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Russeting is a wound healing response associated with frost injury or with rain, high humidity, and fluctuations in temperature during early fruit development. Pesticide sprays, such as fixed copper, can also injure fruit when applied after quarter green leaf stage, particularly when temperatures are cool and drying conditions are slow. ‘Golden Delicious’ and ‘Hudson’s Golden Gem’ are susceptible to russeting.

Russet (Strang, UKY)
Russet.

(Photo: John Strang, University of Kentucky)

    

Management:

  • Cultivar selection
  • Four sprays of growth regulator (beginning at petal fall)

    

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