Radishes
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Foilage and Leave Problems
Holes from insect feeding
Cause
Flea Beetles.
Treatment
No treatment normally required.
Yellow or brown areas accompanied by white mold
Cause
Downy Mildew (Peronospora parasitica), a fungal disease that develops during cool most conditions.
Treatment
Avoid shaded plantings
Root Problems
Purple or black root
Cause
Black Root (Aphanomyces raphani), a fungal disease which causes the radish skin to turn purple or black in a single area. As the infection progresses, the entire root may be girdled.
Treatment
Avoid warm weather plantings, and storage conditions.
