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Studies on rice stem-borers in Kenya with emphasis on Maliarpha separatella Rag.

Published online by Cambridge University Press:  19 September 2011

Dang Thanh Ho ,
J. J. Njokah  and
J. G. Kibuka
Dang Thanh Ho
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P.O. Box 30, Mbita, South Nyanza, Kenya
J. J. Njokah
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P.O. Box 30, Mbita, South Nyanza, Kenya
J. G. Kibuka
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P.O. Box 30, Mbita, South Nyanza, Kenya
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Abstract

Survey and experiments were conducted to investigate the distribution and bionomics of the rice stem-borers in Kenya. Stem-borers collected and identified included: Maliarpha separatella Rag., Diopsis thoracica West, Sesamia calamistis Hmps. and Chilo partellus Swin. Maliarpha separatella were most abundant and infested throughout the crop season, D. thoracica infested during vegetative phase. S. calamistis frequently occurred at the onset of flowering stage toward harvest. C. partellus occurred more frequently in upland than lowland rice and was at low population. Assessment of crop loss caused by M. separatella was carried out under field, caged condition. It was observed that the per cent of empty grains was affected by Maliarpha infestation. Calculated yield loss based on percentage empty grains and number of ‘whiteheads’ was higher than the actual differences between grain weight of uninvested and infested crops.

Keywords

Rice stem-borersyield loss assessmentChilo partellusDiopsis thoracicaMaliarpha separatellaSesamia calamistis
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 4 , Special Issue 1-2: Crop-Borers and Emerging Strategies for their Control , June 1983 , pp. 65 - 73
Copyright
Copyright © ICIPE 1983

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References

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