Apple powdery mildew
Podosphaera leucotricha
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How to spot it
Apple powdery mildew is caused by the fungus Podosphaera leucotricha and appears as a white, powdery coating on young leaves, shoot tips, and flowers. Infected leaves curl in and grow stunted, shoot tips often dry out completely. Flowers remain small and grayish, many fall off before fruit set. The easiest way to detect infection is on newly emerging shoots in spring, where the white coating is most visible.
Prevention
Use powdery mildew-resistant apple varieties when planting new trees, this removes the substrate for the fungus from the start. Cut infected shoot tips in winter and throughout the season and dispose of them in household waste instead of compost. A airy, light-filled canopy structure through regular thinning cuts lets leaves dry faster and makes it harder for the fungus to spread. Avoid excessive nitrogen fertilization; moderately fertilized trees develop firmer, less susceptible leaf tissue.
Affected plants
These plants in our database are especially susceptible.
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