Persistência de agrotóxicos utilizados na cultura do milho ao parasitoide Trichogramma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae)

the high yields in corn have been achieved due to various technical factors, being the pest control one of the most important. in this way, the objective was to evaluate the persistence of the pesticides used in corn field to the parasitoid trichogramma pretiosum. it was evaluated the persistence of seven insecticides and three fungicides, which were separately diluted to 200l of water and sprayed on the vine leaves. these leaves were taken to the laboratory and used into cages at 3, 10, 17, 24 and 31 days, where remained confined the adults of the parasitoids to contamination. the adult mortality of t. pretiosum was measured according to the lower number of parasitized eggs of alternative host anagasta kuehniella. the results were compared with the witness treatment and pesticides classified according to iobc categorization. four replicates for each treatment were used. the fungicides opera, priori xtra and folicur 200 ec were short life (class 1). the insecticides match ec and sumithion 500 ce were short life (class 1); lorsban 480 br and safety were moderately persistent (class 3), and engeo pleno, karate zeon 50 cs and tracer were persistent (class 4) to adults of t. pretiosum.