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Studies on the legume pod-borer, Maruca testulalis (Geyer)—VIII. Cowpea phenology and yield loss assessment: effect of loss of leaves, shoots, flowers and pods on cowpea yield in Western Kenya

Published online by Cambridge University Press:  19 September 2011

Joseph B. Suh  and
Charles O. Simbi
Joseph B. Suh
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P.O. Box 30, South Nyanza, Kenya
Charles O. Simbi
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P.O. Box 30, South Nyanza, Kenya
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Abstract

Preliminary studies were conducted using four varieties of potted cowpea (Ex-Luanda, Katuli 107. Vita 1, TVx66–2H) to determine plant response to injury to foliar and reproductive structures. Several levels of leaf loss were simulated at two plant growth stages; flowers were excised manually for 10. 15 and 20 consecutive days post-flowering; and pods were removed at several levels, 7–10 days after flowering. Similar tests were carried out during the short rains of Mbita Point Field Station (MPFS) and on a farmer's field at Kodiera, near Homa Bay, using two varieties—a local indeterminate dual purpose type (Ex-Luanda) and a determinate grain cultivar (TVu 1509). Defoliation significantly decreased plant weight and pod and grain production, but not branching and pod dimensions of potted plants. Flower and pod loss did not markedly lower plant weight, pod and seed production, and the effect on branching was negligible. The response of field plants was strongly influenced by crop variety and environment, notably agronomic practices and location. These results have implications for integrated pest management (IPM) which are explored in the context of increased grain legume production.

Keywords

Agro-ecosystemcowpeadefoliationdeterminateholisticindeterminateinfestationintegrated pest management (IPM)intermediatephenologysimulationthresholds (E.T., E.I.L.)yield loss assessment
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. 89 - 96
Copyright
Copyright © ICIPE 1983

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References

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