POTENCIAL INSETICIDA DOS ÓLEOS ESSENCIAIS DE CITRUS E MANGA E CONSTITUINTES SELECIONADOS SOBRE MOSCA BRANCA

Palavras-chave: Atividade inseticida. Fumigação. Fecundidade. Limoneno. Terpinoleno.

Resumo

Bemisia tabaci é uma praga cosmopolitas e responsável por causar prejuízos aos agricultores no Polo agrícola de Petrolina-PE. Os efeitos letal e subletal do vapores dos óleos essenciais obtidos por hidrodestilação de quatro espécies de Citrus e do látex Mangifera indica var. rosa e espada, foram investigados sobre B. tabaci. Análise química por GC-MS dos óleos permitiu a identificação de 71 constituintes, sendo limonene o principal dos óleos de Citrus e terpinolene para os de M. indica. A susceptibilidade de B. tabaci foi maior para os óleos de C. aurantiifolia (CL50 = 0,70 µL L-1 air) e C. limon (CL50 = 1,77 µL L-1 air), que apresentaram o mesmo nivel de toxicidade entre si. Além da toxicidade, os óleos de Citrus e M. indica também atuaram na redução da fecundidade de B. tabaci. A ação letal e subletal dos constituintes, Linalool, α-terpineol, α-pinene, β-pinene, terpinolene and limonene também é discutida. A toxicidade associada com a redução da fecundidade dos óleos aqui investigados é uma grande vantagem para o manejo de B. tabaci. No entanto, para o uso prático destes óleos como novo inseticida, mais pesquisas são necessárias sobre questões de segurança para a saúde humana e formulação para melhorar a potencialidade inseticida, estabilidade e custo benéfico.

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Publicado
2020-02-14
Seção
Agronomia