Bioatividade de produtos fitossanitários utilizados na cultura do tomateiro (Lycopersicon esculentum Mill.) a Trichogramma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae) nas gerações F1 e F2

Abstract

The bioactivity of eighteen pesticides commonly used to pests and diseases control on tomato, in two strains of Trichogramma pretiosum Riley, 1879 (L9=Alegre, ES and L10= Venda Nova do Imigrante, ES, Brazil) in F1 and F2 generations, was evaluated under laboratory conditions. The bioassays were conducted in a climatic chamber at 25 ± 2 ºC, 60 ± 10% RH and 14 hours of photophase. Eggs of Anagasta kuehniella (Zeller) containing the parasitoid in different phases of development (egg-larva, pre-pupa and pupa) were treated by immersion in aqueous dilutions of the products. The insecticides triflumuron, chlorfluazuron, deltamethrin, Bacillus thuringiensis, lambdacyalothrin, abamectin, cartap and methamidophos, did not decrease the longevity of females T. pretiosum in F1 generation independently of the parasitoid strain. Abamectin, cartap, methamidophos and lambdacyalothrin affected the sexual ratio in F1, and did not decrease the emergence of parasitoids in F2 generation, independently of stage of development and origin. The L10 strain was more susceptible to all pesticides as compared to L9. The pupal stage of T. pretiosum was more tolerant to the products, independently of its origin. It is recommended new tests with other strains of this parasitoid which may respond differently to the products used, before field recomendations are made.