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Cucumber > Fruit > Rotten fruit

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  • Image: Anthracnose 1
    Credit: M. Grabowski, University of Minnesota
  • Image: Anthracnose 2

    Credit: M. Grabowski, University of Minnesota

  • Image: Anthracnose 3

    Credit: M. Grabowski, University of Minnesota

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green arrowAnthracnose
Colletotrichum obriculare

  • Circular sunken dark spots on fruit, salmon colored spores form in the center when wet
  • Somewhat circular dry brown leaf spots form near veins
  • Center of leaf spot often falls out, leaves appear ‘shot hole’
  • Commonly appears mid to late season
  • Also commonly infects melons and pumpkin
  • More information on Anthracnose...
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  • Image: Scab 1
    Credit: M.A. Hansen, VPISU, Bugwood.org
  • Image: Scab 2

    Credit: Clemson University, Bugwood.org

  • Image: Scab 4

    Credit: M.A. Hansen, VPISU, Bugwood.org

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green arrowScab
Cladosporium cucumerinum

  • Cucumber, summer squash, zucchini, & pumpkin have sunken fruit spots are covered with greenish black velvety fungal growth
  • Winter squash have raised corky areas around fruit infections, internal rot varies depending on resistance of variety
  • Irregular gray leaf spot with a yellow halo
  • Center of leaf spot falls out, leaves look shot holed or ragged
  • Watermelon is very resistant
  • More information on Scab...
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  • Image: Choanephora Rot 1
    Credit: M. Grabowski, University of Minnesota
  • Image: Choanephora Rot 2

    Credit: M. Grabowski, University of Minnesota

  • Image: Choanephora Rot 3

    Credit: David B. Langston, University of Georgia, Bugwood.org

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green arrowChoanephora Rot
Choanephora cucurbitarum

  • Blossom end of squash is soft, rotted and covered in fluffy purplish black fungal growth
  • Flowers are covered with first white then purplish black fungal growth
  • Occurs after wet weather
  • Most common in squash
  • More information on Choanephora Rot...
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  • Image: Gummy Stem Blight and Black Rot 1
    Credit: Credit: D. Karasevicz, Cornell University
  • Image: Gummy Stem Blight and Black Rot 3

    Credit: Clemson University, Bugwood.org

  • Image: Gummy Stem Blight and Black Rot 4

    Clemson University, Bugwood.org

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green arrowGummy Stem Blight and Black Rot
Didymella bryoniae

  • Fruit rot initially looks water soaked and eventually turns completely black
  • Tiny black dots can be seen in fruit infections
  • Fruit infection often starts on the side of the fruit touching the soil
  • Fruit often collapse due to other rotting organisms
  • Leaf symptoms vary from browning at leaf edges and between veins to circular tan to brown spots
  • Yellow halos may occur around leaf spots and older spots are often dry and cracked
  • Tan lesion on stems, often with black spots and dark gummy exudate
  • More information on Gummy Stem Blight and Black Rot...
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  • Image: Phytophthora Blight 1
    Credit: P. Bachi, UKY, Bugwood.org
  • Image: Phytophthora Blight 2

    Credit: D. Langston, UGA, Bugwood.org

  • Image: Phytophthora Blight 3

    Credit: H. Schwartz, CSU, Bugwood.org

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green arrowPhytophthora Blight
Phytophthora capsici

  • Fruit develop soft, water-soaked lesions which expand to large sections of the fruit
  • Infected fruit are soft, easily punctured and often collapse
  • Infected fruit are covered with white fungal growth
  • Large irregular brown spots on leaves
  • Stem and leaf petiole lesions are light to dark brown, water soaked and irregular
  • The entire plant may collapse if root and crown rot occurs
  • More information on Phytophthora Blight...
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  • Image: White Mold 1
    Credit: W. Brown, CSU
  • Image: White Mold 2

    Credit: H. Schwartz, CSU, Bugwood.org

  • Image: White Mold 3

    Credit: H. Schwartz, CSU, Bugwood.org

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green arrowWhite Mold
Sclerotinia sclerotiorum

  • Fruit becomes rotted and watery
  • White cottony mold on squash
  • Small hard, black raisin like fungal structures embedded in cottony mold
  • Most common on pumpkin and some winter squash
  • More information on White Mold...

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