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Charcoal rot of soybeans is most prevalent in the southern and western United States than in the north central region, and on early maturity to mid-maturity group soybeans. The disease is more severe under drought conditions when temperatures are high (28 to 35 °C [82 to 95 °F]). In a recent survey conducted in Ohio, M. phaseolina was detected in over 95% of the soybean fields sampled.
Soybean fields sampled in a survey during 2013 and 2014. Distribution of Macrophomina phaseolina in soybean fields.