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).