Efeito letal de formulações de fungos entomopatogênicos e inseticida químico sobre Cosmopolites sordidus germar (coleoptera: curculionidae)

Abstract

Bananas (Musa spp.), one of the world's most consumed fresh fruits, are found in practically every part of the world. Its cultivation is a lucrative activity practised throughout Brazil and is of great social and economic importance. However, banana production is limited by biotic and abiotic factors. Among the biotic factors is the occurrence of the banana mould (Cosmopolites sordidus). In an attempt to minimise the damage caused by this coleobroca, the aim of this study was to verify the pathogenic action of different concentrations of fungal formulations and the efficiency of chemical insecticides on adults of C. sordidus. To this end, adult banana moth insects were collected using tile-type traps in an experimental plantation at CECA-UFAL. The biological insecticide used was the fungus B. bassiana, isolate CBMAI 1306 and a mixture of two fungi (Metarhizium anisopliae IBCB 425 + B. bassiana IBCB 66) and the chemical insecticide Deltamethrin. All in five concentrations and distilled water as a control. The biological insecticides were applied directly and indirectly and assessed for mortality every five days until the 25th day. On the other hand, the chemical insecticide was only applied directly and evaluated daily for five days. The results show that the fungi, whether applied directly or indirectly at all concentrations, are pathogenic to C. sordidus adults. However, direct application proved to be more efficient in controlling the banana mould compared to indirect application. Delamethrin proved effective at all the concentrations tested, controlling all the insects at the three highest concentrations. With this, it can be concluded that the use of entomopathogenic fungi B. bassiana, isolate CBMAI 1306 and Metarhizium anisopliae IBCB 425 + B. bassiana IBCB 66 and the chemical insecticide Deltamethrin, has potential for use in the integrated management of the banana plant hopper.