Growth inhibitory activity of Millettia pachycarpa (Bentham) extracts against Tobacco Caterpillar, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae)

Abstract

Millettia pachycarpa (Bentham), a perennial climbing tree, found endemic in north-east India used by tribes for treating various ailments. To ascertain the potential of M. pachycarpa for pest management, the present investigation was formulated against a polyphagous pest, Spodoptera litura (Fabricius). Growth inhibitory activity of various extracts and extract fractions was evaluated against third instar larvae of S. litura through topical as well as diet incorporation method. It was observed that dichloromethane extract showed very good growth inhibition in both topical (GI₅₀ 7.77 ppm) and diet incorporation methods (GI₅₀< 5 ppm). The growth inhibitory potential of this plant is also demonstrated by the presence of various abnormalities and reduction in larval and pupal weight.

Keywords:

• Biopesticides
• crop protection
• Millettia pachycarpa
• Spodoptera litura

Acknowledgement

The authors are thankful to Head, Division of Entomology and Head, Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, for providing necessary facilities. Financial assistance from Indian Council of Agricultural Research, New Delhi, is duly acknowledged.

Disclosure statement

No potential conflict of interest was reported by the authors.