In established stands, plants killed during the winter from crown rot complex or Phytophthora root rot will not regrow at this time. Winter-kill induced by Sclerotinia crown and stem rot is still evident. Plants surviving the winter with Sclerotinia infections wilt, yellow, and die. Bacterial stem blight also may occur when frost injury is followed by wet weather. Early cases of spring black stem and leaf spot also can be found.
Plants infected with Sclerotinia crown and stem rot continue to die.
Due to infection by Pythium and Phytophthora, early seedings may exhibit damping-off symptoms in cool, wet soils. Lepto leaf spot can be active now, especially on plants that are regrowing after a late freeze. When frost injury is followed by wet weather, bacterial stem blight also may occur. Spring black stem and leaf spot can be found during wet weather periods. Plants infected with Sclerotinia crown and stem rot continue to die.