ABSTRACT
This study aimed to evaluate the influence of different insecticides and fungicides to Trichogramma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae) in different hosts. The tests were performed on adults of T. pretiosum in host Anagasta kuehniella (Zeller, 1879) (Lepidoptera: Pyralidae) and Helicoverpa zea (Boddie, 1850) (Lepidoptera: Noctuidae). The results showed that the pesticides studied had different effects on T. pretiosum depending on the host. The insecticides IMIDACLORIPRIDO + BETA-CYFLUTHRIN and METHOMYL were the most aggressive reducing parasitism of adult T. pretiossum in both hosts, whereas for fungicides, DIMETOMORPH + MANCOZEB and MANCOZEB were the most influential. From the results it is concluded that the host can influence the selectivity tests of insecticides and fungicides on parasitoids of the genus Trichogramma, considering, T. pretiosum was more susceptible to the insecticide METHOMYL and ACIBENZOLAR-S-METHYL when created in A. kuehniella and the fungicide MANCOZEB + DIMETOMORPH created when H. zea. There were no significant reductions in emergency percentage of descendants when fungicides were applied.
Key words:
Parasitoid; Pesticides; Plant management; Alternative hosts
