Sprinkler rot is a fruit rot that occurs most commonly on pears and less commonly on apples.
All commonly grown pear varieties are susceptible to the disease. On apples the disease is most frequently observed on Golden Delicious. Most Washington irrigation water is contaminated with the fungus that causes sprinkler rot. The disease is most severe in orchards with overtree irrigation, but can occur in orchards with undertree sprinklers if the angle of the sprinklers is sufficiently high to wet the fruit. Sprinkler rot sometimes occurs after trees are sprayed using contaminated water, especially under slow drying conditions.