Direct Effects of Pesticides on Bt
To investigate direct interactions between pesticides and Bt, we usedin vitro growth curves and viable spore counts of oral diet disks. In vitro Btt growth rate significantly increased upon OP exposure, but there was no effect of Pyr exposure on in vitro growth rate (Suppl. Fig. 2; Suppl. Table 4). The germination rates of Btt spores on the diet disks exhibited no significant differences among control, OP, or Pyr pesticide diet treatments (Suppl. Fig. 3; Suppl. Table 5).