INSECTICIDE SELECTIVITY TO SUPPUTIUS CINCTICEPS (STAL) (HET., PENTATOMIDAE) AND ITS PREY SPODOPTERA-FRUGIPERDA (SMITH,J.E.) (LEP., NOCTUIDAE)

The selectivity of malathion, carbaryl, permethrin, and deltamethrin t o Supputius cincticeps (Stal) (Het., Pentatomidae) and its prey Spodop tera frugiperda (J. E. Smith) (Lep., Noctuidae) (fall armyworm) was ev aluated using leaves dipped in insecticide dilutions. Based on LC,, va lues, malathion was the least toxic insecticide to the fall armyworm f ollowed by carbaryl, permethrin and deltamethrin which was the most to xic compound to this insect pest. Malathion was also the least toxic i nsecticide to the predaceous bug S. cincticeps, while carbaryl and per methrin showed intermediate toxicity and deltamethrin was the most tox ic insecticide to this species. Malathion and carbaryl were more toxic to the predator than to the fall armyworm showing low selectivity in favour of the first. However, the pyrethroids showed the opposite effe ct with deltamethrin being the most selective insecticide in favour of S. cincticeps. Nymphs of the fifth instar and adults of the predator were more tolerant to the pyrethroids than third-instar nymphs. The ot her insecticides showed similar toxicity to all three developmental st ages of the predator.