Why are the Forests in Mariposa Brown?

In a word, they’re dead.

Why? Blame the bark beetle.

dendroctonus_ponderosae

Bark beetles are tiny. Often less than 4 mm in length, they’re almost impossible to see.

They reproduce in the inner bark of trees. Many species attack and kill live trees. Most often, bark beetles attack trees that are already weakened by disease, drought, smog, overcrowding, conspecific beetles, or physical damage.

Under outbreak conditions, like in Mariposa, the sheer number of bark beetles can overwhelm the tree’s defenses (sticky resin) and kill whole forests.

beetlemap_web

Read More:

Posted on November 28, 2016