Soybean Cercospora diseases show up
Since the planting season, weather in Iowa has been cooler and wetter than normal with frequent rainfall. The unusual weather has resulted in the prevalence of foliar diseases. Several diseases have shown up earlier than usual this season. Two weeks ago, we reported that bacterial blight and brown spot were prevalent in Iowa soybean fields. In our early planted research plots, soybean sudden death syndrome started to show foliar symptoms in the second week of July, more than two weeks earlier than normal.