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K. Veenakumari ¹, R. J. Rabindra ¹, C. D. Srinivasa Naik ¹, M. R. Shubha ¹

Affiliations
1 Biological Control, Post Bag No. 2491, Bellary Road, Hebbal, Bangalore - 560024, Karnataka, IN

Abstract

Pot experiments carried out to study the efficacy of nucleopolyhedrovirus against the Bihar hairy caterpillar Spilarctia obliqua (Walker), at Bangalore indicated that a spray of NPV @ 1×10⁷ POB ml⁻¹ resulted in a larval mortality of 93.33% in third instar larvae and 87.5% in fourth instar larvae. Cent per cent larval mortality was obtained when the plants were sprayed with dichlorvos @ 2 ml l⁻¹. The leaf damage for viral treatments varied from 19.65 to 41.89 and 21.0 to 38.0 per cent for third and fourth instar larvae, respectively.

Keywords

Mulberry, SoNPV, Spilarctia obliqua.

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K. Veenakumari ¹, R. J. Rabindra ¹, C. D. Srinivasa Naik ¹, M. R. Shubha ¹

Affiliations
1 Project Directorate of Biological Control (ICAR), P. B. No. 2491, H. A. Farm Post, Bellary Road, Hebbal, Bangalore 560 024, Karnataka, IN

Abstract

Field experiments at Pavagada, Karnataka during August 2003, indicated that Amsacta albistriga NPV @ 1.5 x 10¹² POB/ha was as effective as chlorpyriphos @ 20g a. i./ha against red hairy caterpillar. For an environmentally friendly approach AaNPV can be used as an effective component of IPM packages for the control of red hairy caterpillars in the endemic areas of Karnataka.

Keywords

Amsacta albistriga, Nuclear Polyhedrosis Virus, Groundnut Ecosystem.

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K. Veenakumari ¹, R. J. Rabindra ¹, C. D. Srinivasa Naik ¹, M. R. Shubha ¹

Affiliations
1 Biological Control (ICAR), P. B. No. 2491, H. A, Farm Post, Bellary Road, Hebbal, Bangalore, 560 024, Karnataka, IN

Abstract

Five experiments were carried out in the laboratory to evaluate the effect of temperature, humidity, host plant, viral dosage and age of the larvae on the yield of the nucleopolyhedrovirus that could be produced in the red hairy caterpillar, Amsacta albistrigu (Walker). It was concluded that inoculating early sixth instar larvae with a virus inoculum of 5 x 10⁸ POBs/ml, fed with castor leaves, and incubated at 30 ± l°C with a relative humidity of 80–90 per cent gave maximum yield of AaNPV. This forms the basis for mass-producing the nucleopolyhedrovirus of the red hairy caterpillar in the laboratory, which could be used as one of the major components of IPM practices for controlling A. albistriga.

Keywords

Amsacta albistriga, Host Plants, Humidity, Laboratory Mass Production, Larval Age, Temperature.

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