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PARASITISM OF THE ORIENTAL FRUIT MOTH, GRAPHOLITHA MOLESTA (LEPIDOPTERA: TORTRICIDAE), IN AN UNSPRAYED PEACH ORCHARD ON THE NIAGARA PENINSULA, ONTARIO

Published online by Cambridge University Press:  31 May 2012

J. H. H. Phillips  and
Jean R. Proctor
J. H. H. Phillips
Affiliation:
Research Station, Canada Department of Agriculture, Vineland Station, Ontario
Jean R. Proctor
Affiliation:
Statistical Research Service, Canada Department of Agriculture, Ottawa
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Abstract

Eight species of insects parasitic on the Oriental fruit moth, Grapholitha molesta (Busck), were reared from host larvae collected in a peach orchard that was unsprayed since 1962. Macrocentrus ancylivorus Rohwer was the dominant species and parasitized between 40 and 50% of first and second generation larvae from 1964 to 1966. Despite this the parasite did not appear to be a controlling factor in these years and population fluctuations of the fruit moth resulted from other causes. In 1967 parasitism rose sharply to 61% in the first generation and 74% in the second. Low adult emergence in the second generation was related directly to the increased parasitism. Effectiveness of the parasite depended both on its numbers and degree of synchronization with the development of the moth population. To determine its total effect parasitism must be measured throughout each generation of the fruit moth, because in most years it tended to reach a maximum early in the generation and then gradually decline.

Type
Research Article
Information
The Canadian Entomologist , Volume 102 , Issue 11 , November 1970 , pp. 1395 - 1404
Copyright
Copyright © Entomological Society of Canada 1970

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Footnotes

1

Contribution No. 165 of the Research Station.

2

Resigned 31 May 1967.

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