which were collected in israel over a period of 30 years, were analyzed. pairwise comparisons showed extensive similarities in the nucleotide and amino acid sequences of six isolates designated the vt group. this group consists of three nsy isolates that cause a very mild ctv reaction on the sensitive combination of sweet orange (swo) grafted on sour orange (so), a ... | 1993 | 8279125 |
| synthesis of a full-length infectious cdna clone of cucurbit aphid-borne yellows virus and its use in gene exchange experiments with structural proteins from other luteoviruses. | a full-length cdna of cucurbit aphid-borne yellows virus (cabyv) has been constructed and expressed either as an in vitro transcript, under control of a bacteriophage t7 rna polymerase promoter, or in vivo, under control of the cauliflower mosaic virus 35s promoter in an agroinfection vector. the biological activity of the cloned cdna was demonstrated by the ability of its in vitro transcript to replicate in protoplasts and of the agroinfection vector to infect agroinoculated plants. virus in th ... | 1995 | 8525610 |
| simultaneous detection and typing of plum pox potyvirus (ppv) isolates by heminested-pcr and pcr-elisa. | two techniques for simultaneous detection and typing of plum pox potyvirus (ppv) isolates belonging to the d or m serotypes, heminested pcr (h-pcr) and pcr-elisa, have been developed. ten ppv isolates typed using ppv-d and ppv-m specific monoclonal antibodies by elisa-dasi were used to validate these two methods. the results obtained show a complete coincidence of the nucleic acid-based techniques with the serological data. when serial dilutions of infected plant extracts were assayed, h-pcr and ... | 1997 | 9389402 |
| amino acid changes in the coat protein of cucumber mosaic virus differentially affect transmission by the aphids myzus persicae and aphis gossypii. | cucumber mosaic virus (cmv) transmission by two aphid species was investigated using strains of the virus with modified coat proteins. chimeric viral rna 3 cdna constructs were designed with coat protein-encoding sequences from the efficiently aphid-transmitted fny-cmv and the very poorly aphid-transmitted m-cmv. different regions of the viral coat protein variably influenced transmission; the magnitude of effects depended on the aphid species used as vector. five amino acid changes in the coat ... | 1998 | 9501042 |
| insecticidal, acaricidal and synergistic effects of soosan, pancratium maritimum extracts and constituents. | in assessing the pesticidal activity of soosan, p. maritimum, the bulbs and leaves were extracted using acetone/ethanol & ethanol as solvents and mosquito larvae c. pipiens, as a test organism. the actone/ethanol extract of bulbs was more toxic (lc50: 25 ppm) than that of the leaves (lc50: 75 ppm). crude alkaloids, lycorine, terpenes & sterols and fixed oil were isolated from soosan bulb. their percentages were: 0.193, 0.02, 0.13 and 3.3%, respectively. the acetone/ethanol extract showed a stron ... | 1998 | 9617056 |
| role of the helper component in vector-specific transmission of potyviruses. | four aphid species were tested for their ability to transmit tobacco etch (tev) and turnip mosaic (tumv) potyviruses. myzus persicae and aphis gossypii transmitted both viruses efficiently from infected plants, whereas lipaphis erysimi transmitted only tumv and myzus ascalonicus was a poor or non-transmitter of either virus. similar electrically monitored probing patterns were produced by m. persicae, l. erysimi and m. ascalonicus, ruling out behavioural differences as the cause of differential ... | 1998 | 9634096 |
| characterization of microsatellite loci in the aphid species aphis gossypii glover. | 1999 | 10327667 | |
| variation in clonal diversity in glasshouse infestations of the aphid, aphis gossypii glover in southern france. | aphis gossypii is an aphid species that is found throughout the world and is extremely polyphagous. it is considered a major pest of cotton and cucurbit species. in europe, a. gossypii is assumed to reproduce exclusively by apomictic parthenogenesis. the present study investigates the genetic diversity of a. gossypii in a microgeographic, fragmented habitat consisting of eight glasshouses of cucurbit crops. this analysis, which was based on the results from seven microsatellite loci, has confirm ... | 1999 | 10620230 |
| effects of temperature and dietary sucrose concentration on respiration in the silverleaf whitefly, bemisia argentifolii. | a system consisting of a flow-through chamber connected to a commercial infrared gas analysis system was developed to measure homopteran respiration during feeding. using this system, respiration rates of 202 and 206 µmol co(2) h(-1) g(-1) (4.96 and 5.04 ml co(2) h(-1) g(-1)) were determined for whiteflies and cotton aphids, respectively, at 25 degrees c on diets containing 15% sucrose. these rates were considerably higher than those of other stationary insects, indicating that whiteflies and ap ... | 2000 | 10891574 |
| effect of fungicide application on activity of neozygites fresenii (entomophthorales: neozygitacaea) and cotton aphid (homoptera: aphididae) suppression. | the development of resistance in aphid populations highlights the importance of biological control as a pest management tactic. four treatments were evaluated to determine the effects of pesticides on the population dynamics of aphis gossypii glover and neozygites fresenii (nowakowski) batko: (1) weekly applications of the insecticide imidacloprid (provado 1.6 f); (2) weekly applications of the fungicide chlorothalonil (bravo 720); (3) applications of imidacloprid (provado 1.6 f) when aphid dens ... | 2000 | 10985021 |
| cucumber mosaic virus mutants with altered physical properties and defective in aphid vector transmission. | two mutant strains of cucumber mosaic virus (cmv) were investigated with respect to virion stability and molecular determinants of aphid vector transmission. the mutant 2a1-mt-60x, derived from the mechanically passaged wild type 2a1-at, is poorly transmissible by the aphid aphis gossypii and not transmissible by the aphid myzus persicae, whereas the wild type virus is transmissible by both aphid species. the mutant phenotype was shown to be conferred by a single encoded amino acid change of ala ... | 2000 | 11040130 |
| incidence and epidemiology of citrus tristeza virus in the valencian community of spain. | the first outbreak of citrus tristeza disease in spain caused by citrus tristeza virus (ctv) was recorded in 1957 in the valencian community (vc). in total c. 40 million trees, mainly of sweet orange and mandarin grafted on sour orange rootstocks, declined due to ctv. large-scale surveys in different municipalities of the vc indicated that the disease spread very fast. incidence increased from 11% in 1989 to 53% in 1998. toxoptera aurantii and aphis spiraecola (inefficient aphid vectors of ctv) ... | 2000 | 11137164 |
| effect of selected insecticides on the natural enemies coleomegilla maculata and hippodamia convergens (coleoptera: coccinellidae), geocoris punctipes (hemiptera: lygaeidae), and bracon mellitor, cardiochiles nigriceps, and cotesia marginiventris (hymenoptera: braconidae) in cotton. | we evaluated the toxicity of three insecticides (lambda cyhalothrin, spinosad, and s-1812) to the natural enemies bracon mellitor say, cardiochiles nigriceps viereck, coleomegilla maculata de geer, cotesia marginiventris (cresson), geocoris punctipes (say), and hippodamia convergens guérin-méneville, in topical, residual, and field assays. lambda cyhalothrin exhibited the greatest toxicity to the natural enemies. in topical toxicity tests, lambda cyhalothrin adversely affected each natural enemy ... | 2000 | 11142293 |
