O ÓLEO ESSENCIAL DE FOLHAS DE Croton pulegiodorus Baill APRESENTA ATIVIDADE INSETICIDA SOBRE Sitophilus zeamais Motschulsky

Palavras-chave: Produtos naturais. Euphorbiaceae. Curculionidae. Milho armazenado.

Resumo

O presente estudo teve o objetivo de avaliar os efeitos do óleo essencial de Croton pulegiodorus Baill sobre oito populações de Sitophilus zeamais Motschulsky com diferentes padrões de susceptibilidade a inseticidas sintéticos. As populações foram obtidas de Sete Lagoas-MG, Jacarezinho-PR, Bom Conselho-PE, Garanhuns-PE, Jupi-PE, Lajedo-PE, São João-PE e Serra Talhada-PE. Para estimar as concentrações letais (CL50 e CL90) do óleo para cada população, foram realizados testes de fumigação. A susceptibilidade de S. zeamais ao óleo essencial variou entre as populações. Garanhuns e Bom Conselho foram considerados padrões de susceptibilidade, apresentando as menores CL50 (3,40 μL L-1 de ar) e CL90 (9,60 μL L-1 de ar) para C. pulegiodorus.  A população de Jupi apresentou as maiores CL50 (14,49 μL L-1 de ar) e CL90 (19,60 μL L-1 de ar) para C. pulegiodorus. A razão de resistência variou de 1,84 vezes para população de São João a 4,26 vezes para a população de Jupi. Assim, o óleo essencial de C. pulegiodorus apresentou efeito fumigante causando mortalidade em todas as populações de S. zeamais utilizadas.

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Publicado
2019-05-16
Seção
Agronomia