Journal of Biological Control

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Susceptibility of Gram Caterpillar, Heliothis armigera Hbn. (Noctuidae:Lepidoptera) to Certain Entomogenous Fungi


Affiliations
1 Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore- 641 003, India
 

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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  • Susceptibility of Gram Caterpillar, Heliothis armigera Hbn. (Noctuidae:Lepidoptera) to Certain Entomogenous Fungi

Abstract Views: 211  |  PDF Views: 111

Authors

V. DevaPrasad
Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore- 641 003, India
S. Jayaraj
Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore- 641 003, India
R. J. Rabindra
Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore- 641 003, India

Abstract


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.