| effect of nitrogen fertilization on aphis gossypii (homoptera: aphididae): variation in size, color, and reproduction. | the effect of nitrogen fertilization on aphis gossypii glover color and size, fertility, and intrinsic rate of increase (rm) was studied on cotton plants. nitrogen fertilization treatments consisted of 0, 50, 100, and 150% of the agronomic recommended level. adult and nymph densities, as well as rm, were positively correlated with nitrogen fertilization. aphid body length, head width, and darkness of color were recorded in populations on cotton plants fertilized with 100% nitrogen or with no nit ... | 2001 | 11233124 |
| alkaline phosphatase activity in whitefly salivary glands and saliva. | alkaline phosphatase activity was histochemically localized in adult whiteflies (bemisia tabaci b biotype, syn. b. argentifolii) with a chromogenic substrate (5-bromo-4-chloro-3-indolylphosphate) and a fluorogenic substrate (elf-97). the greatest amount of staining was in the basal regions of adult salivary glands with additional activity traced into the connecting salivary ducts. other tissues that had alkaline phosphatase activity were the accessory salivary glands, the midgut, the portion of ... | 2001 | 11304750 |
| economic thresholds for aphis gossypii (hemiptera: aphididae) on citrus clementina. | different levels of aphis gossypii glover were maintained on clementine trees by means of isolation inside mesh cages. clementine yield loss was correlated with the number of aphids per square meter of canopy, obtaining the corresponding formula. starting from this formula, the economic injury level (eil) was calculated as follows: [218,333c + 11,130.6 vp0k]/[57.08 vp0k - 100c] = eil (aphids/m2), where c = total insecticide cost per hectare, v = fruit price per kilogram, p0 = yield per hectare o ... | 2001 | 11332836 |
| activity of the botanical aphicides 1,5-diphenyl-1-pentanone and 1,5-diphenyl-2-penten-1-one on two species of aphididnae. | 1,5-diphenyl-1-pentanone (a) and 1,5-diphenyl-2-penten-1-one (b) are natural products extracted for the first time from stellera chamaejasme. laboratory bioassay showed that the two products have strong contact activity and very good anti-feedant activity against aphis gossypii and schizaphis graminum. both products showed dose-dependent relationships for both forms of activity against the two aphids, the contact activity of b being about twice that of a. both products were inferior to methomyl ... | 2001 | 11455662 |
| [grey system analysis on dominant natural enemies influencing aphis gosspyii population]. | the populations of aphis gosspyii and its natural enemies before cotton boll stage were investigated systematically in 1983, 1984, 1986, 1988, 1994 and 1995. the relationship between daily total predation of natural enemies and aphis gosspyii population size was studied with the grey system theory and method, and the relational grade of various natural enemies to ideal superior natural enemies was analyzed. the results show that propylaca japonica was the major natural enemy influencing aphis go ... | 2000 | 11767645 |
| [geostatistical analysis on spatial patterns of aphis gossypii and propylaca japonica]. | the spatial construction and distribution of aphis gossypii and propylaca japonica at different period were investigated with geostatistics. the results showed that the semivariogram of aphis gossypii was described by spherical model, indicating an aggregated spatial arrangement, the range was 8.21-10.81 m. the semivariograms of propylaca japonica was fitted by spherical model too, also indicating an aggregated spatial arrangement, its range was 8.01-14.25 m. the amount and spatial distribution ... | 2000 | 11767646 |
| plant washing as a pest management technique for control of aphids (homoptera: aphididae). | changes in aphid presence following plant washings were evaluated on hibiscus plants, hibiscus rosa-sinensis l., that supported natural aphid infestations--primarily melon aphid, aphis gossypii clover. type of plant module (such as stems, tight buds, open flowers, and sepal caps) and percent of module's surface covered by aphids were recorded for each branch tip on every plant. plant washing was done with tap water, applied for 30 s three times a week for 3 wk. aphid presence was recorded each w ... | 2001 | 11777054 |
| [host plants of aphis gossypii (aphididae), vector of virus of cucumis melo melon (cucurbitaceae) in costa rica]. | plant species associated with commercial melon crops and surrounding areas were examined to identity the natural host plants of aphis gossypii glover. the study was conducted in two farms located in different melon production areas and plant life zones of costa rica. plant species diversity, percent coverage and distribution over time were recorded during one year. differences between locations were observed. a total of 86 plant species (49 families) and 72 plant species (40 families) were ident ... | 2001 | 11795159 |
| translocation and translaminar bioavailability of two neonicotinoid insecticides after foliar application to cabbage and cotton. | a laboratory study was undertaken to investigate the leaf systemic properties and the translaminar aphicidal activity of two commercialised neonicotinoid (chloronicotinyl) insecticides. for that purpose [14c]imidacloprid was subjected to uptake and translocation studies in cabbage and cotton after foliar application. foliar penetration and short-term translocation patterns of imidacloprid were similar in both plant species. nevertheless imidacloprid penetrated twice as much into cabbage leaves a ... | 2002 | 11838278 |
| relationship between aphis gossypii (homoptera: aphididae) and sticky lint in cotton. | the study was conducted in the northern texas rolling plains in 1999 to define the relationship between number of cotton aphids, aphis gossypii glover, and resulting contamination of cotton lint by honeydew. whole-plot treatments were three furrow irrigation management treatments: cotton grown without supplemental irrigation (dryland), irrigated cotton with last irrigation in mid august, and irrigated cotton with last irrigation in late august. subplots within each irrigation treatment included ... | 2002 | 12020004 |
| resistance of aphis gossypii (homoptera: aphididae) to fenvalerate and imidacloprid and activities of detoxification enzymes on cotton and cucumber. | resistance of two strains of cotton aphid, aphis gossypii glover, to fenvalerate and imidacloprid were determined on cotton (gossypium hirsutum l.) and cucumber (cucumis sativa l.) after resistance selection of one strain to fenvalerate for 16 consecutive generations, and of a second strain to imidacloprid for 12 consecutive generations on cotton in greenhouses. dose-response and activities of detoxication enzymes of the fenvalerate-resistant strain (r-fenvalerate), the imidacloprid-resistant st ... | 2002 | 12020021 |
