Conducive Weather for Soybean Diseases Provides a Good Opportunity for Variety Evaluation
Wed, Aug 27, 2014
Symptoms of early dying caused by white mold
Early dying of soybean plants in the pod filling stage is being reported by farmers and Extension specialists in several states. Early dying can be caused by white mold (Sclerotinia stem rot), brown stem rot, sudden death syndrome, and Phytophthora stem rot. All these situations are caused by different soybean pathogens, and all can be managed with host resistance.
At this point in the season, there is nothing to spray to control these diseases. But it's important to diagnose the situation correctly. Make note of the variety – the weather this season has been very conducive for soybean diseases, so it's a particularly good year to get data on how your varieties are performing under disease pressure.
There are also harvesting, tillage, and crop rotation strategies that will help reduce spread and the risk of occurrence next season. See these latest bulletins from state soybean pathologists: White mold (Sclerotina stem rot) is here
. Anne Dorrance, Ohio State University Destructive diseases of soybean – sudden death syndrome and white mold – observed in the state.
Carl Bradley, University of IllinoisBe on the Lookout for Brown Stem Rot in Soybean.
Daren Mueller, Iowa State UniversityDo you know your stem rots?
Anne Dorrance, Ohio State University
Soybean Producers Learn About Soybean Aphid Research at Regional Field Day
Fri, Aug 22, 2014
Over 50 participants attended a regional capstone event on an Iowa State University demonstration farm near Ames, Iowa. The event showcased soybean aphid research from a three-year NCSRP-funded research and extension grant.
The research showcased at this field day was a collaborative effort from university researchers at 11 different universities in the North Central region. Eighteen soybean aphid researchers were present to discuss their research and answer questions. Read the full article
Palmer Amaranth Work Making a Difference
Tue, Aug 12, 2014
A Muscatine County farmer’s determination to eradicate a relatively new yield-robbing weed in Iowa is inspiring others to do the same.
Roger Hargrafen discovered Palmer Amaranth — a tough herbicide resistant weed native to the southwest United States capable of decimating row crops — in a 5-acre section of a soybean field last September. Since then, he’s diligently worked to get rid of the weed and helped spread the word why that’s important and how to do it.
ISU weed and agronomy experts believe Hargrafen’s actions are making a difference. Steps taken include not harvesting the affected area, planting cover crops, intensive management such as scouting and hand weeding, participating in a herbicide trial and using herbicides with effective, multiple modes of action, thoroughly cleaning equipment and more. Read the full article