Persistência de agrotóxicos utilizados na produção integrada de maçã a Trichogramma pretiosum

Abstract

In the Integrated Production of Apple (IPA) the biological control is an important control tactics, however, it may be limited by the use of pesticides. Thus, the objective of this work was to evaluate the persistence (duration of harmful activity) of ten pesticides indicated in the IPA on the egg parasitoid Trichogramma pretiosum. Insect adults were exposed to pesticide residues on the leaves of vine cv. Isabel. The residue effect was evaluated on parasitism of T. pretiosum, at 3, 10, 17, 24 and 31 days after the treatment, using the IOBC standard methodology. The reduction in capacity of parasitism of T. pretiosum was used to measure the effect of the pesticides. The results showed that the products, commercial name/active ingredient (g or mL commercial formulation.100 L-1), insecticide Malathion® 1000 CE/malathion (100) and the fungicides Domark® 100 CE/tetraconazol (50), Manzate® 800 /mancozeb (200), Mancozeb Sipcam® /mancozeb (200) and Metiltiofan® /thiophanate-methyl (90) were classified as short lived (< 5 days); the insecticide/acaricid Vertimec® 18 CE/abamectin (100) as slightly persistent (5-15 days of harmful action), the insecticide Lorsban® 480 BR/chlorpyrifos (150) as moderately persistent (16-30 days of harmful action), the insecticides Imidan® 500 PM/phosmet (200) and Sevin® 480 SC/carbaryl (360) and the fungicide/acaricid Kumulus® DF/sulphur (600) were persistent (> 31 days of harmful action) to T. pretiosum.