ABSTRACT:Lepidopteran pests are one of the major constraints to the soybean production potential, whose defoliating caterpillars can occur throughout the crop cycle causing serious damage. Therefore, the objective was to study the population fluctuation of lepidopteran pests and the association of species with the growth stages of soybean cultivars in the Cerrado of Piaui State, Brazil, in order to obtain data to support integrated pest management in the crop. The experiments had as a source of variation thirteen cultivars with fourteen evaluations. The design used was completely randomized in split plots being the cultivars plots and subplots the cultivars phenological stages. The monitoring was conducted by shake-cloth method at random points. Weekly samplings were performed. Generally, species of lepidopteran pests occurred in all soybean phenological stages, especially Chrysodeixis includens and Anticarsia gemmatalis that were present from the beginning to the end of the crop.
ResumoO uso de extratos vegetais apresenta grande eiciência no manejo de pragas, destinados a produções agrícolas de pequeno e médio porte, por controlar uma gama muito grande de artrópodes. O objetivo desta pesquisa consiste em avaliar os efeitos tóxicos dos extratos de Anadenanthera macrocarpa (Fabaceae: Mimosoideae) e Bougainvillea buttiana (Nyctaginaceae) em Helicoverpa armigera (Hübner), Spodoptera cosmioides (Walker) e Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae). Lagartas de H. armigera e S. cosmioides foram mantidas em discos foliares de soja, enquanto S. frugiperda foi mantida em discos foliares de milho, tratados com os extratos aquoso diluídos nas concentrações de: 0, 500, 1.000, 2.500, 4.000, 5.000, 10.000 e 15.000 mg.L ), respectivamente. A redução da emergência dos adultos foi o principal efeito subletal constatado em S. cosmioides e S. frugiperda. Considerando os resultados obtidos, destaca-se que os extratos vegetais utilizados apresentam-se como uma alternativa em potencial para o manejo de lepidópteros-praga.Palavras-chave: Angico-preto; Lagartas desfolhadoras; Três-marias AbstractToxicity of Anadenanthera macrocarpa (Fabaceae: Mimosoideae) and Bougainvillea buttiana (Nyctaginaceae) extracts to lepidopteran pests. For small and medium agricultural production, vegetal extracts
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