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Occurrence of the red spider, Oligonychus coffeae (Nietner), on tea in north-east India in relation to pruning and defoliation.

Published online by Cambridge University Press:  10 July 2009

G. M. Das
G. M. Das
Affiliation:
Senior Entomologist, Tocklai Experimental Station, Cinnamara, Assam.
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Extract

The red spider, Oligonychus coffeae (Niet.), persists in all stages of its development on a few old leaves and ‘ janams ’ (small leaves at the base of the shoot) of tea bushes during the cold weather, and this persisting population is primarily responsible for the attack in the spring.

In pruning, a great many of the old leaves (including janams) are removed from bushes, and, concomitantly, the red spider. Pruned tea is, therefore, less attacked than unpruned tea or ‘ skiffed ’ tea (where just a little is cut off the tops of the shoots) in which comparatively more leaves are left on bushes.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 51 , Issue 3 , November 1960 , pp. 415 - 426
Copyright
Copyright © Cambridge University Press 1960

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