Abstract
The European corn borer (ECB), Ostrinia nubilalis (Hubner), was found infesting the shoots of newly planted apple trees during the fall of 1980. A survey showed that 1.5% of all shoots, 4.8% of the central leader shoots, and 8.6% of the 5,500 trees examined from eight orchards were damaged by the larvae. The injury consists of a tunneling into the succulent portion of the current season's growth, causing either the death of the portion distal of the feeding site or predisposing the shoot to breakage at this point. Use of apple shoots by ECB larvae is attributed to unusually hot, dry summer weather in 1980 which adversely affected the number of preferred weed hosts. Loss of the terminal growth in central leader shoots is objectionable in young apple trees.
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