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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Radish >Leaves yellow and wilt

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Radish > Leaves > Leaves yellow and wilt

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Club 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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Cabbage maggot
Delia radicum

  • Chewing and tunneling in roots is present
  • Feeding may cause deformed roots
  • Plants may appear yellow and wilted
  • Maggots may be present; they are carrot-shaped, legless, and cream colored
  • Present in early May – mid June
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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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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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Cabbage 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, soft-bodied and pear-shaped
  • Aphids are present throughout the growing season
  • More information on Aphids

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