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Radish > Leaves > Leaves yellow and wilt

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  • Image: 1

    Credit: Kristen Callow, Ontario Ministry of Agriculture

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green arrowClub Root
Plasmodiophora brassicae

  • Roots are swollen into large spindle shaped tumor like galls
  • Leaves turn pale yellow, wilt during hot, sunny days, and recover at night
  • Young plants may die
  • Common in wet soils with a low pH (acidic)
  • More information on Club Root...
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  • Image: 1

    Credit: J. Hahn, University of Minnesota

  • Image: 2

    Credit: J. Hahn, University of Minnesota

  • Image: 3

    Credit: J. Hahn, University of Minnesota

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green arrowFlea Beetles
Phyllotreta spp.

  • Adult feeding on leaves creates shallow pits and small, irregular holes giving it a "shot hole" appearance
  • Plants may appear wilted and may be stunted
  • Adults are small (1/16-1/8 inch long), and vary in color; can jump
  • Present throughout the season, young plants more susceptible
  • More information on Flea Beetles...
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  • Image: 1

    Credit: Kristen Callow, Ontario Ministry of Agriculture

  • Image: 2

    Credit: Department of Entomology, University of Minnesota

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green arrowCabbage Maggot
Delia radicum

  • Maggots feed on roots, creating tunnels where they feed
  • Feeding may cause deformed roots
  • Plants may appear yellow and wilted
  • Maggot is legless and yellow-white in color
  • Present in early May – mid June
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  • Image: 1

    Credit: M. Grabowski, University of Minnesota

  • Image: 2

    Credit: M. A. Cubeta, NC State University

  • Image: 3

    Credit: M. Grabowski, University of Minnesota

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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: Colucci, North Carolina State University

  • Image: 2

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

  • Image: 3

    Credit: T. Zitter, Cornell University

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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: Whitney Cranshaw, Colorado State University, Bugwood.org

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green arrowCabbage Aphid, Green Peach Aphid, and Turnip Aphid
Brevicoryne brassicae, Myzus persicae, Lipaphis erysimi

  • When large numbers are present, leaves can become yellow
  • 1/16-1/8 inch long, softbodied and pear-shaped
  • Aphids are present throughout the growing season
  • More information on Aphids...

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