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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 1021-9730
Vol. 4, No. 3, 1996, pp. 373-382
Bioline Code: cs96078
Full paper language: English
Document type: Short Communication
Document available free of charge

African Crop Science Journal, Vol. 4, No. 3, 1996, pp. 373-382

 en Influence of time of insecticide application on control of insect pests of cowpea and grain yield of cowpea at Mtwapa, Coastal province of Kenya
Kyamanywa, S.


Grain yield of cowpea, the most important grain in the Coast
Province of Kenya, is very low mainly because of insect pests
attack. It is, however, not clear which growth development
stages at which pest attack occurs lead to significant
reduction in yields.  Consequently, it is  difficult to focus
control strategies on a particular growth stage.  A study was,
therefore, conducted to determine the critical stage of cowpea
growth at which insecticide application minimises grain yield
loss due to pests.  The results indicated that controlling
flowering and podding pests resulted in 15 fold increase in
cowpea grain yield.  It is concluded that control efforts
should be focused on flowering and podding pests.

Maruca testulalis, Megalurothrips sjostedti, Ootheca sp., Pod sucking bugs, Vigna unguiculata

Kyamanywa, S.


Le rendement de grain du niebe, qui est le plus important dans
la cote provinciale du Kenya, est surtout plus bas a cause de
pestes d'insectes. Cependant, il n'y a plus de precisions sur
l'etape de la croissance qui reduit sensiblement le rendement
du niebe en cas d'attaque.  Par consequent, il est difficile
de concentrer sur les strategies des controles sur une etape
de croissance particuliere.  Cependant, une etude a ete menee
pour determiner l'etape critique de la croissance du niebe a
laquelle l'application de l'insecticide minimise pois le
rendement des grains a cause de perte des pestes.  Les
resultates ont indique que le controle de croissance des
fleurs et de la cosse resultent en 15 fois l'augmentation dans
la production des grains du niebe.  Il a ete conclu que les
efforts des controles devrent etre concentres sur la
croissance de fleurs et de la cosse.

Mots Clés
Maruca testulalis, Megalurothrips sjostedti, Ootheca sp., sacs pour sucer de la cosse, Vigna unguiculata

© Copyright 1996 - African Crop Science Society

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