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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]
This mycelial layer may quickly spread to cover all of the leaves. The lower leaves are the most affected, but the mildew can appear on any above-ground part of the plant. As the disease progresses, the spots get larger and denser as large numbers of asexual spores are formed, and the mildew may spread up and down the length of the plant.
Leaf spots reduce the surface area available on leaves for photosynthesis and so can result in smaller growth and yield of plants. Weakened plants may produce lesser fruit. Virus caused leaf spots reduces chlorophyll in the leaves, resulting in less photosynthetic activity.
If you or a loved one is experiencing an allergic reaction after coming into contact with a poisonous plant, you can call Texas Poison Control at (800) 222-1222 to seek help. Show comments ...
Possessing an illegal plant in Texas is a Class B Parks and Wildlife Code misdemeanor punishable by a fine ranging from $200 to $2,000, a maximum 180-day prison sentence, or both.
Symptoms of infection include a downward curling of the leaves, leaf tip dieback, stunting, necrosis of growing leaf tips, sunken 'chicken pox-like' spots on leaves (often with a surrounding halo), stem death and yellowing. [7] Since these symptoms are so generic, extreme caution must be taken when introducing new plants to your greenhouse.
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The leaves turn golden yellow to red [4] in autumn (less reliably in warmer areas). In Texas, specimens do not color well if they have a heavy seed year. [5] The flowers appear with the leaves in mid spring; they are produced in corymbs of 5–15 together, each flower yellow-green, about 4–5 millimetres (3 ⁄ 16 – 3 ⁄ 16 in