Toxicity of pyrethroids and other insecticides against susceptible and resistant tobacco budworm larvae and synergism by chlordimeform.

1987

Synergism of pyrethroids by chlordimeform against susceptible and resistant Heliothis.

Chlormideform sunergizes synthetic pyrethoids against both Heliothis zea and H. virescens. Synergism is grater against the latter species. The precise mechanism of the synergism is not known but probaly involves target site effects rather than inhibition of metabolism. In preliminary test with pyrethroid resistant insects from western Texas evidence was obtained that chlordimeform was more synergistic with a strain than with laboratory insects.

Tobacco budworm resistance to pyrethroids: resistance spectra, synergists, and substitute insecticides.

1988