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Radish > Leaves > Spots on leaves

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  • Image: 1

    Credit: Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org

  • Image: 2

    Credit: Colucci, North Carolina State University

  • Image: 3

    Credit: T. Zitter, Cornell University

  • - CLICK PHOTOS TO ENLARGE -

green arrowDowny 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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  • Image: 1

    Credit: M. A. Cubeta, NC State University

  • Image: 2

    Credit: M. Grabowski, University of Minnesota

  • Image: 3

    Credit: M. Grabowski, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowBlack 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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  • Image: 1

    Credit: M. Grabowski, University of Minnesota

  • Image: 2

    Credit: M. Grabowski, University of Minnesota

  • Image: 3

    Credit: M. Grabowski, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowBlack Leaf Spot/Gray Leaf Spot
Alternaria spp.

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  • Image: 1

    Credit: T. Zitter, Cornell University

  • - CLICK PHOTO TO ENLARGE -

green arrowWhite 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

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