Mode of Penetration of Sycamore Leaves byGloeosporium platani

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Abstract
The chronology of the infection process of the sycamore anthracnose fungus on seedling sycamore leaves was investigated by using scanning and transmission electron microscopy. Under laboratory conditions, spore germination on the leaf surface exceeded 90% after 6 h of incubation. Growth on the surface was vigorous, of short duration and random. Almost without exception, termination of germ tube growth occurred within 5 h after inoculation and was characterized by development of prominent appressoria firmly attached to the leaf surface. Direct penetration of leaf surfaces by infection pegs emanating from appressoria was observed frequently.

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