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The influence of green spider mite, Mononychellus tanajoa (Bondar) infestation on some biochemical components of cassava leaves

Published online by Cambridge University Press:  19 September 2011

T. O. Ezulike
Affiliation:
National Root Crops Research Institute, Umudike, P. M. B. 7006, Umuahia, Imo State, Nigeria
R. I. Egwuatu
Affiliation:
Department of Crop Science, University of Nigeria, Nsukka

Abstract

Cassava leaves damaged by green spider mite, Mononychellus tanajoa (Bondar) and undamaged leaves were analysed in the laboratory for chlorophyll content by spectrophotometry. Proximate analysis was also carried out on the leaves in the laboratory using the Association of Official Analytical Chemists methods.

More light was absorbed by the chlorophyll extract from the undamaged leaves than in the mite-damaged leaves. More light was also absorbed at the wavelength of 663 nm than at 645 nm. The concentrations of chlorophyll a and b were higher in the undamaged leaves than in the mite-damaged leaves. The concentration of chlorophyll a was higher than that of chlorophyll b both in the undamaged and mite-damaged leaves.

Mite-damaged leaves weighed less than the undamaged leaves, both when fresh and when dried. The proximate products values were less in the mite-damaged leaves than in the undamaged leaves.

Résumé

Les feuilles du manioc endommagées par la mite Mononychellus tanajoa (Bondar) et celles intactes furent analysées pour leur teneur en chlorophylle grâce à un photospectrometre. D'autres analyses furent faites sur les feuilles en se basant sur les methodes analytiques de l'association officielle des chemistes. Une quantité importante de lumière fut absorbée par l'extrait de la chlorophylle des feuilles endomagées par les mites par rapport à celles intactes. A la longuer d'ondes 663 nm la lumiere fut absorbée efficacement comparée à la longueur d'ondes 645 nm. La concentration de la chlorophylle a et b etaient plus elevée dans les deux cas. Les feuilles endommagées par les mites avaient un poids inferieur par rapport à celles intactes fraiches comme sèches. Les valeurs d'autres substances ètaient moindre chez les feuilles endommagées que celles intactes.

Type
Research Articles
Copyright
Copyright © ICIPE 1990

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