Fig. 1. Response of wheat lines and cultivars from the Unified Hessian fly Nursery to a Hessian fly population from southwestern Spain. T. aestivum cultivar Astral was used as the susceptible control. Each bar represents the average of a minimum 100 tillers/stock. Data are from 2 years for the Azuaga (1, Az) and Granjuela (2, Gj) locations.