| purification and characterization of acetylcholinesterase from cotton aphid (aphis gossypii glover). | a simple and effective method was set up to purify acetylcholinesterase (ache, ec3.1.1.7) from the cotton aphid, aphis gossypii glover. the procedure involved filtration on a sephadex g-25 column, separation with sephadex g-200 and procainamide affinity column. ache from both susceptible and resistant strains were purified to a single band as resolved on denaturing polyacrylamide gel electrophoresis (sds-page). the specific activity increased by 35,100- and 33,680-fold with a yield of 30.3 and 2 ... | 2002 | 12210959 |
| purification and characterization of the trypsin inhibitor from sophora alopecuroide l. | sophora alopecuroide trypsin inhibitor (sati) was purified from the seeds of sophora alopecuroide l. by affinity chromatography on trypsin-sepharose 4b. the inhibitor is homogenous on sds-page (12%), which is a single polypeptide chain with alanine as its n-terminal. it has the molecular weight of 18 kd and pi at 9.3. results also show that the inhibitor has a 1:2 molar inhibitory ratio of inhibitor to trypsin. in further study with the method of modification, the residues of argenine and lysine ... | 1997 | 12215773 |
| aphid pests of strawberry crops and their parasitoids in france. | the pest status of aphids on strawberry crops has changed with time. they were mainly considered with respect to virus transmission. now, they are rather considered as sap-feeders and honeydew producers. as such, low populations regulated by natural enemies can be tolerated and systematic use of insecticides avoided. a survey of the species present in the different areas of production has been undertaken during 1999 and 2000 in france. during this survey, well known species of the strawberry cro ... | 2001 | 12425050 |
| two different genes encoding acetylcholinesterase existing in cotton aphid (aphis gossypii). | two acetylcholinesterase (ache) genes, ace1 and ace2, have been cloned from cotton aphid, aphis gossypii glover, using the rapid amplification of cdna ends (race) technique. to the best of our knowledge, this should be the first direct molecular evidence that multiple ache genes exist in insects. the ace1 gene was successfully amplified along its full length of 2371 bp. the open reading frame is 2031 bp long and encodes 676 amino acids (genbank accession no. af502082). the ace2 gene was amplifie ... | 2002 | 12502259 |
| [study on the physiological activities of the metabolites from paecilomyces arovirens]. | the metabolites of paecilomyces arovirens exhibited insecticidal activities to many inscct pcsts, including cotton aphid, aphis gossypii, hawthorn ispidcr mitc, tetranychus viennensis and larvae of imported cabbage worm, pietis rapae. a comparison was made between the metabolites of p. arovirens and naphthyl acetic acid (naa) in wheat (triticum aestivum) and water melon (cucumis sativus) bioassays on their physiological effects. results demonstrated that some of the metabolites physiological act ... | 1998 | 12549393 |
| selection by phage display of a variant mustard trypsin inhibitor toxic against aphids. | the mustard trypsin inhibitor, mti-2, is a potent inhibitor of trypsin with no activity towards chymotrypsin. mti-2 is toxic for lepidopteran insects, but has low activity against aphids. in an attempt to improve the activity of the inhibitor towards aphids, a library of inhibitor variants was constructed and cloned into the prlac3 phagemid vector. the library of 9.3 x 107 independent colonies was created by randomisation of a stretch of five consecutive codons in the reactive site. repeated sel ... | 2003 | 12581313 |
| resistance gene homologues in melon are linked to genetic loci conferring disease and pest resistance. | genomic and cdna fragments with homology to known disease resistance genes (rgh fragments) were cloned from cucumis melo using degenerate-primer pcr. fifteen homologues of the nbs-lrr gene family have been isolated. the nbs-lrr homologues show high divergence and, based on the partial nbs-fragment sequences, appear to include members of the two major subfamilies that have been described in dicot plants, one that possesses a tir-protein element and one that lacks such a domain. genomic organizati ... | 2002 | 12582612 |
| european monitoring of resistance to insecticides in myzus persicae and aphis gossypii (hemiptera: aphididae) with special reference to imidacloprid. | the susceptibility to several insecticides of 16 and 8 strains of myzus persicae sulzer and aphis gossypii glover, respectively, received from different european countries in 2001 was investigated. most of the strains were derived from places known for their aphid resistance problems to conventional insecticides before imidacloprid was introduced. in many regions and agronomic cropping systems imidacloprid has been an essential part of aphid control strategies for a decade, and therefore the sus ... | 2003 | 12593682 |
| effects of long-term storage at -14 degrees c on the survival of neozygites fresenii (entomophthorales: neozygitaceae) in cotton aphids (homoptera: aphididae). | neozygites fresenii-infected aphis gossypii cadavers, containing dormant hyphal bodies of n. fresenii, were stored in 4 ml glass vials at -14 degrees c in a standard consumer-type refrigerator/freezer for 1, 21, 30, 43, 51, and 68 months to determine the effect of storage on fungal survival. when the cadavers were removed from the freezer and placed in 25+/-1 degrees c, 100% relative humidity, and 12:12 (l:d) conditions, n. fresenii survival, as shown by fungal sporulation from the cadavers, was ... | 2003 | 12623309 |
| bionomics of scymnus (pullus) louisianae j. chapin (coleoptera: coccinellidae) as a predator of the soybean aphid, aphis glycines matsumura (homoptera: aphididae). | a field population of scymnus louisianae chapin (coccinellidae) was found attacking soybean aphids, apis glycines matsumura (aphidae), a pest recently introduced into kentucky. this coccinellid had not previously been found in kentucky. a greenhouse population of s. louisianae was established and its predation on a. glycines studied under laboratory conditions. total time to develop from egg to adult was about 20 d. about 70% of immatures survived to adulthood and they consumed approximately 100 ... | 2003 | 12650339 |
| potential of yellow sticky traps for lady beetle survey in cotton. | a 2-yr study was conducted to investigate the potential of using yellow sticky traps to survey lady beetles in cotton and to quantify seasonal activity patterns. the performance of sticky traps was compared with that of a 2-cycle vacuum sampler. the most common lady beetle species captured by sticky traps and vacuum sampler in cotton were hippodamia convergens guerin-meneville and scymnus loewii mulsant. sticky traps captured significantly more of both species of lady beetles, had greater captur ... | 2003 | 12650368 |
| efficacy of silwet l-77 against several arthropod pests of table grape. | silwet l-77, an organosilicone surfactant, was applied to several arthropod pests of california table grapes. eggs of grape mealybug, pseudococcus maritimus (ehrhorn), and omnivorous leafroller, platynota stultana walsingham, were tolerant to 0.1, 0.25, and 0.5% treatment solutions; however, eggs of pacific spider mite, tetranychus pacificus mcgregor, were highly susceptible with mortality >99.4% (0.1% silwet l-77). mortality of immature and adult stages of cotton aphid (aphis gossypii glover), ... | 2003 | 12650369 |
