A Key to the Borers of Apple

Douglas G. Pfeiffer
Department of Entomology
Virginia Tech

The following is a key to borers in apple trees. Characters have been compiled from several sources (given below). Several morphological terms should be reviewed. Caterpillars have six true, jointed legs on the thoracic segements, immediately behind the head. The remaining, abdominal segments have various arrangements of prolegs (fleshy lobes used for grasping). These prolegs have small hooks, or crochets (VCSU image). These crochets may be arranged in a row of hooks of equal length (uniordinal), alternating long and short hooks (biordinal), or alternating long, medium and short hooks (triordinal). The crochets may represent a circle, oval, or one or two rows of transverse bands.

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