The 2020 derecho left large amounts of downed corn as it swept across Iowa. Farmers faced the challenge of determining the best way to deal with this corn, which in some cases is being left in the field. Most of these fields will be planted to soybean in 2021, which brings up an interesting question – how will all the corn residue, including corn kernels, affect soybean diseases next season?
Dr. Yuba Kandel, researcher in the Department of Plant Pathology and Microbiology, Iowa State University, explains how glyphosate affects sudden death syndrome of soybean. Dr. Kandel summarizes research from Illinois, Indiana, Iowa, Michigan, Wisconsin and Ontario, Canada. Visit our website - https://www.ipm.iastate.edu
Daniel Sjarpe, a graduate student at Iowa State University, discusses his research involving SDS in soybeans.
Renan Kobayashi discusses his research on sudden death syndrome in soybeans and it's relationship with different kinds of cover crops. He reveals which cover crops were infected by the pathogen and could lead to inoculum build up in the soil.
Muhammad Mohsin Raza, a graduate research assistant at Iowa State University in the Plant Pathology and Microbiology department, discusses his research project in this video. Sudden death syndrome is one of the major yield-limiting diseases of soybean and has widely spread across soybean producing states in the U.S. Every year; farmers suffer substantial yield losses due to this disease. Because of the limited understanding of the impact of SDS on soybean yield, it makes it difficult for farmers to decide whether or not to apply management tactics.
Several soybean diseases have become noticeable after recent rainfall across the state.
The following diseases are currently showing up regularly across Iowa soybean fields, depending on your location in the state:
The percentage of soybean treated with a seed treatment has increased greatly in recent years. Over the past five growing season, the Robertson lab has evaluated the effect of commercial seed treatments on stand count, disease incidence and severity, and yield of soybean with funding provided by Iowa Soybean Association.
This year's early season rain has increased the risk of soybean disease in Iowa. We have seen cases of Septoria brown spot, bacterial blight, sudden death syndrome (SDS), and frogeye leaf spot so far this year.
