It’s a white, hard, sticky sap, kind of like hard honey. That's the tree's defense, trying to push that insect out from ...

“Prevention is key to stopping the spread of oak wilt. Any new wound on an oak tree can be an entry point for infection ...

Aside from the browning of leaves, the beetles leave bubbles of sap and “s”-shaped winding patterns in trunks, which can make it hard to identify an outbreak from afar. The beetle attacks ...

Pitch tubes, or nodes of tree sap, which indicate the presence of southern pine beetles, on a pitch pine tree at the Wertheim National Wildlife Refuge in Shirley in 2014. The beetles can be seen ...

Oak wilt is one of the deadliest tree diseases in the United States, killing millions of trees across 76 Texas counties.

To help prevent tree loss caused by oak wilt disease, Minnesota homeowners and forest landowners should avoid pruning or wounding oak trees from now through early summer. Spring weather promotes ...