Emerald Ash Borer

The Emerald Ash Borer (EAB) is an invasive pest introduced from Asia that attacks ash trees. This metallic wood boring beetle was found in Detroit, Michigan and Ontario, Canada in 2002, and has continued to spread into neighboring states and eventually across the U.S. and Canada. The adult is a small, metallic green beetle only […]

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Fire blight

Fire blight is the most damaging bacterial disease that affects shrubs and trees in the Rosaceous family during warm spring weather combined with rains or heavy dews. This disease is most often found in pear, apple, loquat and crabapple trees and has become a nuisance to homeowners and commercial landscape managers. Flower infections can be […]

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Iron Chlorosis

Iron or manganese chlorosis (interveinal chlorosis) describes a condition in which a tree’s foliage loses its healthy green color and fades to a pale green or yellow hue. This condition, if allowed to progress, will cause slow growth, leaf loss, and eventually tree death. Chlorosis is often caused by deficiencies of the micro-elements iron and […]

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Apple Scab

Apple scab is a fungal disease caused by the fungus Venturia inaequalis, which affects leaves, fruit and twigs. While most common in apple trees, both pear and hawthorn are also frequently infected by the fungus. Outbreaks will be most severe following particularly wet and cool spring conditions. The fungus overwinters on fallen leaves and begins […]

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Dutch Elm Disease

Dutch Elm Disease is a vascular wilt disease that causes rapid decline in as few as 6 weeks after infection.   American and European elms are commonly infected in two ways: via elm bark beetles that vector the disease from infected to healthy trees, or via fungi that are transmitted through root grafts. Dutch Elm […]

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Anthracnose

Anthracnose (leaf blight) is a fungus that winters on twig tissue on the tree. In the spring, spores are transported to new buds and shoots.  The disease is enhanced by cool, wet conditions.  Infected leaves develop tan to reddish brown lesions that extend along the veins of the leaf.  Considerable defoliation, sometimes with complete leaf […]

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Root Rot

Phytophthora is a genus of oomycetes that are similar to fungi.  There are 59 species of Phytophthora, all of which cause disease in plants.   Phytophthora ramorum is the species responsible for Sudden Oak Death. Phytophthora are natural and universally occurring soil organisms which attack roots in poorly drained or anaerobic soils.  As infected roots […]

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Oak Wilt

Oak Wilt is a disease caused by the fungus Ceratocystis fagacearum that is specific to oaks (Quercus spp.). The fungus is spread through root grafts between neighboring trees and by insects. Red Oaks are particularly susceptible to oak wilt. The infection causes leaf discoloration, defoliation and death in a very short period of time (from […]

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