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10/28/2013 - 11/3/2013

Hundreds of SCN-resistant Soybean Varieties Available for 2014

By Greg Tylka, Department of Plant Pathology and Microbiology

The soybean cyst nematode (SCN) is a serious yield-reducing pathogen of soybeans. It is present in many fields throughout the Midwest, wherever soybeans are grown.

To produce profitable soybean yields in fields infested with SCN, farmers should grow SCN-resistant soybean varieties. SCN-resistant soybeans can produce high yields while keeping SCN population densities from increasing.


Lots of choices

To help Iowa soybean farmers sort through the hundreds of SCN-resistant varieties from which to pick, Iowa State University annually compiles a list of the varieties in maturity groups 0, 1, 2 and 3.  The publication is financed by soybean checkoff funds through a grant from the Iowa Soybean Association.

The list of SCN-resistant soybean varieties has recently been updated and is now available for farmers making seed purchase decisions for 2014.  The list of SCN-resistant soybean varieties for 2014 is available in PDF format online at the Iowa Soybean Association Production Research website and from the Iowa State University Extension and Outreach Online Store

The updated list contains information on 673 varieties offered by 33 companies and two universities.  Most of the soybean varieties (all but 19) contain resistance from the PI88788 breeding line (also called the source of resistance).  A majority of the varieties are resistant to glyphosate.  Many of the varieties are LibertyLink® varieties, and several have no herbicide resistance.


Fewer varieties than in past years

There were 773 SCN-resistant soybean varieties in the 2012 publication, 100 more than in the recently updated list, from 41 different companies, eight more than in 2012.  The number of SCN-resistant soybean varieties available for Iowa farmers has continually decreased since 2010, primarily due to a decrease in the number of seed companies selling soybean seed in Iowa. 

The number of SCN-resistant varieties with the Peking source of resistance has stayed relatively the same since 2010; there are 14 varieties with Peking resistance in the updated list and five varieties with combinations of sources of resistance not including PI88788.

Figure 1. Number of SCN-resistant soybean varieties in maturity groups 0, 1, 2, and 3 available to Iowa soybean farmers from 1991 to 2013. The portion of each bar in red represents the number of SCN-resistant soybean varieties with a specified source of resistance other than PI88788.


Not all SCN-resistant varieties are created equal

Several genes provide resistance to SCN in soybeans for each of the sources of resistance (PI88788, Peking, etc.).  And not every soybean variety described as resistant to SCN necessarily possesses all of the resistance genes.  Therefore, SCN-resistant soybean varieties can vary greatly in the amount for nematode resistance they possess, as well as in their agronomic performance. 

Iowa State University annually evaluates SCN-resistant soybean varieties in experiments conducted at multiple locations throughout Iowa.  Each variety is studied in replicated plots to determine how well the variety yields and how well it controls the nematode pest in the soil.  The work is supported financially by a grant from the Iowa Soybean Association.  The results of the 2013 experiments will be finalized in December 2013 and made available at that time online at as well as in printed reports.


More information on SCN

Iowa State University’s management recommendations for SCN are online in a downloadable format, Soybean Cyst Nematode (SCN) Management Recommendations, IPM 63.  For more information about the biology and management of SCN, visit and


Greg Tylka is a professor with extension and research responsibilities in management of plant-parasitic nematode in the Department of Plant Pathology and Microbiology at Iowa State University. He can be reached at or 515-294-3021.

Integrated Crop Management Conference Set for Dec. 4-5

The Iowa State University Integrated Crop Management Conference will be held Dec. 4 and 5 on the Iowa State University (ISU) campus. Registration begins at 7:30 a.m. on Dec. 4 in the Scheman Continuing Education Building and the program concludes at 4:00 p.m. on Dec. 5.

Conference attendees can choose from more than 30 different workshops that offer the latest information on crop production and protection technology in Iowa and surrounding states. Workshops are offered by ISU faculty and staff and invited speakers from around the Midwest. The conference is hosted by ISU Extension and Outreach, the College of Agriculture and Life Sciences and the departments of Agricultural and Biosystems Engineering, Agronomy, Economics, Entomology and Plant Pathology and Microbiology.

A popular feature of the conference is the variety of guest speakers on the program. “Each year ISU specialists invite colleagues in their field to share their research activities with conference attendees. This provides an opportunity to hear expertise and opinions from across the region and country in one location,” said Alison Robertson, Extension plant pathologist and chair of the planning committee.

In addition to the traditional topics, this year’s program will also include several presentations focusing on topics of current interest: pest resistance to herbicides, fungicides and insecticides and sustainable biofuel production using perennial plants.

In recent years, the conference has filled to capacity with nearly 1,000 producers and agribusiness representatives in attendance. “The conference is fortunate to have a loyal following of people that attend each year. While filling to capacity is a good problem to have, we hate to turn people away. We encourage people to register early,” states Brent Pringnitz, conference coordinator for ISU Extension. Attendees can obtain Certified Crop Adviser credits as well as recertification for Commercial Pesticide Applicators in categories 1A, 1B, 1C, 4 and 10.

To register online or for more information, visit the conference website at Registration is $185. After Nov. 22, registration increases to $235. Enrollment is limited and no registrations will be accepted at the door. Be sure to register early to guarantee your spot at this event!


Alison Robertson is an Extension plant pathologist. she can be reached at (515) 294-6708 or e-mail Brent Pringnitz is a program services coordinator. He can be reached at (515) 294-6429 or

ISU Extension Offers Update Meetings for Ag Input Providers

Updates on the latest crop production products and recommendations are featured topics at meetings sponsored by Iowa State University Extension and Outreach in December. Update meetings will be Dec. 2 in Iowa City and Dec. 11 in Ames.

The meetings will give agriculture input providers an opportunity to meet with extension specialists from Iowa State and hear presentations on Pythium seedling disease, Palmer amaranth management, cover crops, soybean aphids and changes to nutrient management recommendations. Each meeting will feature presentations on weed, insect and crop disease management as well as soil, water and nutrient management.

Update meetings will be hosted by ISU Extension and Outreach field agronomists. Contact location hosts for additional information, or visit

Registration is $70 if received by midnight, Nov. 25 (Iowa City) or Dec. 5 (Ames). Registration after those dates is $85. Online registration and printable registration forms are available at


Continuing education

Both meetings are approved for Certified Crop Adviser (CCA) credits and recertification for Iowa Commercial Pesticide Applicators in categories 1A, 1B, 1C and 10. Recertification is included in meeting registration; attendance at the entire meeting is required for recertification.

This article was published originally on 11/4/2013 The information contained within the article may or may not be up to date depending on when you are accessing the information.

Links to this material are strongly encouraged. This article may be republished without further permission if it is published as written and includes credit to the author, Integrated Crop Management News and Iowa State University Extension. Prior permission from the author is required if this article is republished in any other manner.