One example of a parasitic fungus is Ceratocystis fagacearum, a fungus that causes the disease oak wilt, which quickly kills healthy oak trees. Fungi in the genera Alternaria and Cladosporium are also parasitic, taking up residence in wheat and other grain plants and causing blackpoint disease.Continue Reading
A parasite is an organism that lives on or in another organism, known as that parasite's host. The parasite gains nourishment from the host, but the host is either harmed by the parasite's presence or unaffected by it. There are parasitic plants, animals and fungi.
The parasitic fungus that causes oak wilt is spread from tree to tree via insects, which carry the fungal spores on their legs. Oak wilt is a serious problem in many forests and urban areas, since it spreads easily and almost always leads to defoliation and tree death within several years. Symptoms of oak wilt include the formation of large spore mats on the tree's trunk and rapid loss of discolored leaves.
Blackpoint disease can be caused by a number of parasitic fungal species. It causes black smudges to appear on the heads of wheat and other grains. Blackpoint disease occurs most often in fields that are overly moist and when levels of humidity are high.Learn more about Botany
Oak comes from oak trees. Oak trees are native to North America but are now found in most parts of the world, except extremely cold places. They grow in China, the Himalayas, most of Europe and in parts of South America.Full Answer >
Clematis leaves turn yellow due to: fungal diseases such as rust and clematis wilt; insects such as scales, whiteflies and aphids; and environmental stress. Looking for additional symptoms aids in identifying the exact problem.Full Answer >
To identify diseases in maple trees, examine the bark for cankers and lesions, check for signs of girdling roots and analyze the tree to see if verticillium wilt is present. The difficulty of the identification process depends on numerous factors, including the visibility of the symptoms.Full Answer >
Japanese maple trees are susceptible to diseases such as anthracnose, verticillium wilt, tar spot, leaf spot, leaf scorch and root rot. Some of these diseases are potentially deadly, while others are usually harmless and merely cosmetic.Full Answer >