De Chaunac is a French-American hybrid wine grape variety used to make red wines. It was developed by Albert Seibel circa 1860. It is also known as Seibel 9549 and is a cross of Seibel 5163 and possibly Seibel 793. The grape was named after Adhemar de Chaunac, a pioneer in the Ontario wine industry.De Chaunac is known to have a very vigorous growth habit and good resistance to powdery mildew and downy mildew.