What are the white spots on blueberries (the fruit itself, not the leaves)?
The Gardener’s Answer
Hello, Peggy: Without seeing your berries I cannot say for certain what the white spots are. This is not usually a symptom of blueberries. On the foliage yes, but not the actual fruit. Powdery mildew is common with blueberries but affects the foliage. What does the rest of the plant look like? Is the foliage healthy? Are the white spots possibly under-ripe portions of the fruit from the way the berries were hanging in clusters and the inner parts did not receive the same amount of light? Bloom scar found on the bottom of the berry can sometimes be white but the rest of the berry would not be spotty. Mummified berries that are attacked by a fungus will turn white and if left hanging will shrivel and drop. These are all just possibilities but for a positive diagnosis you can take a sample to your County Cooperative Extension Service for your horticulture agent to analyze. You may have disease problems in Washington state that as a Kentucky gardener I am not aware of.