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Effect of Water-Stress on the Reproduction of European Red Mite Panonychus ulmi (Koch) on Young Apple Trees1

Published online by Cambridge University Press:  31 May 2012

H. B. Specht
H. B. Specht
Affiliation:
Research Station, Canada Department of Agriculture, Kentville, Nova Scotia
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Abstract

Water-stress in young apple trees potted in sandy soil caused a six-fold retardation in Panonychus ulmi (Koch) population growth during two generations in a greenhouse. A considerably smaller retardation effect on the population growth occurred on water-stress trees growing in a compost-sand soil mixture. The leaves from moist compost-sand soil trees contained nearly the same percentage of nitrogen as those from water-stress trees, thus it is believed the detrimental effect of water-stress is caused by the inability of the mites to secure sufficient food supplies for maximum reproduction and growth.

Type
Articles
Information
The Canadian Entomologist , Volume 97 , Issue 1 , January 1965 , pp. 82 - 85
Copyright
Copyright © Entomological Society of Canada 1965

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