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Sclerotinia collar rot (Sclerotinia sclerotiorum) on Tobacco (Nicotiana tabacum)


4 Images
5368541
Paul Bachi
University of Kentucky Research and Education Center

Collar rot first appears as small, dark green, water-soaked lesions at the base of stems. Clusters of infected transplants will appear and will have a yellow, wilted, and unthrifty appearance.

5368542
Paul Bachi
University of Kentucky Research and Education Center

Signs of the fungus are found normally at the base of plants or on debris in float trays and include a white, cottony mycelium (fungal mass), present if humidity is high, and irregularly shaped, black sclerotia. Sclerotia resemble seeds or rodent droppi

5368543
Paul Bachi
University of Kentucky Research and Education Center

Plants can be rotted in half by complete rotting of a portion of the lower stem.

5368544
Paul Bachi
University of Kentucky Research and Education Center

Lower stem of an infected plants which severely rotted.