BRANCH AND TWIG BORER

any member of either of two beetle families, Bostrichidae and Psoidae (insect order Coleoptera). The approximately 550 species of the family Bostrichidae are also known as false powder post-borers. They live in dry wood or under tree bark and range in size from 3 to 20 mm (0.1 to 0.8 inch); the palm borer (Dinapate wrighti) of western North America, however, is about 50 mm long. The apple twig, or grape cane, borer (Amphicerus bicaudatus) bores into living fruit-tree branches and grape vines but breeds in dead wood. The lead-cable borer, or short-circuit beetle (Scobicia declivis), bores into the lead covering of telephone cables. Moisture entering through the hole can cause short circuits. This beetle lives in oak, maple, or other trees and probably does not feed on the cable sheathing. The psoid branch and twig beetles (family Psoidae) differ from the bostrichids in having a large head visible from above. The adults are black or brown and range from 14 to 28 mm; the larvae bore through the heartwood. The spotted-limb borer (Psoa maculata) breeds only in dead wood, and the genus Polycaon is often destructive in orchards.