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Updated: Jan 25, 2026

Bioassays for Monitoring Insecticide Resistance
Published on: December 30, 2010
No cross-resistance between ChinNPV and chemical insecticides in Chrysodeixis includens (Lepidoptera: Noctuidae)
Daniela N Godoy1, Fábio M Führ1, Regis F Stacke1
1Department of Plant Protection, Federal University of Santa Maria (UFSM), Roraima avenue 1000, Santa Maria, Rio Grande do Sul 97105-900, Brazil.
Abstract:
Chrysodeixis includens nucleopolyhedrovirus (ChinNPV: Baculoviridae: Alphabaculovirus) is an active ingredient of a biological-based insecticide (Chrysogen®) recommended against soybean looper (SBL), Chrysodeixis includens (Walker, [1858]), in soybean in Brazil. We investigated if SBL strains resistant to chemical insecticides are cross-resistant to the baculovirus ChinNPV. In droplet feeding bioassays, SBL strains resistant to lambda-cyhalothrin and teflubenzuron showed equivalent susceptibility to ChinNPV as heterozygous and susceptible strains, indicating no cross-resistance between ChinNPV and chemical insecticides in SBL. Therefore, the ChinNPV is a valuable new "mode-of-action" tool for SBL resistance management in Brazil.
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