Informatics Publishing Limited

R. J. Rabindra ¹, S. Ethiraju ¹, S. Jayaraj ²

Affiliations
1 Department of Entomology, Tamil Nadu G.D. Naidu Agricultural University, Coimbatore-641 003, IN
2 Department of Entomology, Tamil Nadu G.D. Naidu Agricultural University, Coimbatore - 641 003, IN

Abstract

Several attempts have been made to control the gram pod borer Heliothis armigera (Hbn.) on different crops with the nuclear polyhedrosis virus (NPV) in India (Jayaraj and Rabindra, 1989). On sunflower, two applications of NPV at 250 LE/ha could effectively control H. armigera (Rabindra et al., 1986). Recently, the NPV of H. armigera was formulated into wettable powders and dusts and found effective against H. armigera larvae in the laboratory (Ethiraju et al., 1988). This communication deals with a pot culture study on the efficacy of NPV formulations against H. armigera larvae on sunflower heads.

Keywords

NPV, Formulations, Heliothis armigera, Sunflower.

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R. J. Rabindra ¹, S. Ethiraju ¹, S. Jayaraj ¹

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

Abstract

The nuclear polyhedrosis virus of Spodoptera litura F. was formulated into wettable powders and dusts and their efficacy was tested against second instar larvae of S. litura in the laboratory. The results showed that wettable powder formulations were as effective as the unformulated virus. Wettable powder prepared with dedenol as the wetting and dispersing agent was better than dust formulations. When water was used instead of acetone in the preparation of the formulations particularly the dusts, the efficacy was increased. The WP formulation began to loose its virulence from the third month onwards of storage.

Keywords

Nuclear Polyhedrosis Virus, Formulations, Wettable Powder, Dusts, Spodoptera litura.

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