Major gene resistance exists for soybean mosaic virus. Sclerotinia stem rot Varieties differ in their susceptibility, but little is known about the genetic basis. Earlier maturity groups and varieties that do not lodge readily generallyU are less susceptible. Little is known about resistance to this disease. Make disease resistance a priority if a potentially reoccurring disease was a problem in 1992 or 1993.
Most diseases tend to reoccur due to pathogen buildup.
Resistance is most effective if used in combination with crop rotation and other management practices. Continuous planting of one resistant variety can lead to a breakdown in resistance to some diseases, so there is some risk to overuse of resistance. In the absence of disease, some resistant varieties may not yield quite as well as susceptible varieties, but the difference is usually small, especially when compared to the substantial yield benefit of resistant varieties in the presence of disease. This information subject to a usage policy .