The influence of rainfall deficits on the abundance of Helicoverpa (=Heliothis) armigera in Andhra Pradesh, India

Pimbert, M P and Srivastava, C P (1991) The influence of rainfall deficits on the abundance of Helicoverpa (=Heliothis) armigera in Andhra Pradesh, India. Biological Agriculture and Horticulture, 8 (2). pp. 153-176. ISSN 0144-8765

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Analysis of larval counts, light-trap data and weather patterns over a six year period shows that prolonged rainfall deficits promote the growth of Helicoverpa armigera populations in Andhra Pradesh, India. Drought stress resulting from rainfall shortages enhances the chemical cues involved in larval host selection behaviour and improves the nutritional quality of many wild and cultivated host plants on which this polyphagous pest reproduces. A more holistic analysis of the causes of H. armigera outbreaks should also include the effects of man induced drought that stem from the destabilisation of the water cycle in the drylands of India. Water conservation measures may need to be integrated in an overall plan of insect control on an area-wide basis.

Item Type: Article
Subjects: Others > Agriculture-Farming, Production, Technology, Economics
Others > Climate Change
Depositing User: Mr Charan Sai Ch
Date Deposited: 26 Oct 2011 06:11
Last Modified: 26 Oct 2011 06:13
Official URL:
Acknowledgement: We thank Mr. S.K. Pal and his pest surveillance team for the meticulous recordingofH. armigera larvae on ICRISAT's mandate crops. Special thanks are also due to Dr. C.S. Pawar, M/s. Deepak Jadav and N. Narayana for arranging the recording of light trap catches and to Mr. Masthan Reddy, Joint Director, A.P. Bureau of Economics and Statistics, Hyderabad, for providing the rainfall data. We are also thankful to Mr. Md. Khaja and Mr. Mohan Reddy for their help in summarising the larval data on ICRISAT's mandate crops and to Mr. B.V.R. Sastry and Ms. Shankari for typing our manuscript. We also thank Drs. D. McDonald, K.F. Nwanze and an anonymous reviewer for their constructive criticisms.
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