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

Abstract

AbstractA 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.