The codling moth, Cydia pomonella (Linn.), is the most serious pest of apple and pear on a worldwide basis. If trees are not protected from this insect, studies have shown that more than 95% of the fruit may be damaged. In addition to apple and pear, the codling moth may attack quince, hawthorn, crabapple, cherry, and English walnut. The adult codling moths lay their eggs on or near developing fruit. These eggs hatch into small white caterpillars, which eat their way into the fruit and feed inside while it's developing. The caterpillars may be found inside the fruit at harvest time, but have usually eaten their way out to overwinter on the bark of the tree. They will then pupate and hatch into adult moths the following spring, ready to mate.
Symptoms: Codling moths at the caterpillar stage cause extensive tunnels through fruit, spoiling it. Damaged fruit may ripen prematurely and drop.
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