Preliminary investigation on the effects of biological and synthetic insecticides on large white butterfly (Pieris brassicae L.) larvae
2007
Klokocar-Smit, Z.D., Faculty of Agriculture, Novi Sad (Serbia). Department for Plant Protection and Environment | Indjic, D.V., Faculty of Agriculture, Novi Sad (Serbia). Department for Plant Protection and Environment | Vukovic, S.M., Faculty of Agriculture, Novi Sad (Serbia). Department for Plant Protection and Environment | Filipovic, M.M., AIC Tamis, Pancevo (Serbia) | Cervenski, J.F., Institute of Field and Vegetable Crops, Novi Sad (Serbia)
In the laboratory experiments we have investigated the effects of formulated synthetic pyrethroids cypermethrin (0.3 l/ha) and biological products - formulations based on Bacillus thuringiensis subsp. kursaki (2 and 3 l/ha) and Spinosad (0.1 l/ha) - on large white butterfly (Pieris brassicae L.) larvae-instars 2, 3, 4 and 5. The effect of insecticides was inversely proportional to larval instars. Btk effect could be improved if tank mixed with cypermethrin. Cypermethrin, potential endocrine disruptor, could be used at reduced rates if tank mixed with Btk and still produce satisfactory results. Spinosad, effective on all instars could be used at rates below 0.1 l/ha, which remains to be proved experimentally. Feeding rate and mortality are equally important when assessing efficacy of biopesticides. Btk could resolve the problem of cabbage protection in integrated and organic production. Organosilicone wetter Sillwett L-77 could be used on cabbage, as it did not affect adversely the effect of biological products.
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