There’s an old joke: What’s worse than finding a worm in your apple? Finding half a worm. For an apple-tree-owner, worse still is finding a worm – or worm holes – in every single fruit on your tree.

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The western cherry fruit fly can’t lay eggs in the fruit until the fruit begins to soften. A salmon-colored blush on the cherries is a reliable sign that the fruit is softening and needs protection to ...