New bulletins detail sugar beet, potato disease

Steven L. Miller
University of Wyoming Cooperative Extension Service

New sugar beet and two potato bulletins that detail diseases are available to producers. Gray Franc, Department of Plant Sciences in the College of Agriculture, has produced “Powdery Mildew of Sugar Beets, MP-115”; “Rhizoctonia Canker and Black Scurf of Potato, MP-116”; and “Silver Scurf of Potato, MP-117.”

Each contains detailed, color photographs that accompany descriptions of symptoms and signs, the causal organism, disease development and management approaches available to producers.

Powdery mildew is caused by a fungus that also infects Swiss chard and table beet. Rhizoctonia canker and black scurf, caused by the fungus Rhizoctonia solani, is one of the most common potato diseases. Silver scurf is a cosmetic disease of the tuber skin that affects tuber appearance and consumer acceptance.

The publications are available for free on the Internet at

Copies of “Powdery Mildew of Sugar Beets” can be obtained for $5 each, and copies of “Rhizoctonia Canker and Black Scurf of Potato and Silver Scurf of Potato” can be obtained for $10 each by e-mailing the College of Agriculture’s Resource Center at, calling the center at (307) 766-2115, or writing to the University of Wyoming, College of Agriculture, Dept. 3313, 1000 E. University Ave., Laramie, Wyo. 82071.