Tropical Ecology and Conservation [Monteverde Institute]

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Publication Date

September 2000

Abstract

This study examined the use of the fungus Beauveria bassiana as a biological alternative to chemical insecticides for the cauliflower pest Plutella xylostella. Potential secondary effects of B. bassiana on several local wild butterfly pollinators in Monteverde, Costa Rica were also investigated. Larvae of P. xylostella (Plutellidae), Actinote leucomeles (Acraeinae), Pteronymia notilla (Ithomiinae) and a morpho species of Nymphalidae were collected and treated with the same concentration of B. bassiana fungus used on cauliflower crops in the Estación Biológica Monteverde greenhouse. Mortality of treated larvae was significantly higher than untreated larvae for P. xylostella (Chi-squared p < 0.001), while no difference was found for the three species of treated Nymphalidae larvae. These results support the idea that the use of biological alternatives such as B. bassiana may have fewer adverse secondary effects on the environment than chemical insecticides. Este estudio examine el uso de Beauveria bassiana como una alternative biológica a los insecticidas químicas para la plaga de la coliflor Plutella xylostella. Tambien, este estudio investigo el efectos de este hongo sobre otros lepidópteras locales que sirven como polinizadores de plantas en Monteverde, Costa Rica. Larvas de P. xylostella (Plutellidae), Actinote leucomeles (Acrainae), Pteronymia notilla (Ithomiinae) y otro especie de la familia Nymphalidae, fueron colectadas y se trataron con B. bassiana en la misma proporción que se usa en la invernáculo de la Estación Biológica Monteverde. Un porcentaje de mortalidad mayor se encontro en P. xylostella que se trataron con el hongo (Chi-squared test, p < 0.001) pero el porcentaje de mortalidad no fue significativo para las tres otras especies que se trataron con hongo. Estos resultados apoyan la idea del uso de alternativas biológicas como B. bassiana tiene menos efectos al ambiente que los químicos.

Description

Student affiliation: Department of Biology, University of Minnesota at Morris Digitized by MVI

Genre

Reports

Holding Location

Monteverde Institute MVI

Identifier

M39-00046

Effects of entomopathonogenic fungus Beauveria bassiana on Plutella xylostella and Nymphalidae larvae

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