Macrophomina phaseolina is a soilborne fungus that causes charcoal rot, which was in the past considered to be a "southern" soybean disease. Recently, charcoal rot has been observed in a number of fields in southern Ohio, where it can cause severe yield loss under dry, hot conditions. There are no resistant varieties, although there may be tolerance, and there are no reasonable recommendations for managing the disease in Ohio. Soybean cyst nematode (SCN) is one of the most important yield-reducing pathogens of soybean, and does much more damage under hot, dry conditions than under conditions where moisture is not limiting. In short, ample studies have been conducted to understand the one-to-one...