Pests and Diseases By Tree Type

This invasive Asian insect (Cydalima perspectalis) is a pest that causes severe damage to boxwoods.

White pine blister rust is a fungal disease that attacks all five-needle or white pines.

White barked birch and ornamental birch are susceptible to this beetle that disrupts water and nutrient flow to the tree.

Black pineleaf scale is a scale insect that impact Douglas fir and all other pine species.

Swiss needle cast is a foliage disease specific to the douglas fir tree caused by fungus.

The emerald ash borer is a destructive non-native wood boring pest that affects ash trees.

Apple scab is caused by fungus and is a serious fungal disease of the apple in Ontario infecting foliage, blossoms and fruits.

Oak wilt is a fungus that grows on the outer sapwood of oak trees, restricting water and nutrient flow through the tree.

Dutch elm disease is a high invasive fungal disease that has been in Ontario since 1946.

Black knot is a fungal disease that affects cherry and plum trees.

Sudden oak death is a tree disease caused by a water mould.