Target-site resistance to pyrethroids in heliothis virescens (F.) and Helicoverpa zea (Boddie)

Document Type

Article

Publication Date

9-15-1998

Abstract

A neurophysiological assay was used to record and compare target-site sensitivities to the pyrethroid insecticide, allethrin, in larvae and adults of the tobacco budworm, Heliothis virescens (F.) and larvae of the bollworm, Helicoverpa zea (Boddie). High frequencies of target-site resistance were measured in larval H. virescens and expression was greater in early- than late-season collections. Adult H. virescens also expressed reduced sensitivity to allethrin, but frequency distributions were not statistically different from that of a laboratory-reared susceptible strain. Target-site sensitivity was similar between larvae from laboratory-susceptible and field-collected strains of H. zea during 1995, but low frequencies of target-site resistance were detected in larvae collected from conventional and transgenic cotton during 1996. The significance of these findings with respect to the utility of the adult vial test as a monitoring tool and the continued control of H. zea with pyrethroids is discussed.

Publication Source (Journal or Book title)

Pesticide Biochemistry and Physiology

First Page

155

Last Page

167

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