Charcoal Rot

Macrophominia phaseoli

charcoal rot damage on rootscharcoal rot stem damage

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The charcoal rot fungus attacks roots, stems and fruits. Stems develop basal cankers that girdle the stem, resulting in yellowing of foliage and eventual wilting and collapse of the entire plant. Initially the lesions are brown and may have amber colored droplets on them (resembling gummy stem blight), but they later become light tan in color and are dotted with small, spherical dark colored fruiting bodies (sclerotia). Fruit develop large sunken areas that are dark grey to black in color.

Disease development is favored by high temperatures and wet conditions. Crop rotations are ineffective because of the wide host range of the fungus. Maintaining plants in good nutritional condition is the best preventative measure.

See also The Texas Plant Disease Handbook.

The information given herein is for educational purposes only. Reference to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement by the Texas AgriLife Extension Service is implied.

Educational programs of the Texas AgriLife Extension Service are open to all people without regard to race, color, sex, disability, religion, age, or national origin.

Publication Revised July 2009

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