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