Abstract
Abstract A description is provided for Rhytisma Acerinum . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Many Acer spp., particularly A. pseudoplatanus in Europe and A. rubrum in North America. DISEASE: Causes tar spot of Acer spp. Stromata appear on living leaves during the summer, and the ascomata mature the following spring on the fragile decomposed fallen leaves. It apparently does not cause serious damage to the tree, but the black stromata are unsightly on ornamental trees. Many species of Acer are of horticultural importance. The disease can be controlled using copper and dithiocarbamate preparations (60, 2789), though burning of fallen leaves in autumn is simple and effective. In Italy, incidence of the disease is lower after a cold dry winter than a warm wet one (58, 5032). GEOGRAPHICAL DISTRIBUTION: Very widely distributed in north temperate regions. TRANSMISSION: Unknown: probably through ascospore dispersal into the air and direct infection of the leaves in humid weather.
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