Peach twig borer feeds on succulent twigs and ripening fruit. It overwinters on the bark, so the oil will smother the tiny larvae.
Fruit
Pear bud swell
Pear psylla causes browning of pear foliage. It overwinters as eggs near buds.
Peach bud swell
Fire blight infections on bark will ooze bacteria in spring. Copper prevents the bacteria from multiplying.
Cherry bud swell
Fall cankerworm overwinters as eggs that can be suffocated by oil. The larvae can feed on fruit and leaves.
Brown mite is a cool-season mite that is uncommon. It overwinters as eggs on the tree.
Apricot bud swell
Blister mites overwinter in bud scales. Their feeding causes brown spots to form in the summer.
Apple budburst
Aphids overwinter as eggs in fruit trees.
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Cherry powdery mildew starts on the lowest leaves of the canopy. Look on the leaf undersides for the powdery mycelium.
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