Produtos naturais e sintéticos no controle de Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) (Lepidoptera: Lyonetiidae) e seus efeitos sobre a predação por vespas
Data
2006-09
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Editor
Editora UFLA
Resumo
O controle do bicho-mineiro-do-cafeeiro Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) é realizado por meio de inseticidas de amplo espectro de ação, capazes de causar desequilíbrios biológicos, sendo importante a busca por produtos que apresentem toxicidade à praga e seletividade aos seus inimigos naturais. Objetivou-se, com este trabalho, avaliar a ação dos produtos naturais, extrato pirolenhoso Biopirol ® a 2,0; 4,0; 8,0 e 16,0% e azadiractina Nim-I-Go ® a 0,25; 0,50; 0,75 e 1,0% em comparação com os inseticidas sintéticos lambdacialotrina (0,01 mg i.a./mL) e etion (1,5 mg i.a./mL) sobre o bicho-mineiro e seus efeitos sobre vespas predadoras desta praga, em condições de campo. Para isto, foi instalado um experimento em uma área de aproximadamente 1,2 ha, em lavoura cafeeira da cultivar Catuaí Vermelho, situada em Lavras, MG. As concentrações do extrato pirolenhoso e de azadiractina avaliadas não controlaram o bicho-mineiro e não afetaram negativamente a capacidade predatória das vespas. Observou-se que etion causou efeito letal às lagartas, logo após sua aplicação, decrescendo ao longo do tempo. Lambdacialotrina apresentou menor toxicidade às lagartas logo após sua aplicação, seguido por um aumento significativo de controle da praga ao longo do tempo.
The control of the coffee leaf miner Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) by broad spectrum pesticides can cause great ecological problems. Thus, the search for products with low toxicity and that do not affect natural enemies is necessary. The objective of the present work was to evaluate the action of natural products like pyroligneous extract Biopirol ® (2.0; 4.0; 8.0 and 16.0%) and azadirachtin Nim-I-Go ® (0.25; 0.50; 0.75 and 1.0%) and the pesticides lambdacyhalothrin (0.01 mg a.i./mL) and ethion (1.5 mg a.i./ mL) over coffee leaf miner and their effects over predator wasps, under field conditions. In order to achieve that, an experimental field of around 1,2 ha was installed, in a coffee plantation of the cultivar Catuaí Vermelho, in Lavras, MG. It was noted that the concentrations of pyroligneous extract and azadirachtin did not control the leaf miner and did not affect the predation for wasps. However, the larvae were killed by ethion, right after its application, being the effect weaker as the time passed. Lambdacyhalothrin presented the lower toxicity to the larvae after its application, followed by a significant increase in the control along the time.
The control of the coffee leaf miner Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) by broad spectrum pesticides can cause great ecological problems. Thus, the search for products with low toxicity and that do not affect natural enemies is necessary. The objective of the present work was to evaluate the action of natural products like pyroligneous extract Biopirol ® (2.0; 4.0; 8.0 and 16.0%) and azadirachtin Nim-I-Go ® (0.25; 0.50; 0.75 and 1.0%) and the pesticides lambdacyhalothrin (0.01 mg a.i./mL) and ethion (1.5 mg a.i./ mL) over coffee leaf miner and their effects over predator wasps, under field conditions. In order to achieve that, an experimental field of around 1,2 ha was installed, in a coffee plantation of the cultivar Catuaí Vermelho, in Lavras, MG. It was noted that the concentrations of pyroligneous extract and azadirachtin did not control the leaf miner and did not affect the predation for wasps. However, the larvae were killed by ethion, right after its application, being the effect weaker as the time passed. Lambdacyhalothrin presented the lower toxicity to the larvae after its application, followed by a significant increase in the control along the time.
Descrição
Palavras-chave
Bicho-mineiro, Controle quÍmico, Vespas predadoras, Seletividade
Citação
MENDONÇA, J. M. A. et al. Produtos naturais e sintéticos no controle de Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) (Lepidoptera: Lyonetiidae) e seus efeitos sobre a predação por vespas. Ciência e Agrotecnologia, Lavras, v. 30, n. 5, p. 892-899, set./out. 2006.