TLR4 and infection: The relative expression levels of Toll-like receptors (Sfrutollo, Sfrutoll3, Sfrutoll6, Sfrutoll7, and Sfrutoll18w) and Sfruspatzle, Sfrumyd88, Sfrutube, and Sfrupell all showed a significant upregulation at 36 or 48 h after infection, indicating that the Toll signaling pathway of S. frugiperda was activated after B. bassiana infection and the relative high expression of their corresponding proteins.