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A Review of the Inheritance of Insecticide Resistance by the Tobacco Budworm (Noctuidae: Lepidoptera)

Dan A. Wolfenbarger and A.C. Bartlett

ABSTRACT

Review of literature found 19 patterns of inheritance of insecticide resistance by tobacco budworm strains and their recipro-cal crosses. Patterns of inheritance were shown for three organophosphorus, one carbamate, two pyrethroid insecticides and a toxin of transgenic Bacillus thuringiensis (Bt). Tests were conducted from 1978 to 2001 and patterns were determined in the first generation. Resistant (R] and susceptible (S) strains and crosses were treated with topical applications of the chemi-cal insecticides to determine LD50s. Bt toxin was added to diet prior to placing neonate larvae on the diet to determine LC50s. Overlapping or non-overlapping 95% confidence limits of the LD50s or LC50s were used to indicate dominance or incomplete dominance, sex-linkage and recessive inheritance patterns. Eighty-nine percent of the patterns showed significant differences between R and S strains. Incomplete dominance occurred in 58% of the patterns. Dominance, recessivity and sex linkage were determined in 21% of the patterns. In tests with monocrotophos one strain showed a pattern of dominant sex-linkage while a second strain showed a pattern of incompletely dominant sex-linkage. In three tests using methyl para-thion, two strains showed incomplete dominant autosomal inheritance while one strain showed sex-linked dominant inheri-tance. Slope values >3.44 are suggested to indicate homozygosity of response (resistance or susceptibility) by strain or crosses of strains.





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Document last modified April 16, 2003