Soybean Progress Slowed By Cool Weather

   Jill Scheidt, agronomy specialist with University of Missouri Extension, scouted fields south of Lockwood for the Sept. 13 crop scouting update.
   Soybeans ranged from beginning pod to seed development stage.
   Growth and maturity progress is being slowed by cooler than normal temperatures.
   Scheidt did not observe diseases this week, although, Sudden Death Syndrome (SDS) is still popping up in places.
   “SDS appears on upper leaves during the reproductive stages. The leaves turn yellow, and the veins remain green. High moisture during the vegetative stage and below normal temperatures during bloom favor the development of SDS,” said Scheidt.
   SDS usually occurs in the bottom and irrigated fields, but the wet year has made conditions ideal for the disease to infect many fields according to Scheidt.
   Sudden Death Syndrome (SDS) is a soil-borne fungus. Therefore foliar fungicides do not control the disease. Resistant varieties, seed treatments, crop rotation and controlling soybean cyst nematode are suggested control options.
   The later SDS symptoms show up, the less yield loss associated; average yield loss is five to 15 percent.
   Scheidt observed a few larger podworms, but very little feeding was noted where they were present.
   “Podworms were moving slow, so they are unlikely to do much damage, but late planted fields should still be scouted until October or the first frost,” said Scheidt. ∆
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