Conditions Favor Early Season Soybean Dieases (Jul 06, 2017)

Following are brief descriptions of some of the soybean diseases which may be injuring seedlings.

Pythium: Wet conditions are favorable for Pythium which is our most common seedling disease of soybean. Cooler soil temperatures will make this worse as the seedling will be stressed and grow more slowly. Typical symptoms of Pythium will include seed decay, pre-emergent seedling rot, and seedling damping off after emergence. 

Phytophthora: As soil conditions, warm up, Phytophthora often will become more common with heavy rains. Phytophthora is often indicated when a field was planted with a standard rate of seed treatment but still has significant stand reduction when wet conditions occur. Typical symptoms of Phytophthora are seed decay and pre-emergence seedling rot, and seeding damping off after emergence. 

Rhizoctoinia Root Rot and Fusarium Root Rot: A couple other diseases that have been observed this year are Rhizoctonia root rot and Fusarium root rot. Both of these are typically favored by dryer conditions and will occur more commonly in sandy or well-drained loamy soil types. Rhizoctonia will be evident as reddish brown lesions on the lower stem. Fusarium will have stunted plants with brown to black discoloration on the roots.

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