My plums are swollen and enlarged. My raspberry plants have spots on the canes and don't produce fruit. Squirrels get them first. Hang traps by July 1.
Trapping is less effective than spraying.
Insecticide sprays help manage flies before they lay eggs. Do not spray before July 1. Do not pick apples sooner than the time indicated on the insecticide label. Maggots overwinter in cocoons in the ground. Controlling apple scab includes both cultural and chemical practices.