Abstract

ARRUBLA M., Paula F.; CARDENAS R., Mauricio  and  POSADA F., Francisco J.. ADHERENCY OF Beauveria bassiana SPORES FORMULATED IN POWDER AND LIQUID TO THE COFFEE BERRY BORER. rev.udcaactual.divulg.cient. [online]. 2008, vol.11, n.1, pp.123-131. ISSN 0123-4226.

SUMMARY Traps with alcohol, as attractant, used to capture coffee berry borer adults (Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae) give the opportunity to deposit spores of Beauveria bassiana (Bals.) Vuill. (Ascomycota: Hypocreales) to auto-inoculate the adult attracted and to get the spores disseminated into the coffee field. Therefore, the aim of this study was to evaluate the capability of the coffee berry borer adult to pick up spores, in the form of powder, from a treated surface, suspension in oil [Kerosene, Carrier® and Kerosene+Carrier® (60:40)] and in sugar dilution at 5 and 10%. Three ways of adult exposition to the treated surfaces were evaluated. Adults walking on a surface treated with power allowed the beetles to pick up the highest number of spores. Second best expostition method was obtained when adults landed with open wings and the least efficient way of picking up spores was when they landed with closed wings. The most efficient formulation was spores applied as powder, followed by Carrier®, Kerosene+Carrier®, sugar in 5 and 10%. The lowest performance was obtained when the spores were applied using Kerosene alone.

Keywords : Formulation; entomopathogenic fungus; oil; application; coffee.

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