Abstract
The increase of nymphal populations of Lygus lineolaris (Palisot de Beauvois) on strawberries in Quebec was related to accumulated degree days (DD). Data from five fields were used to describe nymphal abundance by a model which was validated with data from four other fields. The data were obtained by beating 100 randomly selected flower clusters over a plastic container twice a week and counting the nymphs. DD were calculated from 1 April based on a lower threshold of development equal to 12.4°C and an upper threshold of development equal to 33°C. Lygus nymphs are predicted by the model to attain their maximal numbers when 173 DD are accumulated from 1 April.
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