The black cutworm, Agrotis ipsilon (Hüfnagel) (Lepidoptera: Noctuidae), is a globally significant underground pest known for its broad host range and destructive feeding habits. While nucleopolyhedrovirus (NPVs) and Bacillus thuringiensis (Bt) Berliner (Bacillales: Bacillaceae) have been widely used as microbial insecticides, their combined effects against A. ipsilon remain poorly understood. This study evaluated the pathogenicity of different NPVs and Bt strains against A. ipsilon larvae, both individually and in combination. Pathogenicity va...
