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

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Carrot > Leaves > Spots on leaves

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  • Image: Alternaria Leaf Blight 1
  • Image: Alternaria Leaf Blight 2

Alternaria leaf blight
Alternaria dauci

  • Leaflet margins and tips turn dark brown to black with a yellow halo
  • Lesions first evident on the lower, older leaflets
  • Many lesions growing together result in black, shriveled dead leaves
  • Large lesions can also develop on the petioles and may girdle and kill the leaves
  • Roots are not directly infected, but may be small due to severe leaf damage
  • More information on Alternaria Leaf Blight...
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  • Image: Bacterial Leaf Bight 1
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Bacterial leaf blight
Xanthomonas campestris pv. Carotae

  • Leaf spots start small, circular, light brown to tan
  • Eventually spots become elongate; dark brown with yellow edges
  • Infection progresses down the leaf
  • Severely infected leaves, yellow, wilt and die
  • Lower leaf surface is very shiny, and may be sticky in wet weather
  • Young leaves can become distorted
  • Roots are not directly infected, but may be small due to severe leaf damage
  • More information on Bacterial Leaf Bight...
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  • Image: Cercospora Leaf Blight 1
  • Image: Cercospora Leaf Blight 2
  • Image: Cercospora Leaf Blight 3

Cercospora leaf blight
Cercospora carotae

  • Leaves develop roughly circular purplish brown spots with a gray center
  • Leaf tissue around spots turns yellow, leaf margins may darken and curl upward
  • Many leaf spots can grow together resulting in leaf wilt and death
  • Lesions apparent throughout old and new leaves
  • Roots are not directly infected, but may be small due to severe leaf damage
  • More information on Cercospora Leaf Blight...

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