Biological control of key pest of jute, Spilosoma obliqua Walker (Lepidoptera: Arctiidae) - A case study


Affiliations

  • ICAR- Central Research Institute for Jute and Allied Fibres, Kolkata, West Bengal, 700120, India
  • ICAR- National Bureau of Agricultural Insect Resources, Bangalore, Karnataka, 560024, India

Abstract

Surveys were conducted in intensive jute growing areas of West Bengal to collect information on natural enemies and other entomopathogens infecting jute hairy caterpillar Spilosoma obliqua (Lepidoptera: Arctiidae). The jute crop supports large number natural enemies of S. obliqua and entomopathogens. Among the braconid larval parasitoids, Meteorus spilosomae (Hymenoptera: Braconidae) and Protapantales obliquae (Hymenoptera: Braconidae) were the key mortality factors. The activity of these parasitoids was noticed from mid- May to mid-July during the cropping season. The parasitoid, P. obliquae is a gregarious, endoparasitoid specific to S. obliqua and parasitize to the extent of 38% up to third instar of larvae whereas M. spilosomae reported to cause up to 77% of parasitisation on S. obliqua under field condition. Bacillus thuringiensis and nuclear polyhedrosis virus were found be very effective with mortality of, 64 and 93% respectively. These parasitoids and pathogens can be used as potential bio-control agents against jute hairy caterpillar through conservation, augmentation and mass multiplication.


Keywords

Biocontrol, jute, natural enemies, Spilosoma obliqua

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