Seletividade de acaricidas utilizados em cafeeiro para larvas de crisopídeos
Data
2010-09
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Editor
Universidade Federal de Viçosa
Resumo
Os crisopídeos são encontrados em agroecossistema cafeeiro alimentando-se de várias pragas. Objetivou-se avaliar a seletividade de acaricidas utilizados na cafeeiculta sobre a biologia de Chrysoperla externa (Hagen, 1861). Os tratamentos foram: testemunha (água), espirodiclofeno (0,12 g i.a./L), fenpropatrina (0,15 e 0,30 g i.a./L), enxofre (4,0 e 8,0 g i.a./L) e abamectina (0,0067 e 0,0225 g i.a./L). Pulverizaram-se os produtos sobre larvas de primeiro, segundo e terceiro instares de C. externa por meio da torre de Potter. Avaliaram-se a duração do instar, sobrevivência das larvas e pupas e viabilidade dos ovos produzidos pelos adultos provenientes das larvas tratadas. Os produtos foram classificados em classes de toxicidade. Fenpropatrina foi nocivo e espirodiclofeno e abamectina foram moderadamente nocivos, necessitando de novos estudos em condições de casa de vegetação e campo para confirmação ou não de suas toxicidades. Em função da baixa toxicidade apresentada pelo enxofre ao predador C. externa, pode ser recomendado em programas de manejo de pragas do cafeeiro visando compatibilizar os métodos químico e biológico por meio dessa espécie de crisopídeo.
Green lacewings are commonly found in coffee agroecosystems feeding on several pests of economic importance. The objective of this study was to evaluate the selectivity of acaricides used in coffee crop to Chrysoperla externa (Hagen, 1861). The treatments consisted of control (water), spirodiclofen (0.12 g a.i./L), fenpropathrin (0.15 and 0.30 g a.i./L), sulphur (4.0 and 8.0 g a.i./L) and abamectin (0.0067 and 0.0225 g a.i./L). The products were sprayed directly on first, second and third-instar larvae of C. externa, using a Potter spray tower. Duration of instar, survival of larvae and pupae and viability of eggs produced by the adults emerged from the treated larvae were evaluated. The pesticides were classified into toxicity classes. Fenpropathrin was toxic and spirodiclofen and abamectin were moderately toxic, requiring further studies under greenhouse and field conditions to confirm or not their toxicities. Because of the low toxicity of sulphur to the predator C. externa, it can be recommended for coffee pest management programs in order to combine chemical and biological control using this Chrysopidae species.
Green lacewings are commonly found in coffee agroecosystems feeding on several pests of economic importance. The objective of this study was to evaluate the selectivity of acaricides used in coffee crop to Chrysoperla externa (Hagen, 1861). The treatments consisted of control (water), spirodiclofen (0.12 g a.i./L), fenpropathrin (0.15 and 0.30 g a.i./L), sulphur (4.0 and 8.0 g a.i./L) and abamectin (0.0067 and 0.0225 g a.i./L). The products were sprayed directly on first, second and third-instar larvae of C. externa, using a Potter spray tower. Duration of instar, survival of larvae and pupae and viability of eggs produced by the adults emerged from the treated larvae were evaluated. The pesticides were classified into toxicity classes. Fenpropathrin was toxic and spirodiclofen and abamectin were moderately toxic, requiring further studies under greenhouse and field conditions to confirm or not their toxicities. Because of the low toxicity of sulphur to the predator C. externa, it can be recommended for coffee pest management programs in order to combine chemical and biological control using this Chrysopidae species.
Descrição
Palavras-chave
Chrysoperla externa (Hagen, 1861), Coffea arabica L., Pesticidas, Toxicidade
Citação
VILELA, M. et al. Seletividade de acaricidas utilizados em cafeeiro para larvas de crisopídeos. Revista Ceres, Viçosa, v. 57, n.5, p. 621-628, set/out, 2010