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On-line version ISSN 1678-4596
MORANDI FILHO, Wilson José et al. Action of natural products on the survival of Argyrotaenia sphaleropa (Meyrick) (Lepidoptera: Tortricidae) and selectivity of insecticides used in the organic production of vine on Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae). Cienc. Rural [online]. 2006, vol.36, n.4, pp. 1072-1078. ISSN 1678-4596. http://dx.doi.org/10.1590/S0103-84782006000400005.
This work was conducted to study the effect of commercial formulations of insecticides with emphasis on that allowed in the organic production (neem, natural piretro and pirolenhoso extract) to control Argyrotaenia sphaleropa (Meyrick) (Lepidoptera: Tortricidae) and their performance on the egg parasitoid Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) adults. The insecticides Natuneem® (1500ppm of azadirachtin L-1) and the pirolenhoso extract (Biopirol 7 M®) (250 and 500mL 100L-1) were not efficient in the control of A. sphaleropa when applied over grapevine leaves (Vitis sp.) cultivate Chardonnay. Natural piretro (250 and 500mL 100L-1) resulted in a mortality of 77.65 and 85.88% of insects, respectively 120 hours after application. The secondary effect of insecticides allowed was evaluated on adults of the egg parasitoid T. pretiosum following International Organization for Biological and Integrated Control (IOBC) methodology. It was observed that Natuneem® (500mL 100L-1), Biopirol 7 M® (500mL 100L-1) and Dipel DF® (100g 100L-1) had been innocuous (<30% parasitism reduction) while natural piretro (250mL 100L-1) was classified as moderately harmful (80-99% of parasitism reduction). Natural piretro in the higher dose (500mL 100L-1) showed a parasitism reduction in more than 99% in the same way that the pattern Lebaycid 500® (100mL 100 L-1).
Keywords : organic insecticides; grape; secondary effects; egg parasitoid.