Elm (Ulmus)-Bark beetle


Elm bark beetle (Hylurgopinus rufipes)

European elm bark beetle (Scolytus multistriatus)

Pest description and damage Elm bark beetles are about 0.13 inch long and shiny brown or black. The larvae are white, legless, and about 0.16 inch long. Larvae and adults of both these species bore into the cambial and vascular tissues of trees, weakening them and causing wilting and dieback of individual stems and branches. Trunks and branches can be completely riddled with galleries. Beetles emerging from trees infected with Dutch elm disease infect the trees they attack next. Borers are primarily a problem on injured or stressed plants, but healthy trees growing adjacent to blocks of neglected trees also may be attacked. Scolytus schevyrewi was introduced to California in 2008, and may have extended its range into the PNW.

For biology, life history, monitoring and management

See "Bark Beetle" in:

Management-chemical control

See Table 4 in: