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en.wikipedia.org/wiki/Mountain_pine_beetle

Mountain pine beetles can damage whole regions of forest. Mountain pine beetles affect pine trees by laying eggs under the bark. The beetles introduce blue stain fungus into the sapwood that prevents the tree from repelling and killing the attacking beetles with tree pitch flow. The fungus also blocks water and nutrient transport within the tree.

www.animalspot.net/mountain-pine-beetle.html

The Mountain Pine Beetle (also abbreviated as ‘MPB’) is an invasive species of arthropods native to parts of the North American continent that are infamous for attacking millions of pine trees in the local forests. Adequate measures have been taken for stopping the mountain pine beetle. However, these beetles do not bite humans and are harmless.

www.hunker.com/13406687/how-to-kill-a-pine-beetle-in-your-trees

Pine beetles are mainly found in forests in Western North America. They can, however, also be found all the way from Canada down to Mexico. Pine beetles won't hurt humans or animals, but they will destroy all of the trees in their path.

www.arborist-treecare.com/dead-pine-tree-beetles-borers.html

A Dead Pine Tree may be Harboring a Colony of Beetles and Borers. You see a rust or bronze colored dead pine tree on your property. The abundance of the needles indicates that it may have died quickly under the voracious teeth of beetles and borers.

www.gardenguides.com/info_8533277_eats-pine-trees.html

Infested pine trees are often stunted, but they usually do not die from infestations because the larvae do not feed on new needles. Southern pine beetles first infest dying or weakened pine trees and move to healthy trees when their populations increase. These beetles tunnel inside the wood of the tree, placing their eggs in S-shaped galleries.

en.wikipedia.org/wiki/Bark_beetle

Bark beetles reproduce in the inner bark (living and dead phloem and cambium tissues) of trees.Many species, such as the mountain pine beetle (Dendroctonus ponderosae) attack and kill live trees.Most, however, live in dead, weakened, or dying hosts. Bark beetles play an important role in forest ecology, for example, by creating complex early successional forests.

www.sustainablelumberco.com/.../the-biology-behind-blue-stain-in-beetle-kill-pine

The mountain pine beetle begins attacking most pine species on the lower 15 feet of the trunk. They need adequate food, found in large-diameter trees, for their population to build up. After the larger lodgepole pines are killed, beetles infest smaller and smaller trees, where phloem is thin and excessive drying occurs.

www.reference.com/science/animals-eat-beetles-9f88c10835cf9635

The panther chameleon, gecko and Gray's monitor are lizards that eat beetles. Bats and rats also eat beetles of all sizes. The aye-aye locates beetles and other insect prey by tapping on tree trunks to listen for echoes. It eats any beetle it finds, from the tiny featherwing beetle to the mighty Hercules beetle.

www.waldwissen.net/wald/tiere/insekten_wirbellose/wsl_borkenkaefer_gegenspiel...

The biology and the environmental needs of bark beetles are already well known. The knowledge about their antagonistic agents however is limited. The fact sheet describes in detail the natural enemies (antagonists) of the spruce bark beetles (Ips typographus und Ips amitinus) and other bark beetles in Central Europe. The enemies of bark beetles ...