Abstract
SUMMARYBlossoms of Malus sylvestris cv. Golden Delicious trees on M. 7 root‐stocks, maintained under various N‐P‐K nutrient regimes in sand culture in the glasshouse, were inoculated with Erwinia amyhvora, the incitant of fire blight. Widest differences between nutrient treatments occurred when about ten E. amylovora cells were applied to each blossom. Trees with high N and high P contents had most infections. Trees with lower P content were less susceptible. Of trees with low P content, those with higher K appeared more susceptible.
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