ArticleNeotropical entomology2026
Baseline Susceptibility and Diagnostic Concentration of AcMNPV in Rachiplusia nu (Lepidoptera: Noctuidae) in Brazil and Cross-resistance to Cry1Ac.
Article in Neotropical entomology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The sunflower looper, Rachiplusia nu (Guenée, 1852) (Lepidoptera: Noctuidae), has evolved practical resistance to the Cry1Ac toxin from Bacillus thuringiensis Berliner (Bt) expressed in soybean in Brazil and neighboring countries. In view of this, the use of chemical or biological insecticides is required for their control. In 2023, a bioinsecticide based on Autographa californica multiple nucleopolyhedrovirus (AcMNPV: Baculoviridae: Alphabaculovirus) was registered for the control of R. nu in Brazil. To support the use of this new insecticide, we conducted diet-overlay bioassays to characterize the baseline susceptibility of Brazilian populations of R. nu to AcMNPV and establish a diagnostic concentration for resistance monitoring. Additionally, we evaluated cross-resistance between AcMNPV and Cry1Ac by testing AcMNPV in both Cry1Ac-susceptible and -resistant populations of R. nu. The tested field populations of R. nu were susceptible to AcMNPV. The LC
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