Single gene resistance to Gibberella has been reported, but is not yet available. Hybrids vary in their susceptibility to Fusarium , Gibberella , and Diplodia . Check with your seed company representative for less susceptible hybrids if you have had severe ear rots. Little is known about resistance to seedling blights, but hybrids with more vigorous early growth may escape damping off to some extent. Both polygenic and major gene resistance are available.
Most seed companies offer varieties with good levels of resistance.
Phytophthora root rot of soybeans Both polygenic and major gene resistance are available. Most seed companies offer Phytophthora-resistant varieties. There are three or more sources of major gene resistance. There are several races of SCN, but any of the three sources of resistance is effective against the Iowa populations. Sclerotinia stem rot Resistance is polygenic, and there are some varieties with good white mold resistance.