Tuesday, 19 November 2002
D0374

This presentation is part of : Display Presentations, Subsection Ce. Insect Pathology and Microbial Control

Susceptibility of a native and an exotic lady beetle (Coleoptera: Coccinellidae) to Beauveria bassiana

Ted Cottrell and David I. Shapiro-Ilan. USDA-Agricultural Research Service, Southeastern Fruit and Tree Nut Research Laboratory, 21 Dunbar Road, Byron, GA

The native Olla v-nigrum (Mulsant) and the exotic Harmonia axyridis (Pallas) are the predominant coccinellids found in pecan orchards in the Southeastern U.S. Adult O. v-nigrum in pecan orchards are commonly found infected with Beauveria bassiana, especially when overwintering under pecan bark. We have never observed such infection in adult H. axyridis. Three B. bassiana isolates were obtained from field-collected O. v-nigrum and a fourth from a commercially-available formulation. Toxicity of conidia from these B. bassiana isolates was tested against lab-reared O. v-nigrum adults at concentrations of 104 to 108 conidia/ml for 8 days to establish an LC50. Subsequent tests against both O. v-nigrum and H. axyridis showed that mortality of O. v-nigrum was always higher than H. axyridis mortality, especially for the isolates obtained from O. v-nigrum.



Species 1: Coleoptera Coccinellidae Olla v-nigrum
Species 2: Coleoptera Coccinellidae Harmonia axyridis (multicolored Asian lady beetle)
Species 3: Deuteromycotina Hyphomycetes Beauveria bassiana
Keywords: exotic, pecan

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