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Comparative growth and development of Riptortus dentipes and Nezara viridula on cowpea and soybean pods

Published online by Cambridge University Press:  19 September 2011

N. N. Ntonifor  and
L. E. N. Jackai
N. N. Ntonifor
Affiliation:
Plant Health Management Division, International Institute of Tropical Agriculture, PMB 5320, Oyo Road, Ibadan, Nigeria
L. E. N. Jackai*
Affiliation:
Plant Health Management Division, International Institute of Tropical Agriculture, PMB 5320, Oyo Road, Ibadan, Nigeria
*
*Corresponding author: IITA, c/o L. W. Lambourn & Co., Carolyn House, 20 Dingwall Road, Croydon CR9 3EE, England.
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Abstract

Studies were carried out on the neonatal development of Riptortus dentipes (Fabricius) and Nezara viridula (Linnaeus) on pods of cowpea Vigna unguiculata (L.) Walp (var. VITA-3) and soybean Glycine max (L.) Merrill (TG× 536–02D). Both crops sustained nymphal development and adult reproduction of R. dentipes. Nymphal duration was 20.7 days on cowpea and 21.3 days on soybean; mean adult weight was 56.3 mg (male) and 58.3 mg (female) on cowpea and 55.8 mg (male) and 57.6 mg (female) on soybean. Adults preferred soybean to cowpea for egg laying though a substantially higher number of eggs was laid on the mesh walls of the cages indicating the somewhat suboptimal nature of both plant substrates. The nymphal period for TV. viridula was 24.4 days on cowpea and 25.4 days on soybean, and the mean adult weight for males was 139.0 mg while that for females 186.0 mg on cowpea. On soybean, the mean adult weight was 127.3 mg for males and 176.9 mg for females. Soybean leaves were preferred for oviposition. The concept of host plant suitability to the various stages of these insects with respect to host switches between cowpea and soybean.

Résumé

Des études ont été conduites sur le développement néonatal de Riptortus dentipes (Fabricius) et de Nezara viridula (Linnaeus) sur les gousses du niébé, Vigna unguiculata (L.) Walp (variété VITA-3) et du soja, Glycine max (L.) Merrill (variété TG× 536–02D). Les deux cultures ont permis le développement nymphale ainsi que la reproduction adulte de R. dentipes. La duree du développement nymphale était de 20,7 jours sur le niébé et de 21,3 sur le soja. Le poids moyen de I'adulte était de 56,3 mg pour le mâle et de 58,3 pour l'adulte femelle chez le niébé; chez le soja, ces poids étaient respectivement de 55,8 mg pour le mâle et 57,6 pour les femelles. Les adultes preferaient le soja au niébé pour la ponte des oeufs, bien qu'un très grande nombre d'oeufs aient été pondus sur le grillage des cages, ce qui indique quand meme le caractère suboptimal de la nature des substrats des deux plantes. La durée du développement nymphale de N. viridula a été de 24,4 jours sur le niebe et de 25,4 sur le soja. Les poids moyen de l'adulte pour les mâles était de 139,0 mg tandis que pour les femelles, il était de 186,0 chez le niebe. Quant au soja, les poids moyen était respectivement de 139,0 mg pour les adultes mâles et de 176,9 pour les femelles. Les feuilles de soja étaient préférées pour l'oviposition. Le concept d'adéquation de la plante-hôte aux divers stades de développement de ces insectes passait du niébé au soja.

Keywords

cowpeadevelopmentgrowthNezara viridulaRiptortus dentipessoybeanniébédéveloppementcroissanceNezara viridulaRiptortus dentipessoja
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 15 , Issue 4-5 , October 1994 , pp. 453 - 459
Copyright
Copyright © ICIPE 1994

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