Want to increase your soybean yields by five to eight more bushel per acre? Find out the Soybean Cyst Nematode (SCN) population density in your field and chose your 2011 soybean varieties accordingly.
University of Illinois nematologist Terry Niblack says there are several issues at hand. If you don’t test for SCN, you don’t know if you have the problem. “Too many farmers assume the variety they are planting is resistant,” she says. Another growing problem is not all sources of resistance are holding up in the field. A race test can help you determine what type of resistance will fight back and what might succumb.
John Soper, Pioneer Vice President of Soybean Research, estimates that 90% or more of the SCN varieties on the market today contain PI-88788 type of resistance. “We’ve been doing work in recent years, particularly in the early Group I, Group II and Group III [maturity ranges], with a different source of resistance called Peking that previously hasn’t been deployed much.”
Pioneer hopes this alternative source of resistance will help growers that are no longer experiencing adequate protection. “Going forward it’s pretty obvious that SCN will continue to be dynamic in terms of its race structure and we’re looking at additional sources of resistance for the future,” Soper says.
Hartwig—a variety also known as PI-437654 or CystX—provides another source of resistance that provides a broader scope of resistance than the other options. However, Soper says it’s been very difficult to get the multiple genes within Hartwig into a variety without sacrificing yield.
“It’s no longer whether you have SCN, you also need to know what type you have,” he says.
Greg Tylka, Iowa State University nematologist, says the fall prior to your soybean crop year is the best time to sample for SCN.
Listen to John Soper describe the work being done to find new soybean varieties: