Insect and Mite Pests
The raspberry cane borers, Oberea bimaculata (Olivier), are slender beetles, about 1/2 inch long, with antennae about as long as the body. The beetles are black except for a section behind the head that is bright orange with two or three black spots.
The adult red-necked cane borers, Agrilus ruticollis (Fabricius), can be identified by the reddish section (thorax) behind their head; the rest of the body is black.
Aphids are pear-shaped, tiny (1/16 to 3/8 inch long), soft-bodied, sucking insects with small heads and a pair of cornicles ("exhaust pipes"). At least three genera and eight species of aphids occur on raspberries in North America. Four species are found in the Northeast.
The 1/2-inch-long copper and green adult Japanese beetles, Popillia japonica (Newman), may appear in large numbers at harvest in late June to feed on the leaves.
Leaves infested by the two-spotted spider mite, Tetranychus urticae (Koch), first appear to have areas of white stippling. Later, the leaves may bronze, dry, and eventually fall off.
Plant bugs, especially the tarnished plant bug Lygus lineolaris (Palisot de Beauvois), but also including stink bugs and others, are generalist plant pests, feeding on a variety of crop and noncrop species.
Tree crickets deposit eggs in punctures in long rows in the canes of raspberries. Each puncture is distinct and more or less circular in outline, so the row of eggs appears as a series of dots, from a few to more than fifty.
Sap or picnic beetles are pests of fruit. The picnic beetle--the most frequent pest of raspberries--is about 1/4 inch long and has four orange spots on its back. Other species of sap beetles also are found occasionally in raspberries.