An invasive tiny purple insect that shelters in woolly masses at the base of hemlock needles. Their feeding reduces growth and can lead to premature needle drop, grayish-green foliage, thinned crowns, and eventual death of the tree.
A dark grey/brown insect that hatches from a "case" or "bag" that the caterpillar forms and suspends on branches. The smaller larvae injure plants by feeding on needles and leaves, while larger larvae can cause severe defoliation and even death. Most commonly found on evergreen trees.
A fungal disease that results in the curling of leaves, leaf spots, and early leaf drop. The fungi attach themselves to the leaves and are spread by water and wind. Anthracnose is usually found in shade trees.
A chronic disease that can lead to premature leaf browning, marginal necrosis, and defoliation. This disease is spread by leaf hoppers and treehopper insects. The tree will see a gradual decline until the disease eventually kills the tree.
A fungal disease that causes flagging of branches. This is where reddish-brown branches are found growing in the middle of normally green branches. The infection can kill a tree if it is found on multiple branches or on the trunk.