Controle biológico de Diatraea flavipennella Box, 1931 e D. saccaharalis (Fabricius, 1794) (Lepidoptera: Crambidae) e seletividade de produtos fitossanitários a Trichogramma galloi Zucchi, 1988 (Hymenoptera: Trichogrammatidae)

Abstract

This study investigated the biological control agents of borers of genus Diatraea spp. In its various aspects. The research consisted in the developmentof the life table and fertility as well, study the biological aspects of T. galloi Zucchi, 1988 (Hymenoptera: Trichogrammatidae) and their preference regarding the borers Diatraea flavipennella Box, 1931 and D.saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae). Furthermore, we evaluated the selectivity of the herbicide paraquat dichloride (Gramoxone®), ametryn (Metrimex®), metribuzin (Sencor 480®), tebuthiuron (Combine®); of insecticides imidacloprid (Evidence®) and phenylpyrazol (Curbix®) and the fungus M. anisopliae (isolated Triunfo) on immature stages of T.galloi. Regarding the larval parasitoid C. flavipes, we sought to elucidate part of the questions regarding is preference for his native host, D. saccharalis. To test the hypothesis that preferably of C. flavipes for D. saccharalis olfactometer tests were performed using volatile organic compounds extracted from plants healthy (noinfestation) and infested separately with both borers. As a result: the tests free choice showed a possible preferably T. galloi by eggs of D. flavipennella. There was no significant difference between the biological parameters of the parasitoid in both host species. The fertility life table showed good performance of T.galloi in boths pecies. With respect to selectivity tests, the herbicide paraquat dichloride presented selective T. galloi under laboratory conditions. The other products tested showed negative effects in at least two developmental stages of T. galloi should be used with caution in culture. With respect to C. flavipes response to the extracted volatile sugarcane infested plants with both hosts, the results showed no preference to this parasitoid to D. saccharalis, being even able to locate the two host species.