Ação de extratos vegetais sobre Trichogramma galloi (Zucchi, 1988) (Hymenoptera: Trichogrammatidae).

The plants extract may be compatible with other management tactics, especially with biological control. so the aim of this work was to evaluate the residual effect of several extracts from cedar tree (C) and mahogany tree (M) (bark (C), wood (M) and leaf (F); cecropia tree (I) (bark - C and wood - M) and of the pereiro (P) (bark -C), and its possible effects on the adults of the parasitoid Trichogramma galloi(Zucchi, 1988) (Hymenoptera: Trichogrammatidae). Cards containing parasitised eggs of Diatraea saccharalis(Fabricius, 1794) (Lepidoptera: Crambidae), or containig eggs that would be submitted to the parasitoid were immersed for 30 seconds in the extracts at 5000 μg.mL-1. The number of parasitised eggs and adult emergence of the parasitoid were evaluated. The highest rates of parasitism, up to 60.0%, was obtained by the control treatment, MC, MM, CC and MF, and the treatments that caused a lower percentage of parasitism, IC, IM, PC, CM and CF, respectively. The extracts of different parts of mahogany, which showed a good percentage of parasitism, affected the development of the parasitoid with a low adult emergence. The PC showed a lower parasitism and emergence. In relation to eggs treated four days after parasitism, it was found that the control treatment had a good average in emergency (98.85%), in the same category of treatments IM, CF and CC, respectively. The CC extract was more selective and the PC was the least selective for T. galloi. [ABSTRACT FROM AUTHOR]