Selection of a Highly Virulent Verticillium lecanii Strain Against Trialeurodes vaporariorum at Various Temperatures

Abstract

The virulence of five Verticillium lecanii strains against greenhouse whiteflies, Trialeurodes vaporariorum, was tested at various temperatures as a major environmental factor. Strain CS-626 was found to be the most durable strain at a broad temperature range, and highly virulent against greenhouse whiteflies in a detached-leaf bioassay. In a tomato plant pot experiment, the LT 50 and LC 50 of the CS-626 strain were 6.2 days and 2.3×10 6 conidia/ml, respectively. The optimal concentration of CS-626 for successful infection was 1×10 8 conidia/ml. These results indicate that the CS-626 strain of Verticillium lecanii has a strong potential for effectively controlling greenhouse whiteflies.