| host preference by allothrombium pulvinum (acari: trombidiidae) larvae on aphids: macrosiphum rosae, aphis gossypii and hyalopterus amygdali (homoptera: aphididae). | in this study aphid-plant association and its effect on host preference of parasitic allothrombium pulvinum larvae was examined with multiple-choice tests. host species selection, host size selection and superparasitism with mite larvae were studied with two-choice tests. three aphid species were used: macrosiphum rosae, aphis gossypii and hyalopterus amygdali. in multiple-choice tests, larvae of a. pulvinum showed no significant preference for any aphid-plant association when given m. rosae on ... | 2002 | 12797404 |
| [effect of plant alcohol extracts on vegetable aphids and their parasitoids]. | the repelling and controlling effect of alcohol extracts from 8 common plant species on 3 major vegetable aphids (myzus persicae, aphis gossypii and lipaphis erysimi) were studied in the laboratory, and the effect on their parasitoid was also studied. the results showed that the test 8 plant species had some effects on 3 aphids. the plant alcohol extracts from tephrosia vogelli and cinnamomum camphora had the most effect. the deterrent rate on myzus persicae, aphis gossypii and lipaphis erysimi ... | 2003 | 12827881 |
| high resistance of field populations of the cotton aphid aphis gossypii glover (homoptera: aphididae) to pyrethroid insecticides in pakistan. | samples of the cotton aphid, aphis gossypii glover, populations collected from the vicinity of multan in central pakistan from 1997 to 2000 were evaluated for pyrethroid resistance in comparison with a susceptible laboratory colony using a leaf-dip bioassay. resistance to seven pyrethroid insecticides viz. cypermethrin, alphacypermethrin, zetacypermethrin, cyfluthrin, fenpropathrin, bifenthrin, and lambdacyhalothrin was generally very high. however, a. gossypii consistently showed lower resistan ... | 2003 | 12852630 |
| [spatial and temporal niches of aphis gossypii and its predatory enemies]. | the research results showed that aphis gossypii had a narrow temporal niche breadth and a wide spatial niche breadth. this implied that the occurrence of a. gossypii population had the characteristics of obvious peak-period and whole-plant damage. the temporal-dynamic spatial niche breadthes of a. gossypii had no relativity to its own population densities. this implied that the damage of a. gossypii was complicated. among the predatory enemies, erigonidium graminicola and propylaea japonica had ... | 2003 | 12920899 |
| posterior midgut and hindgut are both sites of acquisition of cucurbit aphid-borne yellows virus in myzus persicae and aphis gossypii. | members of the family luteoviridae ('luteovirids') rely strictly on aphid vectors for plant-to-plant transmission. this interaction operates according to a persistent and circulative manner, which implies that the virions are being endocytosed and exocytosed across two epithelial barriers (alimentary tract and accessory salivary glands) in the vector's body. in several luteovirid-aphid vector species combinations, the route of virions in the insect has been investigated ultrastructurally by tran ... | 2003 | 14645929 |
| [effect of nitrogen fertilizer on pest population and cotton production]. | field experiments were conducted from 1999 to 2000 to assess the effect of nitrogen fertilization levels (0.225 and 450 kg.hm-2) on the population dynamics of cotton bollworm (helicoverpa armigera) and cotton aphid (aphid gossypii), and on the numbers of cotton buds and bolls in north china. the population densities of cotton bollworm and cotton aphid increased with increasing nitrogen fertilization during 1999 to 2000, but the differences between treatments were not significant (p > 0.05). ther ... | 2003 | 14986377 |
| characterization of acetylcholinesterases, and their genes, from the hemipteran species myzus persicae (sulzer), aphis gossypii (glover), bemisia tabaci (gennadius) and trialeurodes vaporariorum (westwood). | gene sequences encoding putative acetylcholinesterases have been reported for four hemipteran insect species. although acetylcholinesterase insensitivity occurs in insecticide-resistant populations of each of these species, no mutations were detected in the gene sequences from the resistant insects. this, coupled with a series of experiments using novel reversible inhibitors to compare the biochemical characteristics of acetylcholinesterase from a range of insect species, showed that the cloned ... | 2003 | 14986922 |
| activity of aphids associated with lettuce and broccoli in spain and their efficiency as vectors of lettuce mosaic virus. | this research sought to identify the aphid virus vector species associated with lettuce and broccoli crops in spain, and to determine their population dynamics and ability to transmit lettuce mosaic virus (lmv). green tile traps and moericke yellow water-pan traps were used to monitor aphid flights during the spring and autumn growing seasons of 2001. aphid species feeding on lettuce were counted weekly. the transmission efficiencies of lmv were determined for the aphid species caught most frequ ... | 2004 | 15036838 |
| estimation of the number of aphids carrying citrus tristeza virus that visit adult citrus trees. | aphid species were counted on citrus trees in orchards in valencia, spain, in the spring and autumn of 1997, 1998 and 1999. moericke yellow water traps, the 'sticky shoot' method and counts of established colonies were used in extensive surveys in which 29,502 aphids were recorded and identified. aphis spiraecola and aphis gossypii were the most abundant aphid species. the numbers of aphid species landing on mature trees of grapefruit, sweet orange, lemon and clementine and satsuma mandarins, we ... | 2004 | 15036840 |
| mutations in acetylcholinesterase associated with insecticide resistance in the cotton aphid, aphis gossypii glover. | two acetylcholinesterase genes, ace1 and ace2, have been fully cloned and sequenced from both organophosphate-resistant and susceptible clones of cotton aphid. comparison of both nucleic acid and deduced amino acid sequences revealed considerable nucleotide polymorphisms. further study found that two mutations occurred consistently in all resistant aphids. the mutation f139l in ace2 corresponding to f115s in drosophila acetylcholinesterase might reduce the enzyme sensitivity and result in insect ... | 2004 | 15041023 |
| cloning and characterization of a gut-specific cathepsin l from the aphid aphis gossypii. | we have characterized proteinase activities in gut extracts from the cotton-melon aphid (aphis gossypii glover), an insect feeding strictly on protein-poor phloem. the major, if not exclusive, intestinal proteinases of this aphid are of the cysteine type. a cdna has been cloned from a gut library and codes for the cysteine proteinase agcatl, a cathepsin l-like cysteine proteinase. the agcatl protein shows high sequence similarity with mammalian and some arthropod cathepsin l-like proteinases, bu ... | 2004 | 15056364 |
| [edge effect on the dynamics of pests and natural enemies in cotton agroecosystems]. | investigation on the population dynamics of pests and natural enemies on the cotton plants in the middle and edge of cotton agroecosystems showed that the population of the 2nd generation of cotton bollworms (heliocopavar armigia) and seedling aphids (aphis gossyppi) was respectively 1.94 times and 1.09 times higher, but that of the 3rd generation cotton bollworms and summer aphids population was respectively 62.12% and 97.73% lower in the edge than in the middle of cotton agroecosystem. the pop ... | 2004 | 15139195 |
