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... Management of the bollworm (Helicoverpa zea) and tobacco budworm (Heliothis virescens) complex in cotton (Gossypium hirsutum) is a significant production cost and a large contributor of insecticides to the environment. Genetic resistance or tolerance could help alleviate these problems. A trial was conducted in 1993-94 in South Carolina to identify and exploit sources of bollworm/tobacco budworm r ...
... Cover crops and conservation tillage are becoming increasingly important in cotton production in the southeastern United States. It is important to know the effects of changing cropping practices on pest populations. Thrips were collected from cotton seedlings rotated with corn or after a rye winter cover crop, either tilled or untilled, and either with or without aldicarb application. Insecticide ...
... Pathogens express virulence genes in response to the combination of environmental conditions present in the host environment. The crop is the first gastrointestinal environment encountered in birds. However, feed withdrawal alters the crop environment resulting in an increased pH, and decreased concentrations of lactate, glucose and amino acids compared with unmoulted birds. Salmonella enteritidis ...
... Four foliar insecticide treatments [AI]/ha), cypermethrin (0.067 kg), Bacillus thuringiensis subsp. kurstaki (Berliner) (29.6 billion International Units [BIU]), amitraz (0.14 kg), and B. thuringiensis + amitraz (29.6 BIU + 0.14 kg), were evaluated for influence on economic returns and for efficacy against the tobacco budworm-bollworm complex, Heliothis virescens (F.) and Helicoverpa zea (Boddie), ...
... Chlordimeform and aldicarb were evaluated in small plots in field studies for effects on yield of seven cotton, Gossypium hirsutum L., cultivars in 1985 and 1986 and nine cultivars in 1987. Aldicarb (1.68 kg [AI]/ha) was incorporated above the seed at planting time, and six chlordimeform (0.14 kg [AI]/ha) applications were made on a 5-8-d schedule beginning at the second-to-fourth-true-leaf stage. ...
... The relative densities, distribution patterns, and economic impact of Helicoverpa zea and Heliothis virescens were compared on transgenic cotton (BT01DP) expressing δ-endotoxin from Bacillus thuringiensis subsp. kurstaki, a 90:10 Bt:non-Bt seed mix, and non-transgenic cotton (Coker 213), in South Carolina during 1995. Helicoverpa zea was the predominant species, comprising approximately 95% of the ...
... We examined the ability of stationary phase Salmonella typhimurium to adhere and invade cultured HEp-2 cells after growth in broth supplemented with acetate, propionate, butyrate, or a mixture of the three short chain fatty acids (SCFA). At pH 6, all concentrations, except 25 and 50 mM butyrate, reduced cell-association of S. typhimurium when compared to controls, while at pH 7 only 100 mM concent ...
... Veillonella CF3 which was isolated from chicken cecum as part of an anti-Salmonella competitive exclusion culture and produces significant amounts of propionic acid was used to examine growth and survival response to short-chain volatile fatty acids. Growth rate of Veillonella CF3 was significantly (p < 0. 05) decreased by exposure to propionate and butyrate (20-150 mM), while increased by additio ...
... The effect of early-season flower bud damage on yield, quality, and maturity of cotton, Gossypium hirsutum L., was determined at Florence and Blackville, SC, from 1989 to 1994. From 1989 to 1991, yields from insecticide-treated plots for Heliothis virescens (F.) during June were compared with plots left untreated during June. In all cases from 1989 to 1991, no significant differences in yield were ...