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White powdery fungus growth on terminal shoots of pears is less evident than in apples. However pears are susceptible to fruit infection, which appears as black marks and russeting on young fruit (Fig. 1). Powdery mildew does not overwinter in pear buds, as it does on apple. Primary inoculum affecting pears originates from nearby apple orchards.
Figure 1. Pear fruit damaged by powdery mildew. (AAFC)
Avoid planting Anjou pears near susceptible apple cultivars. Bartlett and Flemish Beauty are more resistant to powdery mildew.
Fruit - Apply a fungicide registered for powdery mildew on pear at the pink stage to protect fruit from russeting. Additional sprays may be necessary under high disease pressure.
Updated July, 2018