Summary: Soybean varieties that are resistant to the soybean cyst nematode (SCN), Heterodera glycines, allow farmers to produce the crop profitably in fields infested with the nematode. SCN-resistant soybean varieties allow less nematode reproduction than what occurs on non-resistant (susceptible) varieties. Most (>95%) SCN-resistant soybean varieties have SCN resistance from the soybean breeding line called PI 88788, and the continued use of soybean varieties with such a narrow genetic base of SCN resistance has resulted in selection of SCN populations with increased reproduction on resistant varieties in fields. This presentation discusses the role and nature of SCN-resistant soybean varieties and the effects of elevated SCN reproduction on the yield of SCN-resistant soybeans.
United Soybean Board (USB) farmer-leaders develop and maintain partnerships with U.S. land grant universities and U.S. ag-focused research organizations such as the Plant Management Network to increase the transfer of checkoff-funded applied and practical production research information to U.S. soybean farmers. USB neither recommends nor discourages the implementation of any advice contained herein, and is not liable for the use or misuse of the information provided.