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A THERMAL SUMMATION MODEL FOR PREDICTING SEASONAL OCCURRENCE OF THE ALFALFA WEEVIL, HYPERA POSTICA (COLEOPTERA: CURCULIONIDAE), IN SOUTHERN ONTARIO1

Published online by Cambridge University Press:  31 May 2012

D. G. Harcourt
D. G. Harcourt
Affiliation:
Ottawa Research Station, Agriculture Canada, Ottawa K1A 0C6
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Abstract

A thermal summation model based on heat units above 9°C accurately predicted peak hatch of eggs, an event critical to management of the alfalfa weevil, Hypera postica (Gyll.), in southern Ontario. The model also gave accurate predictions for maximum numbers of the larval and pupal stages, as well as other significant events such as cocooning and adult emergence.

Résumé

Un modèle de sommation thermique basé sur le nombre d’unités thermiques dépassant 9°C a permis de prédire avec précision la période d’éclosion de pointe des œufs, facteur essentiel dans la lutte contre le charançon postiche de la luzerne, Hypera postica (Gyll.), dans le sud de l’Ontario. Le modèle a également prédi avec précision le nombre maximum de stades larvaire et pupal, ainsi que d’autres repères significatifs comme la formation du cocon et l’émergence des adultes.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 7 , July 1981 , pp. 601 - 605
Copyright
Copyright © Entomological Society of Canada 1981

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References

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