| effect of the red imported fire ant on cotton aphid population density and predation of bollworm and beet armyworm eggs. | the effects of the red imported fire ant, solenopsis invicta buren (hymenoptera: formicidae), on cotton aphid, aphis gossypii glover, populations and its predation of bollworm, helicoverpa zea (boddie), and beet armyworm, spodoptera exigua (hübner), (both lepidoptera: noctuidae) eggs were evaluated in cotton under field conditions during 2001 and 2002 in central and northern texas. in central texas, cotton aphid populations were approximately 5.5 times greater and predation of sentinel bollworm ... | 2004 | 15154439 |
| [repellent effect of volatile oil from whitefly (syngonium podophyllum) on aphids and its chemical constituents]. | the interference effect of volatile oil from whitefly (syngonium podophyllum) on aptera aphid, guard aphid (aphis gossypii), mustard aphid (lipaphis erysimi) and red peach aphid (myzus persicae) was studied by using four arms olfraetometes. the results showed that the volatile oil had distinct repelling effect. the staying periods of test aphids in test areas were obviously shorter than in control areas, and the selecting frequencies were less than the control, too. the volatile oil did not show ... | 2004 | 15320409 |
| [geostatistic analysis on spatial patterns of aphis gossypii and erigonidium graminicola]. | the spatial structure and spatial correlativity of aphis gossypii and erigonidium graminicola populations during different periods were investigated by geostatistic methods. the results showed that the semivariogram of a. gossypii appeared as spherical type, indicating its spatial pattern was an aggregated type with a range of 7.33-12.40 cm, while that of e. graminicola was also fitted into spherical model, indicating an aggregated spatial arrangement with a range of 6.47-20.88 cm. the amount an ... | 2004 | 15362632 |
| predator-induced transgenerational phenotypic plasticity in the cotton aphid. | transgenerational phenotypic changes, whereby offspring have an altered trait or a distinct alternate phenotype, frequently occur in response to increased maternal predation risk. the cotton aphid, aphis gossypii (glover), is unique, however, as offspring consist of four distinct phenotypes ("normal" light green apterae, "normal" dark green apterae, "dwarf" yellow apterae, and alatae), all with divergent life history patterns and resulting population dynamics. here, we show that increased predat ... | 2005 | 15372226 |
| two amino acid substitutions in acetylcholinesterase associated with pirimicarb and organophosphorous insecticide resistance in the cotton aphid, aphis gossypii glover (homoptera: aphididae). | the complete coding sequences of two acetylcholinesterase (ache) genes, ace1 (orthologous to drosophila ace) and ace2 (paralogous to ace), from the cotton aphid (aphis gossypii) were identified and sequences from carbamate resistant and susceptible strains compared. no change in the amino acid sequences was found in ace1, while two amino acid substitutions, ser431phe and ala302ser, were detected between resistant and susceptible strains in ace2. the position of ser431phe corresponds to one of fo ... | 2004 | 15373811 |
| identification of mutations conferring insecticide-insensitive ache in the cotton-melon aphid, aphis gossypii glover. | we have identified two mutations in the ace1 gene of aphis gossypii that are associated with insensitivity of acetylcholinesterase (ache) to carbamate and organophosphate insecticides. the first of these, s431f (equivalent to f331 in torpedo californica), is associated with insensitivity to the carbamate insecticide pirimicarb in a range of a. gossypii clones. the s431f mutation is also found in the peach-potato aphid, myzus persicae (sulzer), and a rapid rflp diagnostic allows the identificatio ... | 2004 | 15373812 |
| influence of cover crops on insect pests and predators in conservation tillage cotton. | in fall 2000, an on-farm sustainable agricultural research project was established for cotton, gossypium hirsutum l., in tift county, georgia. the objective of our 2-yr research project was to determine the impact of several cover crops on pest and predator insects in cotton. the five cover crop treatments included 1) cereal rye, secale cereale l., a standard grass cover crop; 2) crimson clover, trifolium incarnatum l., a standard legume cover crop; 3) a legume mixture of balansa clover, trifoli ... | 2004 | 15384330 |
| effect of cotton cultivar on development and reproduction of aphis gossypii (homoptera: aphididae) and its predator propylaea japonica (coleoptera: coccinellidae). | the effects of three cotton cultivars with low ('zmz13'), medium ('hz401'), and high ('m9101') gossypol contents on the development, reproduction, and survival of aphis gossypii glover and its predator propylaea japonica (thunberg) were investigated. developmental duration and immature survivorship did not vary between aphids on the three cultivars, whereas a. gossypii feeding on m9101 (high gossypol cultivar) displayed significantly shorter adult longevity and lower fecundity than aphids fed on ... | 2004 | 15384338 |
| aphid transmission of a potyvirus depends on suitability of the helper component and the n terminus of the coat protein. | the present study investigates the specificity of potyviruses for aphid species. two potyviruses differing in their host range were used: zucchini yellow mosaic virus (zymv) mainly infecting cucurbits and turnip mosaic virus (tumv) mainly infecting crucifers. two sets of aphids species were used as vectors, one polyphagous (myzus persicae and aphis gossypii) and the other from crucifers (brevicoryne brassicae and lipaphis erysimi). evidence is provided that the specificity between a vector and a ... | 2005 | 15503223 |
| biochemical evidence that an s431f mutation in acetylcholinesterase-1 of aphis gossypii mediates resistance to pirimicarb and omethoate. | molecular changes in acetylcholinesterase (ache) leading to target-site resistance to carbamate and organophosphate insecticides have recently been identified. of particular interest is the s431f mutation in ace2 and its orthologue ace1 of myzus persicae sulzer and aphis gossypii glover, respectively. this mutation has been correlated with resistance to pirimicarb, but biochemical evidence has not yet been provided. here, we describe for the first time that recombinantly expressed ache1 from a g ... | 2004 | 15532677 |
| [effect of nitrogen fertilization and square loss on cotton aphid population, cotton leafhopper population and cotton yield]. | the study on the effects of nitrogen fertilization (0-450 kg x hm(-2)) and square loss (0-12 x plant(-1)) on cotton aphid population, cotton leafhopper population and cotton yield showed that there were no significant differences in cotton aphid population, cotton leafhopper population, and numbers of effective bolls between transgenic bt cotton and non-transgenic cotton. cotton aphid populations on the two cottons were significantly influenced by nitrogen fertilization and by the interaction of ... | 2004 | 15574003 |
