T. Abdul Razak ¹, C. V. Sivakumar ¹

Affiliations
1 Department of Nematology, Tamil Nadu Agricultural University, Coimbatore, IN

Abstract

The virulence of Steinernema feltiae Filipjev to Spodoptera litura Fab. (Noctuidae: Lepidoptera) and Heliothis armigera Hbn. (Noduldae: Lepidoptera) was reduced as the temperature lnaeased from 24 to 30 °C. Between the two insects, H. armigera was more susceptible than S. litura. The LC₅₀ values for both the insects were higher at the final instar when compared to the third instar.

Keywords

Entomopathogenic nematode, Steinernema feltiae, Heliothis armigera, Spodoptera litura.

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T. Abdul Razak ¹, C. V. Sivakumar ¹

Affiliations
1 Department of Nematology, Tamil Nadu Agrl. University, Coimbatore-641 003, IN

Abstract

Multiplication rate of Steinernema feltiae Filipjev (DD-136 strain) on Corcyra cepbelonica (Staint.) larva was significantly influenced by the inoculum level with ten dauers per larva being the optimum for maximum multiplication. The relationship between the inoculum level and multiplication was curvilinear. The infectivity of the nematode to C. cephalonica was on a par at 25 and 30 °C, significantly less at 33°C and nil at 35 °C. Multiplication of the nematode was maximum at 25°C, signifincantly less at 30°C and absent at 33°C.

Keywords

Steinernema feltiae, Infectivity, Multiplication, Corcyra cephalonica.

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