Iowa State University nematologist, Greg Tylka, has conducted studies that are revealing that cyst nematode (SCN) resistant soybean varieties are becoming less effective over time. He says this is an alarming trend, similar to other current trends in weeds that have developed resistance to herbicides. Tylka and co-authors of the research that reviewed 25 years of data from tens of thousands of four-row variety evaluation research plots, predict the numbers of cyst nematodes will continue to increase and soybean yields will continue to decrease if the current soybean breeding line (PI88788) is the only resistance farmers have to available for use. One solution, they say, is to develop soybean varieties with resistance genes from other breeding lines. “This is a serious situation,” Tylka says, “because SCN has infested almost 70 percent of Iowa’s fields.” For those interested in learning more about this resistance breakdown as well as insecticide resistant soybean aphids are invited to attend and all-day workshop at Iowa State’s Field Extension Education Lab in Boone on Thursday, Aug. 17. More information can be found with this story on our website.
___________________________________
www.aep.iastate.edu/feel/resistance