| a cost of alarm pheromone production in cotton aphids, aphis gossypii. | the sesquiterpene, (e)-beta-farnesene, is used by many aphid species as an alarm pheromone to warn related individuals of predation. disturbed cotton aphids, aphis gossypii glover, released (e)-beta-farnesene into the air as detected by solid phase microextraction and gas chromatography mass spectrometry (gc-ms). solvent extracts of cotton aphids of various life stages and weights also were analyzed by gc-ms for sums of ions 69 and 93, which discriminated (e)-beta-farnesene from coeluting compou ... | 2005 | 15586262 |
| virion stability and aphid vector transmissibility of cucumber mosaic virus mutants. | the physical stability of virions of cucumber mosaic virus (cmv) mutants was investigated to determine if relative stability correlated with efficiency of aphid transmission. virion stability was evaluated by a urea disruption assay and by testing the infectivity of virus following purifications. all viruses were infectious when purified using a low salt buffer without organic solvent, whereas two of seven viruses were less stable and inactivated following purification with a high salt buffer an ... | 2005 | 15661170 |
| [relationships between aphis gossypii and its natural enemies in megranate field]. | in this paper, the relevancy of aphis gossypii with its natural enemies was studied by using grey systematic analysis. the results showed that the major natural enemies of aphis gossypii were tetragnathidae (0.8607), therdion octomaculatum (0.8058), therdion octomaculatum (0.7989), haramonia aiyridis (0.7881) and chrysopa sepetempunctata (0.7758). as for the daily total predation, the natural enemies which highly associated with the ideal dominant natural enemies were erigonidium graminicola (0. ... | 2004 | 15825450 |
| impact of melon accessions resistant to aphids on the demographic potential of silverleaf whitefly. | bemisia tabaci (gennadius) and aphis gossypii glover are devastating melon, cucumis melo l., pests. the geographic areas where they occur overlap, and the same chemicals are used to control both of them. therefore, to reduce pesticide use, it would be necessary to breed melon lines that simultaneously express a resistance to both insects. female survival; the time when reproduction starts, peaks, and ends; the number of female offspring at the reproductive peak; and total reproduction (s) were d ... | 2005 | 15889749 |
| mass harvesting of the entomopathogenic fungus, neozygites fresenii, from natural field epizootics in the cotton aphid, aphis gossypii. | epizootics caused by insect pathogens sometimes occur over wide areas and result in millions of infected insects. naturally infected insects can be considered a natural resource for harvesting insect pathogens. we developed methods to mass harvest the fungal pathogen neozygites fresenii (entomophthorales: neozygitaceae) from epizootics in aphis gossypii (homoptera: aphididae) in a commercial cotton field in arkansas. a total of 30,722 aphids infected with n. fresenii in the mature hyphal body or ... | 2005 | 15955339 |
| impact of the entomopathogenic fungus verticillium lecanii on development of an aphid parasitoid, aphidius colemani. | the parasitoid aphidius colemani developed normally (approximately 90% adult emergence) when its cotton aphid (aphis gossypii) host was treated with verticillum lecanii conidia 5 or 7 days after parasitization. fungus exposure 1 day before or up to 3 days after parasitization, however, reduced a. colemani emergence from 0 to 10%. also, numbers of spores and mycelial fragments in aphid homogenates were much higher in aphids exposed to the fungus up to 3 days after parasitization than in aphids tr ... | 2005 | 15955345 |
| antibiosis and antixenosis to aphis gossypii (homoptera: aphididac) in colocasia esculenta. | fifty cultivars of taro, colocasia esculenta (l.) schott (araceae), collected from islands in micronesia and polynesia, eight cultivars from the university of hawaii's taro germplasm collection, and a closely related aroid, xanthosorna sagittifolium (l.) (araceae), were screened for antibiosis and antixenosis to aphis gossypii clover. life history data for a. gossypii were collected by assessing survivorship and fecundity of aphids caged on taro leaves in the field. significant differences in ap ... | 2005 | 16022332 |
| polymorphisms in a carboxylesterase gene between organophosphate-resistant and -susceptible aphis gossypii (homoptera: aphididae). | resistance to omethoate was suppressible by the hydrolytic enzyme inhibitor sss-tributyl phosphorotrithioate in a laboratory-selected resistant cotton aphid, aphis gossypii glover, strain, suggesting the involvement of hydrolytic enzymes in the detoxification process. the kinetic properties of carboxylesterases from both resistant and susceptible cotton aphids were characterized by four acyl ester substrates: alpha-naphthyl acetate (alpha-na), alpha-naphthyl butyrate (alpha-nb), alpha-naphthyl p ... | 2005 | 16156587 |
| morphological discrimination of aphis gossypii (hemiptera: aphididae) populations feeding on compositae. | aphis gossypii glover is a polyphagous aphid pest with a worldwide distribution. however, there is evidence that on a global scale the name a. gossypii is being applied to a number of forms with different life cycles and/or host-plant associations. morphometric variation of a. gossypii samples from crops and non-cultivated plants in many parts of the world was examined, to determine whether this variation is correlated with the hosts from which the aphids originated. samples of a. gossypii were ... | 2006 | 16556336 |
| biological control of aphis gossypii on pepper plant using coccinella algerica. | to calibrate biological control in pepper plant against aphis gossypii using coccinella algerica different experimentation were made. the consumption of c. algerica during the larval stage was enumerated in laboratory conditions. the densities (1, 4, 8 larvae/plant) to l2 stage of c. algerica necessarily to decrease aphid's populations were determined in plant pepper and the daily consumption in the pepper plant at the different densities was calculated. the density with 8 larvae at semi natural ... | 2005 | 16628911 |
| sublethal effects of imidacloprid and pymetrozine on the life table parameters of aphis gossypii glover (homoptera: aphididae). | in this study we report the sublethal effects of recommended concentrations of imidacloprid and pymetrozine on cotton aphid's reproduction. fecundity life table parameters for ag were studied on cucumber under conditions of 25+/-1 degrees c, 70+/-5% rh and photoperiod of 16:8 (l:d). leaf discs of cucumber immersed in the recommended concentrations of the above mentioned insecticides and controls and the new born female was released on the lower surface of leaf discs. values of parameters such as ... | 2005 | 16628917 |
| are fluctuating asymmetry studies adequately sampled? implications of a new model for size distribution. | previous work on fluctuating asymmetry (fa) has highlighted its controversial relationship with environmental stress and genetic architecture. while size-based measures of fa have been assumed to have half-normal distributions within populations, studies of model developmental mechanisms have suggested other plausible distributions for fa. we investigated the distribution of fa in large empirical data sets of wing shape and wing size asymmetry from three species of insects (cotton aphid aphis go ... | 2006 | 16670983 |
