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

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Tomato > Fruit > Spots on fruit

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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...
2 of 9
  • Image: Anthracnose 1
  • Image: Anthracnose 2
  • Image: Anthracnose 3

Anthracnose
Colletotrichum coccodes

  • Infections are visible only on ripe and over ripe tomatoes
  • Fruit spots are sunken and round
  • Mature fruit spots have a black center
  • Fruit spots produce pink spores with moisture
  • No visible spots on leaves and stems
  • More information on Anthracnose...
3 of 9
  • Image: Blossom End Rot 1
  • Image: Blossom End Rot 2
  • Image: Blossom End Rot 3

Blossom End Rot
Abiotic

  • Affects only fruit
  • The bottom of the tomato turns tan and soft, then black, sunken, and rotten
  • Fruit may look short or stumpy, not fully expanded due to rot
  • Common when water levels vary from irrigation or drought followed by rain
  • More information on Blossom End Rot...
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  • Image: Alternaria Fruit Rot 1
  • Image: Alternaria Fruit Rot 2
  • Image: Alternaria Fruit Rot 3

Alternaria Fruit Rot
Alternaria alternata

  • Sunken round to irregular spot on fruit
  • Center of the spot is fuzzy and black
  • Spots occur anywhere on fruit, often on the sides or shoulders
  • Can occur on ripe or green fruit
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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...
6 of 9
  • 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...
8 of 9
  • Image: Sunscald 1
  • - CLICK PHOTO TO ENLARGE -

Sunscald
Abiotic

  • Affects fruit, young leaves and stems
  • Occurs only on tissue exposed to the sun
  • Fruit turns tan or white on exposed side, may dry out and appear wrinkled
  • Young leaves of transplants turn grey with irregular bands on the lower side
  • Young stems of transplants turn white on exposed side only
  • More information on Sunscald...
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  • Image: Virus 1
  • Image: Virus 2
  • Image: Virus 3

Virus
Cucumber mosaic virus, tomato mosaic virus, tomato
spotted wilt virus
and more

  • Leaves are mottled with yellow and light green patches
  • Leaves are misshapen; unusually long and thin like a shoestring or curled and deformed
  • Fruit have yellow blotches or brown rings
  • Plants are stunted even when neighboring plants look healthy and tall
  • More information on Virus...

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