Phomopsis stem canker of sunflower is a serious disease caused by Phomopsis helianthi (sexual stage = Diaporthe helianthi), it was first observed in Europe in the late 1970s followed by U.S. in 1980s.
Phomopsis stem canker of sunflower is a significant condition affecting sunflowers, caused by Phomopsis helianthi (in its sexual stage, Diaporthe helianthi), first observed in Europe in the late 1970s and later introduced to U.S. in the 1980s.