Fri, Aug 26, 2016
by Brian Diers, Soybean Breeder, University of Illinois, and Thomas Baum, Soybean Nematologist, Iowa State University
Although SCN-resistant soybean varieties are available to minimize yield loss to soybean cyst nematode (SCN), over 90% of the varieties available to growers in the north-central United States have the soybean line PI 88788 as the genetic source of resistance. The effectiveness of PI 88788 resistance has decreased over time as nematodes have adapted to this type of resistance. Producers are faced with limited options for rotation once virulent SCN populations develop in their fields.
To provide farmers with effective and durable rotation schemes, we have identified seven genes from five soybean lines, including wild soybean (Glycine soja
), and are using them to develop lines with new combinations of SCN resistance genes.
Tue, July 26, 2016
by Patricio Grassini, Cropping System Extension Specialist, University of Nebraska, and Shawn Conley, Soybean and Wheat Extension Specialist, University of Wisconsin
From 2010-2014, the average soybean yield in the north-central region was 43 bushels/acre. Yet some producers can consistently attain soybean yields near or greater than 80 bushels/acre. In the first few months of a 3-year project, we have collected data from over 3,000 soybean fields in the region and are identifying key management factors that can be used by individual producers to increase soybean yield closer to the yield potential of their farms.
Mon, July 18, 2016
by Kelley Tilmon, Field Crop Entomologist, Ohio State University
Our interdisciplinary entomology and plant breeding team, comprised of 18 research and extension scientists in 12 states, has a long history of working together to solve insect problems of regional importance in soybean. This summer we are sampling for new and emerging pests such as stink bugs and thrips.
In our continuing work on soybean aphid, we have begun to backcross the aphid resistance genes Rag4 and Rag6 into the same MG group I and II backgrounds that we used to backcross Rag1, Rag2, and Rag3. The 2015 fall trap data predicted a small 2016 spring egg hatch and fewer aphids this summer.
Thu, June 23, 2016
By Brian Diers, Soybean Breeder, University of Illinois
Planting the most resistant varieties available is the foundation of an SDS management program. Our work on genetic resistance to SDS has made good progress towards the goal of providing growers with soybean varieties with increasing SDS resistance.
At least 17 varieties and germplasm lines have been released. Mapped and confirmed genes are now being integrated into breeding programs through the use of marker-assisted selection, which should continue to increase the pace of developing SDS-resistant varieties.
Mon, June 6, 2016
by Mehdi Kabbage and Damon Smith, Soybean Plant Pathologists, University of Wisconsin.
Sclerotinia stem rot (SSR), also called white mold, is a sporadic but yield-limiting disease in the north-central region. Specific weather conditions must be present at the time of soybean flowering -- if they are absent, then SSR is unlikely to occur. One of the objectives in our current work on Sclerotinia stem rot is to more clearly define the effect of weather and application timing on the efficacy of fungicides.
Mon, May 16, 2016
Kiersten Wise, Plant Pathologist, Purdue University and Loren Giesler, Plant Pathologist, University of Nebraska-Lincoln
In this video, we show how to recognize seedling diseases in the field, and how to collect a sample to confirm the field diagnosis. We have also updated the publication Fungicide Efficacy for Control of Soybean Seedling Disease
as of April 2016.