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SUMMER DIAPAUSE IN PHYLLONORYCTER BLANCARDELLA (FABR.) (LEPIDOPTERA: GRACILLARIIDAE) IN ONTARIO

Published online by Cambridge University Press:  31 May 2012

J.E. Laing ,
J.M. Heraty  and
J.E. Corrigan
J.E. Laing
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
J.M. Heraty
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
J.E. Corrigan
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

The life stages of Phyllonorycter blancardella (Fabr.) were monitored in an orchard at Guelph, Ontario in 1981 and 1982 and the results showed discrepancies with the previous concept of a trivoltine species occurring throughout its range in eastern North America. Sleeve cages were used to monitor the development of the second, mid-summer generation of leaf miners in a low-maintenance orchard at Guelph in 1982 and 1984 and 2 commercial orchards at Simcoe, Ontario in 1984. The flight period of the first-generation adults occurred over approximately a 6-week period. From eggs laid early in the flight period, a large proportion of the larvae developed quickly and emerged to give a second-generation adult flight. As the flight period continued, there was an increase in the number of progeny whose development was delayed in the early instars. These larvae did not pupate until late fall and overwintered as pupae. Of the second-generation larvae, about 70–90% at Guelph and 35% at Simcoe had a delayed development (summer diapause) and formed a large proportion of the overwintering population.

Résumé

On a surveillé le déroulement du cycle vital de Phyllonorycter blancardella (Fabr.) dans une pommeraie de Guelph en Ontario en 1981 et 1982, et les résultats ne concordent pas avec la notion que cette espèce est trivoltine sur toute son aire de répartition dans l’est de l’Amérique du Nord. On a utilisé des cages-manchons afin de surveiller le développement de la seconde génération mi-estivale de la mineuse dans un verger peu entretenu et 2 vergers commerciaux à Guelph en 1982 et 1984, et à Simcoe en 1984. La période de vol des adultes de la première génération couvrait environ 6 semaines. A partir des oeufs pondus au début de cette période, une proportion élevée des larves se sont développées rapidement et ont émergé pour produire un vol de seconde génération. A mesure que progressait le premier vol, on a observé une augmentation du nombre de progénitures dont le développement stagnait au premier stade. Ces larves ne se sont empupées qu’à l’automne pour hiverner au stade pupal. Quant aux larves de la seconde génération, environ 70–90% d’entre elles à Guelph, et 35% à Simcoe, ont subi un retard du développement (diapause estivale), et contribué largement à la population hivernante.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 1 , January 1986 , pp. 17 - 28
Copyright
Copyright © Entomological Society of Canada 1986

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