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Assessing Losses in Rice Due to Insects and Diseases in Bangladesh

Published online by Cambridge University Press:  03 October 2008

H. D. Catling ,
Shamsul Alam  and
S. A. Miah
H. D. Catling
Affiliation:
International Rice Research Institute, GPO Box 64, Dacca
Shamsul Alam
Affiliation:
Bangladesh Rice Research Institute, GPO Box 911, Dacca, Bangladesh
S. A. Miah
Affiliation:
Bangladesh Rice Research Institute, GPO Box 911, Dacca, Bangladesh
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Summary

A series of 17 crop-loss assessments was made under simulated farmers' field conditions in the three main rice cropping seasons of Bangladesh. The main insect pests were the rice stem borers (Tryporyza incertulas, Chilo polychrysa, Sesamia inferens) and in the monsoon rice gall midge (Pachydiplosis oryzae). Disease incidence was negligible. In the winter and early monsoon yield losses averaged 4 and 6% respectively, but economic benefit was only derived from insecticide application in the monsoon season, when there was an average yield loss of 16%. An economic threshold of 5–10% damaged tillers (‘deadhearts’ and ‘onion shoots’) was indicated for early attacks of stem borers and gall midge. Possible reasons are given for the usually low incidence of insect pests and diseases in Bangladesh rice.

Type
Research Article
Information
Experimental Agriculture , Volume 14 , Issue 3 , July 1978 , pp. 277 - 287
Copyright
Copyright © Cambridge University Press 1978

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References

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