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Wood decay fungus growing on rotting wood. Soft-rot fungi secrete cellulase from their hyphae, an enzyme that breaks down cellulose in wood. [4] This leads to the formation of microscopic cavities inside the wood and, sometimes, to a discoloration and cracking-pattern, similar to brown rot.
Rhytisma acerinum is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Tar spot does not usually have an adverse effect on the trees' long-term health. [1] R. acerinum is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite. [2]
Aleurodiscus oakesii is a cluster of small, gray-white, irregular cup-shaped saprotrophic fungi that grows on decaying hardwood tree bark. This fungus may also be called hophornbeam discs, [1] and it causes smooth patch disease. A. oakesii is found year round in North America, Europe, and Asia and is commonly found on oak trees.
An early sign is what looks like a bleeding spot on the tree. A reddish-brown fluid will ooze from the wound site, giving it this appearance. Later, perithecia will form around the dead spot, which is another sign of the disease. [1] [2] Symptoms of beech bark disease can be observed in the foliage and on the bole of the tree. Foliage may ...
Bisporella citrina, commonly known as yellow fairy cups or lemon discos, is a species of fungus in the family Helotiaceae. The fungus produces tiny yellow cups up to 3 mm ( 1 ⁄ 8 in) in diameter, often without stalks, that fruit in groups or dense clusters on decaying deciduous wood that has lost its bark.
What to do: Maybe that spot is too shady for grass. Or maybe you have an area that gets a ton of traffic, such as where you step off deck onto the lawn or along the fence line where your pet likes ...
Orange or yellow paints are used for harvest boundaries, and trees within those areas have blue, orange, green, or yellow paint, depending on whether they are to be taken or spared.
The symptoms begin with small (1/10-1/4”) reddish or purplish-brown spots with light green or yellow ring around them. As the disease progresses the damaged areas become slightly larger and then dry up and fall away, leaving BB-sized holes behind. As the fungus spreads, more leaf tissue is damaged until the leaf falls.