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Histological studies of damage by pod-sucking bugs (Heteroptera: Coreoidea) associated with cowpea Vigna unguiculata ssp. unguiculata in Nigeria

Published online by Cambridge University Press:  09 March 2007

O.L. Soyelu  and
A.E. Akingbohungbe
O.L. Soyelu*
Affiliation:
Department of Plant Science, Faculty of Agriculture, Obafemi Awolowo University, Ile-Ife, Nigeria
A.E. Akingbohungbe
Affiliation:
Department of Plant Science, Faculty of Agriculture, Obafemi Awolowo University, Ile-Ife, Nigeria
*
*Fax: +234 036 232401 E-mail: jlekan2001@yahoo.co.uk
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Abstract

Histological studies were conducted on cowpea pods fed upon by the coreoid pod-sucking bugs, Anoplocnemis curvipes (Fabricius), Clavigralla tomentosicollis Stå;l, C. shadabi Dolling, Riptortus dentipes (Fabricius) and Mirperus jaculus (Thunberg). Various degrees of tissue and cellular disruption were apparent, especially in the brachysclereids. They were manifested in terms of plasmolysis, cell enlargement and cell wall disintegration depending on the coreoid species involved. The feeding site and its periphery had all the cells of the brachysclereids plasmolysed, with the parenchyma having broken cell walls in the case of A. curvipes. Riptortus dentipes and M. jaculus showed similar patterns of feeding activity but less extensive levels of damage. The Clavigralla spp., however, caused cell enlargement in the brachysclereids, and broken cell walls in both the brachysclereids and the parenchyma. Damage symptoms were observed in cells far away from the feeding sites of the bugs, suggesting the possibility of sucrase activity which has been reported to cause osmotic pump feeding in the Coreidae.

Keywords

cowpeadamage symptomsCoreidaeAlydidaehistopathologyAnoplocnemis curvipesRiptortus dentipesMirperus jaculusClavigralla tomentosicollisClavigralla shadabi
Type
Short Communication
Information
Bulletin of Entomological Research , Volume 96 , Issue 4 , August 2006 , pp. 439 - 444
Copyright
Copyright © Cambridge University Press 2006

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