Abstract
SUMMARYThe development of S. macularis from spore germination to sporulation is described.Two Fragaria species and thirty‐six varieties of cultivated strawberries were tested for foliar reaction to mildew infection. Both F. chiloensis (originally from Ecuador) and F. ovalis were extremely susceptible. In the cultivated varieties tested, leaves of Cambridge Favourite, Huxley and Late Pine were found to be the most resistant. There were no immune varieties.Tests with isolates of the fungus from different parts of the country gave no evidence for the existence of physiologic races.The effects of certain leaf‐surface fractions on conidial germination have been demonstrated and their significance discussed.Histological studies have shown that leaf resistance is correlated with the relative difficulty of penetration of the cuticle and epidermal wall by the fungus. Necrotic symptoms appearing in leaves of certain varieties of strawberries on infection had no bearing on host resistance.
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