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

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Tomato > Leaves > Spots on leaves

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  • Image: Flea Beetles 1
  • Image: Flea Beetles 2
  • Image: Flea Beetles 3

Flea Beetles

  • Damage occurs during spring
  • Small BB-sized pits or holes are chewed into leaves
  • 1/16th inch beetles
  • Small black beetles can jump
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  • Image: Septoria Leaf Spot 1
  • Image: Septoria Leaf Spot 2
  • Image: Septoria Leaf Spot 3

Septoria Leaf Spot
Septoria lycopersici

  • Infects leaves, stems, petioles and sepals
  • Small leaf spots (less than 1/8 inch in diameter)
  • Spots have dark edge, with a tan or grey center
  • Black dots appear in center of spot 8 days after spot first appears
  • Most common with high humidity and temperatures 68° to 77° F
  • More information on Septoria Leaf Spot...
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  • Image: Early Blight 1
  • Image: Early Blight 2
  • Image: Early Blight 3

Early Blight
Alternaria solani

  • Infects leaves, stems and fruit
  • Black leathery spots on fruit start on stem end
  • Dark irregular leaf spots, often surrounded by yellow tissue
  • Sunken dark round stem lesion with concentric circles inside
  • Occurs in warm wet weather, common at the end of summer
  • More information on Early Blight...
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  • Image: Bacterial Speck 1
  • - CLICK PHOTO TO ENLARGE -

Bacterial Speck
Pseudomonas syringae pv. tomato

  • Leaves have small (2 mm) black spots surrounded by yellow or light green halo
  • Green and red fruit have small black spots (1 to 2 mm)
    *Best way to distinguish from bacterial spot
  • Occurs in cool wet weather 64° to 75° F
  • Difficult to see bacterial streaming
  • More information on Bacterial Speck...
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  • Image: Bacterial Spot 1
  • Image: Bacterial Spot 2
  • Image: Bacterial Spot 3

Bacterial Spot
Xanthomonas campestris pv. vesicatoria

  • Leaves have small (1 mm) black spots surrounded by yellow or light green halo
  • Green and red fruit have large corky black spots (4 to 5 mm)
    *Best way to distinguish from bacterial speck
  • Fruit spots may have a white greasy looking halo
  • Occurs in warm wet weather 75° to 86° F
  • Difficult to see bacterial streaming
  • More information on Bacterial Spot...
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  • Image: Late Blight 1
  • Image: Late Blight 2

Late Blight
Phytophthora infestans

  • Irregular water-soaked lesions on leaves, turn olive then brown
  • Leaves, stems and petioles turn brown and shrivel
  • Fruit spot is round olive colored, can cover whole fruit
  • Infected tissue is covered with white mycelia is wet weather
  • Disease spreads very rapidly in cool wet weather
  • More information on Late Blight...
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  • Image: 1
  • Image: 2
  • Image: 3

Verticillium Wilt
Verticillium albo-atrum, Verticillium dahlia

  • A yellow wedge shaped lesion on leaf often with a brown center
  • Leaves yellow and wilt, often one side only
  • Lower leaves wilt first, eventually whole plant wilts
  • In a lengthwise cut of the stem near the soil line, veins are tan, center is green
  • Common in cool temperatures 68° to 75° F
  • More information on Verticillium Wilt...

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