Diseases & Environmental Issues

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Apple Scab

Apple Scab is caused by a fungus that can be identified by black or brown lesions that appear on the leaves or fruits of the tree.

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Cedar Apple Rust

Cedar Apple Rust causes colored spots on the leaves in the spring. In the summer, the spots turn into cone-like structures.

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Diplodia Tip Blight

Diplodia Tip Blight kills the new tip of pine needles. Repeated years of dead tips can kill a tree.

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Dothistroma Needle Blight

Dothistroma causes pine needles to turn brown at the tips while remaining green at the base. The two sections are separated by a reddish-brown band.

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Dutch Elm Disease

Dutch Elm Disease is a colossally destructive disease to all North American species of elms.

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Fire Blight

Fire Blight is a highly contagious disease. The name refers to the blackened appearance of the leaves of a plant infected with Fire Blight.

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Oak Wilt

Oak Wilt is capable of rapidly killing an oak tree. Prevention and control of the spread are key when dealing with this disease.

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Rhizosphaera Needle Cast

Rhizosphaera affects spruce trees. The disease kills the older, inner needles first. The infected needles turn brown before falling off.

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Sycamore Anthracnose

Sycamore Anthracnose is a fungus disease that causes odd, unsightly growth patterns in the tree and an early loss of leaves.

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Chlorosis

Chlorosis is a micro-nutrient deficiency where the tree lacks iron or manganese.

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Girdling Roots

Girdling roots occur when the roots of a tree wrap around the base of the tree. This causes the flow of water and nutrients to be choked off from the rest of the tree.

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