Efeito repelente de azadiractina e óleos essenciais sobre Aphis gossypii Glover (Hemiptera: Aphididae) em algodoeiro Repellent effect of azadirachtin and essential oils on Aphis gossypii Glover (Hemiptera: Aphididae) in cotton plants

Abstract

A repelência de inseticidas botânicos tem se destacado como uma tática promissora no controle alternativo de pragas agrícolas e urbanas, podendo ser um dos componentes do manejo integrado de pragas. Objetivou-se com este trabalho identificar a repelência de inseticidas botânicos sobre fêmeas ápteras de Aphis gossypii Glover. Testes com chance de escolha foram realizados com discos de folha de algodoeiro, imersos nas caldas dos inseticidas e testemunha (água destilada com DMSO a 2%). Utilizou-se azadirachtina (0,075%) e os óleos essenciais de Piper hispidinervum CDC, P. aduncum L., Cymbopogon winterianus (L.), C. citratus (D.C.) Stapf, Foeniculum vulgare Mill, Syzygium aromaticum (L.) Merrill e Perry, Cinnamomum zeylanicum Blume, Schinus terebinthifolius Raddi e Chenopodium ambrosioides L. na concentração de 0,05%. C. citratus, C. winterianus, P. aduncum, S. terebinthifolius, azadirachtina e C. zeylanicum apresentaram os maiores percentuais de repelência, 100; 84; 66,67; 64; 60,87 e 48% respectivamente e reduziram a produção de ninfas em 100; 92; 42,9; 87,5; 80,65 e 89,74%, apresentando resultados significativos pelo teste do &#967;2 ao nível de 10% de probabilidade. Nos testes com F. vulgare (&#967;2 = 3,66, P = 0,05) as fêmeas de A. gossypii foram atraídas significativamente para os discos tratados e ocorreu um aumento na produção de ninfas nos resultados obtidos para F. vulgare (&#967;2 = 5,87, P = 0,02) e C. ambrosioides (&#967;2 = 14,31, P = 0,001).<br>The repellence of botanical insecticides has emerged as a promising technique in the alternative control of urban and agricultural pests, being seen as one component of integrated pest management. The aim of this work was to identify the repellence of botanical insecticides on apterous females of Aphis gossypii Glover. Random-choice tests were carried out with discs from the leaves of cotton plants immersed in insecticide solution and in a control (distilled water with 2% DMSO). Azadirachtin was used (0.075%) and the essential oils of Piper hispidinervum CDC, P. aduncum L., Cymbopogon winterianus (L.), C. citratus (DC) Stapf, Foeniculum vulgare Mill, Syzygium aromaticum (L.) Merrill and Perry, Cinnamomum zeylanicum Blume, Schinus terebinthifolius Raddi and Chenopodium ambrosioides L. at a concentration of 0.05%. C. citratus, C. winterianus, P. aduncum, S. terebinthifolius, azadirachtin and C. zeylanicum showed the highest percentage of repellence, 100, 84, 66.67, 64, 60.87 and 48% respectively, and reduced nymph production by 100, 92, 42.9, 87.5, 80.65 and 89, 74%, with significant results from the &#967;2 test at 10% probability. In tests with F. vulgare (&#967;2 = 3.66, P = 0.05) females of A. gossypii were significantly attracted to the treated discs, and there was an increase in the production of nymphs in the results obtained for F. vulgare (&#967;2 = 5.87, P = 0.02) and C. ambrosioides (&#967;2 = 14.31, P = 0.001)

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