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The aim of this work was to evaluate the influence of the enzyme cholesterol oxidase (Coase) on emergence and viability of larvae of the cotton boll weevil (Anthonomus grandis Boheman, 1843). A series of bioassays was performed with eggs and neonate larvae exposed to different enzyme concentrations in artificial diet. Larval survival was affected at all enzyme concentrations tested, and the six-day LD50 was 53 mug/mL (CI 95%: 43-59). Coase also interfered with hatching of larvae after eggs were floated for 15 min in Coase solution at different concentrations. Observations at the light and electronic microscopic level of midguts from larvae fed on artificial diet containing 53 mug/mL of Coase and collected at six days revealed highly vacuolated regions in the epithelial cells as well as partial degradation of the basal membrane and microvilli. O objetivo desse trabalho foi avaliar a influência da colesterol oxidase (Coase) na eclosão e viabilidade de larvas do bicudo-do-algodoeiro (Anthonomus grandis Boheman, 1843). Uma série de bioensaios foram conduzidos com ovos e larvas neonatas, os quais foram expostos a diferentes concentrações da enzima em dieta artificial. A sobrevivência das larvas foi afetada em todas as concentrações testadas, e a DL50, no sexto dia, foi de 53 mig/mL (IC 95%: 43-59). A Coase também interferiu na eclosão das larvas quando os ovos foram submersos por 15 min em solução de Coase, em diferentes concentrações. Observações feitas ao microscópio de luz e eletrônico no intestino médio das larvas alimentadas durante seis dias com dieta artificial contendo 53 mig/mL de Coase revelou regiões altamente vacuolizadas nas células epiteliais, bem como degradação parcial das membranas basal e microvilli

Cholesterol oxidase interference on the emergence and viability of cotton boll weevil larvae