The most common tree pathogens are Fungi. Like all types of life fungi need nourishment and they often obtain their energy supply from feeding on both hardwood and deciduous trees. Some types of fungus cannot be seen without a microscope while others can readily be seen in the form of mushrooms and conks.
Diseases Caused by Tree Pathogens.
1. Powdery Mildew Disease. This shows in the form of a white powder on the surface of the leaves of the tree, usually affecting trees like the Crabapple and Linden trees, but realistically the mildew can show on most trees or bushes. The fungus can be prevented by depriving it of moisture, and spraying affected areas with sulfur based fungicides.
2. Sooty Mold. This fungal disease commonly appears on Maple, Elm, and Box elder trees. The fungi are dark in color and feed on liquid substances which ooze out from the leaves of the tree. The disease does not cause direct damage to the tree but gives the tree an appearance of having been covered with soot. The fungi are easily washed away with water.
3. Verticillium Disease. This disease results from soil becoming contaminated by the Verticillium alboatrum pathogen and entry is gained via the tree roots. This causes the leaves to droop and develop a light color, ultimately the tree branches will die causing the death of the whole tree. There is no known cure for this type of disease.
4. Canker. Canker is a condition which affects the bark of the tree where localized areas on branches or on the tree trunk die off. There are a wide variety of fungi which cause tree canker. The diseases can be effectively controlled by cutting off affected branches, but if the trunk is affected the whole tree will be lost. There is no cure for this disease.
Diseases Caused by Tree Pathogens.
1. Powdery Mildew Disease. This shows in the form of a white powder on the surface of the leaves of the tree, usually affecting trees like the Crabapple and Linden trees, but realistically the mildew can show on most trees or bushes. The fungus can be prevented by depriving it of moisture, and spraying affected areas with sulfur based fungicides.
2. Sooty Mold. This fungal disease commonly appears on Maple, Elm, and Box elder trees. The fungi are dark in color and feed on liquid substances which ooze out from the leaves of the tree. The disease does not cause direct damage to the tree but gives the tree an appearance of having been covered with soot. The fungi are easily washed away with water.
3. Verticillium Disease. This disease results from soil becoming contaminated by the Verticillium alboatrum pathogen and entry is gained via the tree roots. This causes the leaves to droop and develop a light color, ultimately the tree branches will die causing the death of the whole tree. There is no known cure for this type of disease.
4. Canker. Canker is a condition which affects the bark of the tree where localized areas on branches or on the tree trunk die off. There are a wide variety of fungi which cause tree canker. The diseases can be effectively controlled by cutting off affected branches, but if the trunk is affected the whole tree will be lost. There is no cure for this disease.
No comments:
Post a Comment