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Tetranychid Mites on Cassava in Sierra Leone

Published online by Cambridge University Press:  19 September 2011

B. D. James
B. D. James
Affiliation:
Department of Zoology, Fourah Bay College, University of Sierra Leone, Freetown, Sierra Leone
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Abstract

The green cassava mite, Mononychellus tanajoa (Bondar) and the red spider mite, Tetranychus urticae Koch infest all varieties of cassava in Sierra Leone. Both tetranychid species are widely distributed in the country and are causing severe damage to the crop mainly in the major cassava producing areas in the north-western regions. M. tanajoa caused chlorosis and 91° loss in photosynthetic area of the attacked leaves and defoliation of the plant either by acting alone or in concert with T. urticae. Late planted crop was particularly vulnerable to the infestation. M. tanajoa and T. urticae appeared to avoid severe interspecific competition on the plant by habitat stratification.

Résumé

La teigne du manioc Mononychellus tanajoa (Bondar) et al mite d'araignée rouge Tetranychus urticae Koch infestant toutes les varieties de manioc on Sierra Leone. Les deux especès de tetranychid sont largement distritrées dans le pays et endommagent gravement in récotte surtout dans le nord-coust-oò se trouve les régions productrices le plus importantes du manioc. M. tanajoa a provoqué la chlorose 90° de perte de la surface photosynthétique des feuilles attaquées, et al defoliation de la plante soit par une action unilatérale soit de concert avec T. urticae. Des semailles tardives étaient particulièrement vulnérables aux invasion. M. tanajoa et T. urticae semblent éviter une compétition interspécifique grave sur la plante en stratifiant l'habitant.

Keywords

CassavaMononychellus tanajoaTetranychus urticaehabitat stratificationbiological control
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 2 , April 1988 , pp. 243 - 247
Copyright
Copyright © ICIPE 1988

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References

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