| [behaviors of propylaea japonica (coleoptera: coccinellidae) in searching and preying cotton aphid aphis gossypii (coleoptera: coccinellidae) in the cotton plant]. | the study showed that the searching activity of p. japonica on cotton aphid aphis gossypii decreased gradually with decreasing aphid density. when enough a. gossypii existed, p. japonica had a preferential searching and preying activity on the top of cotton plant. there was no significant difference in the preying activity of p. japonica at different positions of cotton plant, while the searching activity of the ladybird beetle was significantly lower on cotton m9101 than on cotton zhongmian 13. ... | 2006 | 16706050 |
| verticillium lecanii spore formulation using uv protectant and wetting agent and the biocontrol of cotton aphids. | verticillium lecanii spores (10(8 )spores ml(-1)) suspended in 1% (w/v) montmorillonite scpx-1374 and 1% (w/v) of the wetting agent, em-apw#2, which is a polyoxyethylene, had approx. 80% survival after exposure to uv-c for 30 min and about 93% after exposure to uv-b for 6 h. in greenhouse testing, cotton aphid densities increased 14-fold over their initial density in 15 d without spore application. however, initial cotton aphid densities were decreased by 60% of the initial level when plants wer ... | 2006 | 16786263 |
| analysis of genetic bottlenecks during horizontal transmission of cucumber mosaic virus. | genetic bottlenecks may occur in virus populations when only a few individuals are transferred horizontally from one host to another, or when a viral population moves systemically from the infection site. genetic bottlenecks during the systemic movement of an rna plant virus population were reported previously (h. li and m. j. roossinck, j. virol. 78:10582-10587, 2004). in this study we mechanically inoculated an artificial population consisting of 12 restriction enzyme marker mutants of cucumbe ... | 2006 | 16912285 |
| development of a population-based threshold model of conidial germination for analysing the effects of physiological manipulation on the stress tolerance and infectivity of insect pathogenic fungi. | entomopathogenic fungi are being used as biocontrol agents of insect pests, but their efficacy can be poor in environments where water availability is reduced. in this study, the potential to improve biocontrol by physiologically manipulating fungal inoculum was investigated. cultures of beauveria bassiana, lecanicillium muscarium, lecanicillium longisporum, metarhizium anisopliae and paecilomyces fumosoroseus were manipulated by growing them under conditions of water stress, which produced coni ... | 2006 | 16913922 |
| efficacy assessment of aphidius colemani (hymenoptera: braconidae) for suppression of aphis gossypii (homoptera: aphididae) in greenhouse-grown chrysanthemum. | to assess biological control as a management tool for the cotton aphid, aphis gossypii glover (homoptera: aphididae), the efficacy of aphidius colemani viereck (hymenoptera: braconidae) for suppression of a. gossypii in greenhouse-grown chrysanthemums, dendranthema grandiflora (tzvelev), was compared with a pesticide standard, imidacloprid (marathon 1% g) and an untreated check. no significant differences were found between aphid populations in the two treatments. a. colemani and imidacloprid ke ... | 2006 | 16937661 |
| intervention thresholds for aphis spiraecola (hemiptera: aphididae) on citrus clementina. | the production of clementine fruit was affected by varying densities of aphis spiraecola patch (hemiptera: aphididae) maintained on four groups of clementine, citrus clementina hort. ex tan., trees individually isolated in mesh cages. a formula relating the number of aphids per square meter of canopy per group of trees to yield loss in that group of trees was obtained, permitting us to calculate the economic injury levels (eils) and economic thresholds (ets) for treatment against a. spiraecola, ... | 2006 | 16937682 |
| dispersal strategies of phytophagous insects at a local scale: adaptive potential of aphids in an agricultural environment. | the spread of agriculture greatly modified the selective pressures exerted by plants on phytophagous insects, by providing these insects with a high-level resource, structured in time and space. the life history, behavioural and physiological traits of some insect species may have evolved in response to these changes, allowing them to crowd on crops and to become agricultural pests. dispersal, which is one of these traits, is a key concept in evolutionary biology but has been over-simplified in ... | 2006 | 17014710 |
| effect of synthetic aphid alarm pheromone (e) -beta-farnesene on development and reproduction of aphis gossypii (homoptera: aphididae). | the synthetic aphid alarm pheromone (e)-beta-farnesene (ebf) is released by aphids in response to predation or other disturbances that occur in the colony. this is presumed to benefit the population by allowing increased survival of related individuals taking successful evasive action after perception of the pheromone. the effect of pheromone perception by aphids in the absence of real threats was investigated to determine the baseline effect of this communication on aphid survival, development, ... | 2006 | 17066793 |
| effect of cotton cultivar on performance of aphis gossypii (homoptera: aphididae) in iran. | cotton aphids, aphis gossypii glover (homoptera: aphididae), obtained from cotton, gossypium hirsutum l., fields in the gorgan region of northern iran, were colonized on 'varamin' cotton plants in a growth chamber. the development, survivorship, and life table parameters of the cotton aphid were evaluated at 27.5 +/- 1 degrees c, 65 +/- 10% rh, and aphotoperiod of 14:10 (l:d) h of artificial light on five commonly growing cotton cultivars: varamin, 'sealand' (relatively resistant cultivar), 'bak ... | 2006 | 17066818 |
| [pathogenicity of hyphomycet fungi to aphids aphis gossypii glover and myzus persicae (sulzer) (hemiptera: aphididae)]. | the aphids aphis gossypii and myzus persicae are cosmopolitan, poliphagous and damage cultivated plants. the effects of the entomopathogenic fungi beauveria bassiana (isolate ibcb 66), metarhizium anisopliae (isolate ibcb 121), paecilomyces fumosoroseus (isolate ibcb 141) and lecanicillium (= verticillium) lecanii (isolate jab 02) on third instar nymphs of a. gossypii and m. persicae were evaluated in the laboratory at 25 degrees c, 70 +/- 10% rh and 12h photophase. the aphids were transferred t ... | 2006 | 17144139 |
| novel acetylcholinesterase target site for malaria mosquito control. | current anticholinesterase pesticides were developed during world war ii and are toxic to mammals because they target a catalytic serine residue of acetylcholinesterases (aches) in insects and in mammals. a sequence analysis of aches from 73 species and a three-dimensional model of a malaria-carrying mosquito (anopheles gambiae) ache (agache) reported here show that c286 and r339 of agache are conserved at the opening of the active site of aches in 17 invertebrate and four insect species, respec ... | 2006 | 17183688 |
| temporal synergism by microencapsulation of piperonyl butoxide and alpha-cypermethrin overcomes insecticide resistance in crop pests. | a microencapsulated formulation that gives a burst release of piperonyl butoxide (pbo) several hours before a burst release of a conventional pyrethroid can effectively overcome metabolic resistance in bemisia tabaci gennadius, helicoverpa armigera (hübner), aphis gossypii glover and myzus persicae sulzer. this increase in efficacy against resistant pests was reflected in a field trial against b. tabaci on cotton, eliminating the need for two treatments. the ratio between the active insecticide ... | 2007 | 17304634 |
