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Showing posts from June, 2001

Soybean and corn diseases

Dean Reynolds, Extension Plant Pathologist
Soybean diseasesThe "dreaded" root rots

Figure 1. Fusarium root rot on soybeans. Finally, much of Minnesota is experiencing more than one warm, sunny day in a row. The soybeans, and other crops, were stuck in a slow growth mode for the last month due to the rainy, overcast conditions. But now the crops should start developing more rapidly. Fortunately, Pythium root rot is no longer a concern since it likes cool wet soils and preys on newly germinated soybean seeds and small seedling. However, Fusarium, Phytophthora, and Rhizoctonia root rots are still a threat to soybeans. The warm conditions contributing to the rapid growth of soybeans may actually result in more noticeable root rot symptoms. Now would be a good time to dig seedling in wet, poorly drained areas of fields to look for root lesions caused by the fungal pathogens. Lesions on roots that appear red, reddish brown, or brown are most likely caused by Fusarium or Phytophtho…