The soybean cyst nematode (SCN) is commonly considered to be the most damaging pest of soybeans. Unmanaged, this nematode can reduce soybean yields by 50% or more. Yield losses total many millions of dollars annually in Iowa. Despite being known in Iowa for nearly 30 years, many growers currently are unaware or unconcerned about the effects of SCN until serious damage occurs in their fields, often when very dry conditions occur during the growing season. Unfortunately, SCN management is most effective and profitable when it is initiated while population densities are low or moderate. In other words, the key to successful long-term SCN management is discovering infestations before population...