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THE EFFECT OF EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE), INFESTATIONS ON N, P, AND K CONCENTRATIONS IN APPLE FOLIAGE THROUGHOUT THE SEASON1

Published online by Cambridge University Press:  31 May 2012

H. J. Herbert  and
K. P. Butler
H. J. Herbert
Affiliation:
Research Station, Canada Department of Agriculture, Kentville, Nova Scotia
K. P. Butler
Affiliation:
Research Station, Canada Department of Agriculture, Kentville, Nova Scotia
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Abstract

Seasonal trends of the percentage of nitrogen, phosphorus, and potassium were measured in the foliage of apple trees infested with the European red mite, Panonychus ulmi (Koch), at four population levels created by the action of predators and/or chemical treatment.

It was shown that by early September the concentrations of these nutrients; particularly nitrogen, were significantly depressed by high P. ulmi populations.

Type
Articles
Information
The Canadian Entomologist , Volume 105 , Issue 2 , February 1973 , pp. 263 - 269
Copyright
Copyright © Entomological Society of Canada 1973

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