Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Radish > Spots on leaves
Radish > Leaves > Spots on leaves
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Downy mildew
Peronospora parasitica
- Angular yellow spots on leaves that eventually grow into tan papery areas with a yellow border
- Fuzzy white to gray fungal growth can be seen on the underside of the leaves
- Dark brown to black sunken area on the upper half of the radish root, center of root remains white
- Skin on the root may be rough, corky and cracked
- Common in cool wet weather
- More information on managing diseases in the home garden
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Black rot
Xanthomonas campestris
- Yellow V-shaped lesions develop on margin of leaves, the point of the v follows a vein towards the base of the leaf
- As infection continues, leaves wilt, turn yellow and eventually turn brown and die
- Black veins can be seen in infected leaves, petioles and stems
- Disease favored by hot, humid conditions
- More information on managing diseases in the home garden
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Black leaf spot/Gray leaf spot
Alternaria spp.
- Gray to black round leaf spots with concentric rings
- Leaf tissue becomes dry, brittle and often falls out, resulting in a 'shot hole' appearance
- Leaf spots often appear first on lower older leaves
- More information on managing diseases in the home garden
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White rust
Albugo candida
- Circular raised white spots on upper and lower surface of leaf
- Flower heads swollen distorted and eventually dry and brittle
- Common on plants with downy mildew
- More information on managing diseases in the home garden
