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Crop losses in cowpea due to the pod-sucking bugs Riptortus dentipes, Mirperus jaculus, Anoplocnemis curvipes and Nezara viridula

Published online by Cambridge University Press:  19 September 2011

Olufemi O. R. Pitan  and
J. A. Odebiyi
Olufemi O. R. Pitan
Affiliation:
National Horticultural Research Institute, P.M.B. 5432, Ibadan, Nigeria
J. A. Odebiyi
Affiliation:
Department of Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Nigeria
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Abstract

The effects of increasing population densities of the cowpea pod-sucking bugs (PSB) Riptortus dentipes, Mirperus jaculus, Anoplocnemis curvipes and Nezara viridula were studied in caged potted cowpea (Vigna unguiculata) plants with infestation levels from 0 (control) to 12 adult bugs per cage. Generally, there was an increase in damage to cowpea (measured as damage to pods and seeds) with increasing in insect density. There was also a highly significant correlation between the number of infesting adult bugs and damage to pods and seeds, and a significant negative correlation between bug numbers and cowpea yield. The results suggest that control measures should be initiated at: 4 bugs (fourth instar and above) per 10 plants for R. dentipes and M. jaculus; 2 bugs per 10 plants for A. curvipes and 6 bugs per 10 plants for N. viridula at podding stage.

Résumé

Les effets de l'augmentation des densités de population des punaises suceuses de gousses de niébé, Riptortus dentipes, Mirperus jaculus, Anoplocnemis curvipes et Nezara viridula ont été étudiés en utilisant des plants de niébé (Vigna unguiculata) en pots, mis en cage avec des niveaux d'infestations compris entre 0 (témoin) et 12 punaises adultes. En général, on constate une augmentation des dégâts (sur gousses et graines) avec l'augmentation des densités d'insectes. Nous avons également pu établir une corrélation hautement significative entre le nombre de punaises adultes et les dégâts sur gousses et graines, et une corrélation significativement négative entre le nombre de punaises et la production de niébé. Les résultats suggèrent que pendant la formation des gousses, les mesures de lutte devraient être initiées à 4 punaises pour 10 plantes pour R. dentipes et M. jaculus, à 2 punaises pour 10 plantes pour A. curvipes et à 6 punaises pour 10 plantes pour N. viridula.

Keywords

cowpeainsect damageRiptortus dentipesAnoplocnemis curvipesMirperus jaculusNezara viridulaniébédégâtsRiptortus dentipesMirperus jaculusAnoplocnemis curvipesNezara viridula
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 21 , Issue 3 , September 2001 , pp. 237 - 241
Copyright
Copyright © ICIPE 2001

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