Carlos Henrique Martins de Menezes, Angelica Plata-Rueda, José Cola Zanuncio, José Eduardo Serrão, Luis Carlos Martínez
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引用次数: 0
Abstract
The velvetbean caterpillar (VBC), Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae), is a significant soybean pest in the Americas and controlled mainly with chemical insecticides. Toxicity, survival, respiration, and anti-feeding effect of the VBC larvae exposed to four neurotoxic insecticides (α-cypermethrin, abamectin, chlorpyrifos, and thiamethoxam) by ingestion were evaluated. Toxicity bioassays demonstrated that abamectin (LC50 = 0.097 g L–1), thiamethoxam (LC50 = 0.537 g L–1), and chlorpyrifos (LC50 = 1.998 g L–1) were toxics to VBC. The survival rate was 98% in control caterpillars, declining to 35% in larvae exposed to LC50 of thiamethoxam, 26% in larvae treated with chlorpyrifos, 23% in larvae treated with abamectin, and 10% in those treated with α-cypermethrin. The neurotoxic insecticides reduced low respiration rates and produced feeding inhibition in VBC caterpillars. Our results suggest that abamectin, α-cypermethrin, chlorpyrifos, and thiamethoxam are highly effective against VBC and may be implemented to manage its populations in soybean crops.
期刊介绍:
Phytoparasitica is an international journal on Plant Protection, that publishes original research contributions on the biological, chemical and molecular aspects of Entomology, Plant Pathology, Virology, Nematology, and Weed Sciences, which strives to improve scientific knowledge and technology for IPM, in forest and agroecosystems. Phytoparasitica emphasizes new insights into plant disease and pest etiology, epidemiology, host-parasite/pest biochemistry and cell biology, ecology and population biology, host genetics and resistance, disease vector biology, plant stress and biotic disorders, postharvest pathology and mycotoxins. Research can cover aspects related to the nature of plant diseases, pests and weeds, the causal agents, their spread, the losses they cause, crop loss assessment, and novel tactics and approaches for their management.