Seletividade de acaricidas utilizados em cafeeiro para larvas de crisopídeos

Abstract

Seletividade de acaricidas utilizados em cafeeiro para larvas de crisopídeos Rev. Ceres, Viçosa, v. 57, n.5, p. 621-628, set/out, 2010 RESUMO ABSTRACTS Selectivity of acaricides used in coffee crops to green lacewingGreen 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. Seletividade de acaricidas utilizados em cafeeiro para larvas de crisopídeosOs 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. Palavras-chave:Chrysoperla externa (Hagen, 1861), Coffea arabica L., pesticidas, toxicidade.

50 Management of Coffee Leaf Miner: Spray Volume, Efficacy of Cartap Hydrochloride and Impact on Parasitism

“…Most of the studies available in the literature on the selectivity of insecticides to the natural enemies of the coffee tree, approach the selectivity in favor of predators, such as the predatory wasps of leaf miner (GUSMÃO et al, 2000;FRAGOSO et al, 2001), chrysopides (VILELA et al, 2010) and lady bug (ROCHA et al, 2010;. In other cultures, studies have shown that cartap may reduce parasitism (PASINI et al, 2017) and affect the sex ratio (CARVALHO et al, 2003) of Trichogramma pretiosum Riley in tomato.…”

“…Integrated pest management has one of its basic components in the selectivity of insecticides, allowing the preservation of natural enemies. Studies on the selectivity of phytosanitary products recorded for coffee cultivation have been specifically developed in favor of predators (ROCHA et al, 2010;VILELA et al, 2010;CASTILHOS et al, 2017), and there is a lack of information about the effects on parasitoids.…”

Resistance Potential of <i>Chrysoperla carnea</i> (Stephens) to Insecticides Used Against Sucking Complex of Cotton

“…Theoretically, few studies have been addressed that all developmental stages (eggs, larva, pupa, and adult) of green lacewing are susceptible to insecticides, the exposure may lead to lethal and sub-lethal effects [7,12]. Most of the studies highlighted lethal and sub-lethal effects of selective insecticides on larvae and adult lacewing [13][14][15], and some have focused on eggs and pupae that can be considered more tolerant to insecticides [6,16,17].…”