They inhabit white, Lutz and Sitka spruce but only occasionally the black spruce. The beetles, just a quarter-inch long, can each lay up to 150 eggs in the phloem layer beneath a tree's bark on ...

Its bark is coarser and darker. However, the cones are better indicators. Black spruce cones are pudgy, rarely over an inch long and tend to cluster near the top of the tree. White spruce cones ...

Some species, like white ash, can have ridges ... Many pine and spruce trees have scales of bark, while species like the black birch have thick, irregular plates on their trunks.

While the trees are suffering due to the heat and the drought, the pests are proliferating rampantly in the warm weather: A pair of European spruce bark beetles, for example, can produce up to ...

For the first time, a research team led by Lund University in Sweden has mapped out exactly what happens when spruce bark beetles use their sense of smell to find trees and partners to reproduce with.

Bark beetle experts ... "But there is a lot of spruce beetles," she said. Spruce beetles are four to six millimetres long and turn from reddish brown to dark black as older adults.

Bark beetles may use receptors in their antennae to detect and feast on fungus-infected trees. The Eurasian spruce bark beetle (Ips typographus) – found in Europe, Asia and some parts of Africa ...