Verticillium Wilt is caused by a soil-born fungi that infects the vascular system of a tree. This clogs the flow and causes wilt of the leaves and eventually death of entire branches. Norway Maples are very susceptible to this vascular disease.

Hemlock Woolly Adelgid

If you have a Hemlock you probably have Wooly Adelgid. The white "woolly" fluffs on the needles is a sure sign of this tiny pest. They feed on the needles and small branches of the Hemlock and cause branch die-back.

Gypsy Moth

Borers

Emerald Ash Borer Peach Borer Bronze Birch Borer

Oak Wilt

Anthracnose

Bagworm

Black Knot

Soil Compaction

After construction, sever foot traffic, and other events that compacts the soil around the absorbing roots of a tree, the environment below ground is restrictive to proper growth. The soil will need to be aerated and treated to correct this.

Girdling Roots

Girdling roots is a condition in which the tree's roots strangle and restrict flow when it's roots wrap around the trunk. As the tree grows in diameter the roots get tighter and tighter. Often a tree develops girdling roots as a young transplant. Container grown, or improperly planted trees are very susceptible to girdling roots.

Drought

Droughts are hard on all living things, and trees are large plants that require a lot of water. If the tree has shallow roots the drought will stress it quickly and the leaves will show it by wilting. To encourage deep roots you can water the tree with deep, long slow, soaking rather than quick spritzing of the soil which only moistens the top few inches. The roots reach for the water and if that is at the surface then all of the roots will be where it dries up the fastest.

Mechanical Injury

Any physical injury or damage. Lawn mowers and string trimmers are often the cause of mechanical injury.

A tree planted too low or too high can create a serious long lasting stress that allows other agents to attack and kill the tree.

Storm Damage

Extremes in temperature, Branch breakage, frost cracks, lightning strikes, etc.