Apply fungicide at pink rebloom, petal fall and at two-week intervals through June or July. If powdery mildew is not controlled on highly susceptible varieties, there may be a poor bloom the following year. Blossom Period Fire blight. Petal Fall Powdery mildew on apples. Codling moth, powdery mildew, fire blight.
Moths usually start flying at bloom time.
Eggs laid by these moths begin to hatch about two weeks after petal fall, depending on the weather. Apply the first codling moth spray at this time to prevent larvae from entering the fruit. Because insecticide residues last 10 to 14 days and moths are continuously present throughout the summer, apply a spray every 10 to 14 days to prevent later broods of codling moth larvae from entering apple and pear fruits. Check the insecticide label to determine when to stop spraying before harvest to allow the pesticide residue to degrade. The wettable powder formulations are preferable where agitation of the spray mixture is possible.