Figure 2.

Hyperparasite infectivity and infection severity varied among pathogen–hyperparasite genotype combinations. Hyperparasite strain 294_11 performed better than both other strains in terms of both the proportion of mildew lesions it infected, and the extent of infection after 16 days of growth. Mildew strains also vary in their susceptibility to hyperparasite attack, which is dependent upon the identity of the hyperparasite. For instance, mildew 33B is highly susceptible to 294_11 and 9066_3, but is able to resist 3210_3_2.