Stem canker

Soybean stem canker is caused by a soilborne fungus called Diaporthe phaseolorum.The prevalence of stem canker depends on the amount of rainfall received during the early stages of soybean growth. The fungus produces many tiny spores on soybean debris, and the spores are carried by splashing rain to healthy soybeans.Plants with stem canker are often first noticed in field areas where the crop stand is thin.