RESUMO -Foi avaliada a infecção de larvas de Conotrachelus humeropictus Fiedler, séria praga do cacaueiro (Theobroma cacao L.) e do cupuaçuzeiro (T. grandiflorum (Willd. ex Spreng.) Schum.) na Amazônia brasileira, por Metarhizium anisopliae (Metsch.) Sor. e Beauveria bassiana (Bals.) Vuill. A pesquisa foi desenvolvida nos campos experimentais da Comissão Executiva do Plano da Lavoura Cacaueira -CEPLAC, em Ouro Preto D'Oeste, Rondônia. Foram testadas suspensões de 3,93 χ 10 10 conídios/ml de M. anisopliae e 4,26 χ 10 10 conídios/ml de B. bassiana, pulverizadas superficialmente em solo contido em recipientes de PVC, onde em diferentes dias após a pulverização (um, três, sete e quatorze dias) liberou-se larvas do último ínstar da praga. Beauveria bassiana mostrou-se mais eficiente (52,0% de mortalidade) do que M. anisopliae (42,7%), evidenciando assim, seu maior potencial no controle da praga. Os índices de mortalidade foram estatisticamente iguais para larvas liberadas até o 7º dia da contaminação, decrescendo significativamente no 14º dia. A queda na efetividade pode estar associada à presença de microrganismos antagonistas no solo. Palavras-chave: Controle biológico, insecta, Theobroma cacao, Theobroma grandiflorum Infection of Conotrachelus humeropictus Fiedler (Coleoptera: Curculionidae) by Metarhizium anisopliae (Metsch.) Sor. and Beauveria bassiana (Bals.) Vuill. in the SoilABSTRACT -The infection of Conotrachelus humeropictus Fiedler, a serious pest of cocoa and cupuaçu fruit in the Brazilian Amazon, by Metarhizium anisopliae and Beauveria bassiana was evaluated. The research was conducted in a field station of the Comissão Executiva do Plano da Lavoura Cacaueira -CEPLAC, in Ouro Preto d'Oeste, Rondônia. Suspensions of 3.93 χ 10 10 conidia/ml of M. anisopliae and 4.26 χ 10 10 conidia/ml of B. bassiana were superficially sprayed on soil in PVC flasks. One, three, seven and fourteen days after spraying the last larval instar were released. Beauveria bassiana was more eficient (52.0% mortality) than M. anisopliae (42.7%). The mortalities were the same for larvae liberated until the 7 th day after contamination, and were significantly lower on the 14 th day. The decline in the efficacy of the pathogens may be related to the presence of antagonic organisms in the soil.
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