Research Article | Published: 01 March 2006

Laboratory and field efficacy of some Entomogenous Fungi on Craspedonta leayana (Latr.) (Coleoptera: Chrysomelidae), a major defoliator of Gmelina arborea in the Northeast India

Sudhir Singh, H. K. Barman, N. D. Barthakur and R. Sett

Indian Journal of Forestry | Volume: 29 | Issue: 1 | Page No. 35-37 | 2006
DOI: https://doi.org/10.54207/bsmps1000-2006-35394D | Cite this article

Abstract

Regular surveys for pathogens of Craspedonta leayana in and around Jorhat District of Assam were undertaken. Four important entomogenous fungi, viz. Aspergillus sp., Fusarium sp., Metarhizium anisopliae and Beauveria bassiana were isolated from the dead, fungus infected larvae, pupae and adults of C. leayana. The laboratory studies were carried out to see the pathogenicity of two entomopathogenic fungi, viz. Aspergillus sp. and Fusarium sp. on C. leayana. The pathogenicity studies showed differential percentage mortality with respect to different concentrations of spore suspensions. Another experiment was conducted to see the field efficacy of Aspergillus sp., Fusarium sp. and B. bassiana on C. leayana. All the fungal species were found significantly pathogenic to the V instar larvae. However, in both the laboratory as well as field conditions, Fusarium sp. at the concentration of 2x107spores/ml was found to cause the highest mortality.  Apart from fungal infected larvae many diseased pupae were also collected which did not produced any fungal filaments under humid conditions. Spraying crude maceration of these diseased pupae did not produce disease to healthy IV and V instar larvae, the prepupae or pupae.

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How to cite

Singh, S., Barman, H.K., Barthakur, N.D. and Sett, R., 2006. Laboratory and field efficacy of some Entomogenous Fungi on Craspedonta leayana (Latr.) (Coleoptera: Chrysomelidae), a major defoliator of Gmelina arborea in the Northeast India. Indian Journal of Forestry, 29(1), pp.35-37. https://doi.org/10.54207/bsmps1000-2006-35394D

Publication History

Manuscript Published on 01 March 2006

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