Pathogenicity of Three Entomopathogenic Fungi against Helicoverpa armigera
N. Revathi, G. Ravikumar, M. Kalaiselvi, D. Gomathi and C. Uma*
Department of Biochemistry, Karpagam University, Coimbatore - 641 021
- *Corresponding Author:
- C. Uma
Department of Biochemistry, Karpagam University
Coimbatore-641 021, India
Fax: 091-0422- 2611043
E-mail: [email protected]ail.com
Received date: October 29, 2011; Accepted date: November 22, 2011; Published date: December 01, 2011
Citation: Revathi N, Ravikumar G, Kalaiselvi M, Gomathi D, Uma C (2011) Pathogenicity of Three Entomopathogenic Fungi against Helicoverpa armigera. J Plant Pathol Microbiol 2:114. doi:10.4172/2157-7471.1000114
Copyright: © 2011 Revathi N, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The agricultural pests and pathogens known so far include 2,000 species of insects and 800 fungi. Among the insect pests Helicoverpa armigera, a lepidopteran insect causes more than 50% loss in yield of important crops such as cotton, pulses, vegetables and sunflower in India. In recent years, agricultural production of pulses repeatedly have suffered average yield loss of about 67% due to high levels of insecticide resistance in H.armigera. In the present study, Metarhizium anisopliae, Beauveria bassiana, and Nomuraea rileyi are used to control the insect pest. The mass production of cell wall was carried out by two stage fermentation for the production of various enzyme and its inhibitors. The M. anisopliae and B. bassiana isolates from fields showed greater than 70% mortality of H. arimgera in the bioassay the percentage mortality declined; there was a decrease in the enzyme activities of B. bassiana. N. rileyi isolates did not exhibit detectable chitinase levels even up to 120 h.