The fruit is malformed, shrunken, or shriveled. Often the cherries are rotten and pulpy, with one side turning red before maturity. Holes may appear in the fruit. Tapered, yellow white, legless worms up to 1/4 inch long may be found in the cherries.
You can''t control the worms in the current year''s fruit. When adults are active, apply an insecticide labeled for this pest, following label directions. Prevent maggots from burrowing into the ground to pupate by spreading black plastic under the tree.