Organic spray for apple trees
Organic controls for apple diseases are a bit easier to accomplish than organic controls for the insects plum curculio and apple maggot. Copper sulfate or lime sulfur may be used during the dormant season for disease control. During the growing season, sprayable sulfur can be effective. (If the apple varieties you are growing are susceptible to scab, you may not get good results at disease control with these products. Consider growing a scab-resistant variety instead.)
For insect control you can use dormant oil (but do not mix it with the lime sulfur or sulfur.) You can control aphids with insecticidal soap. For codling moths, use Bacillus thuringiensis (Bt), applying four times: at petal fall and two weeks later, then again in late July and late August. For apple maggots, you may be able to get effective control using red sticky traps (6-10 balls coated with Tangletrap per tree). Display the balls on the outer portion of the tree from July through mid-September.
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