| induction of apoptosis by iridovirus virion protein extract. | chilo iridescent virus (civ; iiv-6) is the type member of the genus iridovirus (family iridoviridae, large icosahedral cytoplasmic dna viruses). civ induces death and deformity in the cotton boll weevil, anthonomus grandis, replicates productively in larvae of the cotton boll weevil, and significantly reduces laboratory populations of the cotton aphid, aphis gossypii. civ virion protein extract (cvpe) shuts down host protein synthesis in several insect cell lines and induces mortality in neonate ... | 2007 | 17347770 |
| [fitness cost associated with carbosulfan resistance in aphis gossypii glover (hemiptera: aphididae)]. | in order to collect basic information for a resistance management program of aphis gossypii glover to carbosulfan, studies to evaluate fitness costs associated to this resistance were conducted under laboratory conditions. for this purpose, we studied the stability of carbosulfan resistance in a. gossypii populations with differing initial frequencies of resistance and compared life-history traits of carbosulfan-susceptible and resistant strains. the stability of resistance was followed in three ... | 2016 | 17348137 |
| [effect of the time of inoculation of the cotton vein mosaic virus by aphis gossypii glover (hemiptera: aphididae) on growth and yield of cotton plants]. | aphis gossypii glover is the vector of the cotton vein mosaic virus (cvmv), which causes serious damages to cotton. this work was carried out in a greenhouse at unesp - universidade estadual paulista, in jaboticabal, são paulo state, brazil, to evaluate the effect of inoculation date of the cvmv on growth and yield of cotton plants. cotton plants of cultivar cnpa ita 90 at 20, 27, 34, 41, 48 and 55 days after the emergency (dae) received one wingless viruliferous adult of a. gossypii, which rema ... | 2007 | 17348138 |
| [transmission of passion fruit woodiness virus by aphis gossypii (glover) (hemiptera: aphididae) and colonization of passion flower by the vector]. | the transmission of passion fruit woodiness virus (pwv) by aphis gossypii (glover) was evaluated. in two independent experiments, a. gossypii transmitted pwv to passion fruit plants at the rates of 75% and 100%, when eight and twelve viruliferous aphids were deposited by plant, respectively. at the end of the tests, nymphs of a. gossypii were observed in some of the passion fruit plants, suggesting that the aphid species was colonizing the plants. this seems to be the first report of passiflora ... | 2007 | 17352080 |
| pathogenicity of fusarium semitectum against crop pests and its biosafety to non-target organisms. | microbial control is receiving more attention, since these alternative tactics, compared to chemical control methods, are energy saving, non polluting, ecologically sound and sustainable. a mycopathogen, fusarium semitectum berk. and rav. (arsef 7233) was isolated from diseased cadavers of aphid (aphis gossypii) and cultured in saboraud maltose agar supplemented with yeast extract medium (smay). being isolated first time from the chilli ecosystem its potential was evaluated. experiments were con ... | 2006 | 17385514 |
| effect of temperature on life history of aphidius colemani and aphidius matricariae (hymenoptera: braconidae), two parasitoids of aphis gossypii and myzus persicae (homoptera: aphididae). | the performance of two aphid parasitoids, aphidius colemani viereck and aphidius matricariae (haliday), against aphis gossypii glover on greenhouse cucumber (cucumis sativus l.) and myzus persicae (sulzer) on sweet pepper (capsicum annuum l.) were evaluated at various constant temperatures. biological parameters of both parasitoids including developmental time, pupal survivorship, percentage of parasitism, and sex ratio of the progeny were studied at 5, 10, 15, 20, 25, 30, and 35 degrees c. at 2 ... | 2007 | 17445360 |
| the efficacy of a petroleum spray oil against aphis gossypii glover on cotton. part 1: mortality rates and sources of variation. | petroleum spray oils (psos) kill insect pests on contact, and the composition of modern psos is substantially different from the ones introduced earlier. the effects of direct application of a new nc24 pso on the cotton aphid, aphis gossypii glover, were therefore determined. this covered not only aphid mortality rates but also the way in which the oils affected aphid behaviour at the time of contact with the oil. direct application of the nc24 oil proved to be highly effective in controlling a. ... | 2007 | 17469079 |
| the efficacy of a petroleum spray oil against aphis gossypii glover on cotton. part 2: indirect effects of oil deposits. | the primary mode of action of petroleum spray oils (psos) on pest insects is through direct contact. indirect effects are, however, also possible, and deposits of the oils may influence pest populations by killing insects and/or by influencing their behaviour. the indirect effects of deposits of a new nc24 oil against the cotton aphid, aphis gossypii glover, were therefore determined. the effects of oil deposits on the acceptance of cotton as host plant by the aphids were assessed, as well as ap ... | 2007 | 17469081 |
| lead optimization and insecticidal activity of analogues of daphneolone isolated from stellera chamaejasme l. | starting from the chemical structure of the botanical aphicides 1,5-diphenyl-1-pentanone and 1,5-diphenyl-2-penten-1-one, extracted from stellera chamaejasme l., the authors designed and synthesized a series of novel compounds following the concept of bioisosterism. their structures were established on the basis of (1)h nmr and gc-ms spectra, and the insecticidal activities of the compounds were evaluated against aphis gossypii glover. the results demonstrated that the substitution of a heterocy ... | 2007 | 17575567 |
| an implicit approach to model plant infestation by insect pests. | various spatial approaches were developed to study the effect of spatial heterogeneities on population dynamics. we present in this paper a flux-based model to describe an aphid-parasitoid system in a closed and spatially structured environment, i.e. a greenhouse. derived from previous work and adapted to host-parasitoid interactions, our model represents the level of plant infestation as a continuous variable corresponding to the number of plants bearing a given density of pests at a given time ... | 2007 | 17582442 |
| [development of aphidius colemani viereck (hym.: braconidae, aphidiinae) and alterations caused by the parasitism in the host aphis gossypii glover (hem.: aphididae) in different temperatures]. | aphidius colemani viereck is among the main natural enemies used for biological control of aphis gossypii glover. the objective of the present study was to evaluate the development of a. colemani and the alterations caused by the parasitism in the host a. gossypii in different temperatures and to estimate the thermal requirements of the parasitoid. the experiments were carried out in controlled environmental chambers at 16, 19, 22, 25, 28 and 31 +/- 1 degrees c, 70 +/- 10% rh, and 12h photophase ... | 2007 | 17710327 |