![]() In forest stands, maples often develop clear (50 to 70 percent of total height), well-formed stems with narrow crowns. Height growth becomes negligible after 50 to 70 years. Bigleaf maple is moderately long-lived some individuals may reach 300 years of age. Mature bigleaf maple trees range from 50 to 100 ft in height ( 160 ft maximum) and 12 to 36 in. It is the only western maple that reaches commercial size, yet its potential as a commercial species has not been fully recognized. Oregon State University, Forest Research Laboratory General Characteristicsīigleaf maple is second to red alder among native hardwood species in abundance and in commercial importance in the Pacific Northwest. This information was originally published in Hardwoods of the Pacific Northwest, S.S. Oregon Producers and Users of Bigleaf Maple.Another, hopefully, lesser possibility is bigleaf maple decline, Maple ( Acer spp.) - Bigleaf Maple Decline (Bigleaf Maple Dieback).Oregon maple, large-leaf maple, broadleaf maple ![]() ![]() Information can be found at Maple ( Acer spp.) - Leaf Spots. One is another fungal disease, leaf spot. More information can be found at: Maple ( Acer spp.) - Anthracnose.Īlthough this sounds like anthracnose, there are other diseases that might be affecting your maple. If you would like to use a chemical to help control anthracnose on your maple tree, Bonide Fung-onil Multi-purpose Fungicide is the one chemical that can be used in Oregon for home use. As mentioned about powdery mildew, fertilize your tree only when necessary. Maintaining the health of the tree can help to reduce stress of the disease and reduce the spread of the disease and the possibility of a secondary invasion of insects. And like powdery mildew be sure to leave as much room between trees to allow for airflow which creates an environment that does not allow fungi to thrive. The fungus will remain on those leaves throughout the winter and cause anthracnose to appear the following spring. To help control anthracnose rake up and destroy all fallen leaves. While this disease is usually not a threat to the health of a tree, if the disease becomes severe enough, the leaves will drop from the tree. Infected trees have leaves with dark, irregularly shaped lesions with dead areas between the veins and on leaf margins. It can spread by wind and splashing rainwater. This year, the cool, wet weather, has encouraged fungal growth. The anthracnose fungus overwinters in leaves that have fallen from trees and infected twigs and buds. Fertilizing it will cause the tree to produce shoots that are very susceptible to powdery mildew.įrom your description, your tree may be suffering from anthracnose, another common fungus disease in maple trees. ![]() Unless the maple tree has a nutrient deficiency, do not fertilize it. What can be done is to make sure that the tree has adequate spacing between it and other plants to allow for good ventilation. If you still suspect powdery mildew, control methods are usually not required because powdery mildew does not affect the heath of maple trees in any significant way. This link shows powdery mildew as it appears on maple leaves, Maple ( Acer spp.) - Powdery Mildew. ![]() Leaves with powdery mildew are not brown and falling off. From your description it does not sound like powdery mildew. Powdery mildew is a fungus that produces patches of a white powdery film with black spots, called fruiting bodies. Powdery mildew is one disease that is known to infect bigleaf maple trees. ![]()
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