Tarnished plant bug dynamics in Quebec vineyards

In temperate regions mirids may be a pest of vineyards and risk-adverse growers use control measures. A model driven by degree-days was developed to predict nymphs of Lygus lineolaris in vinetards. The lower threshold temperature for development was set at 10 degrees C. The model indicated that monitoring for Lygus nymphs in vineyards should be initiated at 228 and 630 degree-days calculated from March 1 for the first and second generation. Maximum abundance occured at 327 and 806 degree-days for the first and second generations.