Transmissão de fungo entomopatogênico no controle da broca do rizoma

Abstract

ResumoO objetivo deste trabalho foi avaliar a transmissão do fungo entomopatogênico (Beauveria bassiana) entre adultos da broca do rizoma (Cosmopolites sordidus) em condições de campo. Insetos adultos e sadios de C. sordidus foram marcados e liberados na base de touceiras de bananeiras e dois dias após na mesma área foram liberados insetos marcados e inoculados com o fungo B. bassiana. Aos 7, 14, 21 e 28 dias armadilhas de pseudocaule foram utilizadas para a recaptura dos insetos e determinação da mortalidade pelo fungo. Observou-se uma porcentagem de infecção de 3,7% dos insetos sadios recuperados, caracterizando a transmissão de B. bassiana entre insetos inoculados e sadios devido ao aumento da prevalência natural preexistente que era de 0,3 % de insetos doentes. Palavras-chave: Beauveria bassiana, Cosmopolites sordidus, epizootia AbstractThe aim of this study was to assess the transmission of the entomopathogenic fungus Beauveria bassiana among adults of banana weevil (Cosmopolites sordidus) in the field. C. sordidus healthy adults were marked and released on the basis of banana plants. Two days later insects marked and inoculated with the entomopathogenic fungus were released in the same area. Pseudostem traps were placed at 7, 14, 21 and 28 days for recover of released insects and to evaluate the mortality. It was observed that 3.7% of the non inoculated insects died due to pathogen infection caracterizing B. bassiana transmission between inoculated and healthy insects due to an increase in natural pre-existing prevalescence that was 0.3% of infected insects.

Use of bioinsecticide and sugarcane molasses in the management of Cosmopolites sordidus (Germar) and Metamasius spp. (Horn)

“…Dolinski & Lacy (2007) carried out a review on the use of entomopathogens in the control of tropical fruit insects and showed that the control of the banana weevil borer can be performed successfully by using these control agents. López et al (2012), who studied the transmission of the entomopathogenic fungus Beauveria bassiana in the control of C. sordidus, released healthy insects and later insects inoculated with the fungus. When recapturing the insects, they observed an infection rate of 3.7%, characterizing transmission between inoculated and healthy insects due to the increase in the pre-existing natural prevalence, which was only 0.3% of sick insects.…”