Diaporthe phaseolorum var. sojae is a plant pathogen infecting soybean and peanut. Diaporthe phaseolorum var. sojae is the perfect form of the causal pathogen of pod and stem blight of soybean. It is a fungal ascomycete that commonly infects seeds, pods, stems, and petioles. This pathogen is also found in its imperfect state, Phomopsis sojae. This is a common disease of most soybean growing regions in the United States. Losses result from losses in field stands, reductions in yield, and poor seed quality.