Frost damage to apple fruitlet can result in a ring of russeted tissue.
Fruit
Apple flowers killed by frost. Note the dead flower parts and the brown in the center of the flowers.
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Raspberry plants are very sensitive to spider mites. Damage will start at the base of the plant, turning the leaves brown and crispy.
When pruning out raspberry horntail, look for a white pith, which means you have cut out the larva.
When the cane continues growing after wilting from horntail, the larva has probably been parasitized (shown in right images).
Western cherry fruit fly lays eggs inside fruits that have started to soften.
Look for woolly apple aphid to start on old wounds and pruning cuts.
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