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POPULATION TRENDS AND BEHAVIOR OF THE PEAR RUST MITE, EPITRIMERUS PYRI (PROSTIGMATA: ERIOPHYOIDEA), ON PEARS IN NOVA SCOTIA1

Published online by Cambridge University Press:  31 May 2012

H. J. Herbert
H. J. Herbert
Affiliation:
Agriculture Canada, Research Station, Kentville, Nova Scotia B4N 1J5
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Abstract

The pear rust mite, Epitrimerus pyri (Nal.), overwinters in a semi-active state in old leaf scar crevices and under bud chips of the leaf clusters. It becomes active within the bud in mid-April, as soon as the weather warms, and passes through three generations in the growing season as indicated by distinct peak egg populations observed in May, June, and July. The first generation eggs are laid within the swelling bud. The mites feed on the ventral surface of the leaves causing bronzing and on the calyx end of the fruit resulting in russeting of the epidermal tissue. Deutogynes of the third generation begin to enter hibernation by mid-August. Occasionally population levels reach economic injury level resulting in the downgrading of fruit.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 8 , August 1979 , pp. 955 - 957
Copyright
Copyright © Entomological Society of Canada 1979

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