Journal of Biological Control

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Five entomogenous fungi were bioassayed for their Infectivity to second instar larvae of Heliothis armigera Hbn, by spraying them with the conidial suspension in the laboratory. Of them, Beauveria bassiana (Bals.) Vuill. (Bapatla isolate) was found to be the most virulent recording the lowest LC50 of 2.17 × 105 conidia ml-1. The LC50 values of the Bangalore and New Delhi Isolates of B. bassiana, Paecilomyces fumosoroseus (Wize) Brown and Smith and P. farinosus (Holm ex Gray) Brown and Smith ranged from 4.19 × 108 to 5.22 × 109 conidia ml-1. Bioassay of second, third and fourth Instar larvae of H. armigera for their susceptibllity to Bapatla Isolate of B. bassiana showed that susceptibility decreased with age of the larvae in terms of both LC50 and LT50.

Keywords

Beauveria bassiana, Paecilomyces farinosus, P. fumosoroseus, Heliothis armigera, Susceptibility.
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