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Figure 1. Tunneling of apple fruit caused by larvae of the codling moth. Codling moth is the most important insect pest of apple and pears in North America. Damage is done by the larvae, which are cream-colored caterpillars that tunnel fruit and produce âwormyâ apples (Figure 1).
The holes left by the codling moth are covered with brown frass (droppings) and are sometimes hidden on the blossom end of the fruit. On walnuts, codling moth feed on kernels, causing premature drop or inedible nuts. Damage is usually more severe on late varieties, so consider growing early maturing apples and pears.