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

Spider veins, also known as telangiectasias or thread veins, resemble spider webs or tree branches. They occur when damage to blood vessels close to the skin's surface causes them to widen.

Texans can help prevent the spread of oak wilt by avoiding pruning or wounding oak trees from February through June.