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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Radish > Spots on leaves

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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 Downy Mildew...
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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 Black Rot...
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Black leaf spot/Gray leaf spot
Alternaria spp.

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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 White rust...

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