Anthracnose, Colletotrichum Leaf Spot -- Colletotrichum gloeosporioides, Collectotrichum spp.

January 1, 2004 - 01:00

Host: Many species of herbaceous plants, Euonymus spp.

Symptoms: Anthracnose is one of the most common plant fungi in tropical or temperate regions. Depending on the plant species, symptoms can appear as small, water-soaked speckles or large necrotic and chlorotic lesions that are circular to irregularly shaped. Lesions are yellow, tan, brown or black in color, often with a bright-yellow chlorotic halo. Infected leaves sometimes abscise. On some hosts, the spots can be angular in shape due to their confinement between leaf veins, while on other hosts a frog-eye spot can develop. Flowers may also be affected.

Conditions Favoring Disease: This disease may occur in areas with overhead irrigation and rainfall and where foliage does not dry rapidly. On some plants, Anthracnose occurs after heat or water stress.

How Pathogen Survives/Disperses: Spores are produced within an acervulus (a spore-producing structure). The fungus survives in spore structures within acervuli, in or on recently killed tissue. Spores are dispersed by water-splashing (i.e., irrigation, rain).

Photo and write up provided by Syngenta Professional Products

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