Effect of Some Chemical Insecticides on Bacillus thuringiensis Spore and Parasporal Crystals

The effects of seven chemical insecticides on CH strain were reported. The results of the laboratory study showed that 2.5% deltamethrin EC, 48% chlorpyrifos EC had no harmful effects and they can be made as composite preparation with Bt, 4.5% beta-cypermethrin EC, 2.5% lambda-cyhalothrin EC, 20% methomyl EC and 40% phoxim EC had weak harmful effects on Bt spore and they can be tank mixed with Bt for use. 80% dichlorvos was very harmful to parasporal crystals. SDS-PAGE analysis and bioassay also showed the same results.