Found this could be too much water but could be this,
Part II. Infectious Diseases
Diseases Caused By Fungi and Oomycetes
Alternaria Diseases (Black Spot, Gray Leaf Spot, Pod Spot)
Anthracnose
Black Leg (Phoma Stem Canker)
Black Root
Clubroot
Downy Mildew
Botrytis Gray Mold
Light Leaf Spot
Phytophthora and Pythium Damping-off
Phytophthora Root Rot
Phytophthora Storage Rot
Powdery Mildew
Rhizoctonia Diseases (Damping-Off, Wirestem, Brown Girdling Root Rot, Crater Rot, Head Rot)
Ring Spot
Sclerotinia White Mold (Cabbage Drop, Stem Rot, Watery Soft Rot)