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Strawberries >Flower Bud/Flower > Completely black or brown flowers

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  • Image: Botrytis 1

    Credit: Scott Bauer, USDA ARS, Bugwood.org

  • Image: Botrytis 2

    Credit: T. McCamant, Northland Comm. College

  • Image: Yellow Nutsedge 2

    Credit: Strand Memorial Herbarium

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green arrowBotrytis
Botrytis cinerea

  • Fruit develops indistinct, soft, light brown spots that rapidly enlarge and have a mild rotten smell
  • Gray powdery spores form on infected fruit under moist conditions
  • Disease favored by wet conditions and temperatures between 41-86F
  • One or several flowers in a cluster may turn brown to black and dry out
  • Black discoloration may extend down into the flower stalk
  • More information on Botrytis...
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  • Image: Anthracnose 2

    Credit: PPS, Bugwood.org

  • Image: Anthracnose 3

    Credit: T. McCamant, Northland Comm. College

  • Image: Anthracnose 1

    Credit: T. McCamant, Northland Comm. College

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green arrowAnthracnose
Colletotrichum sp.

  • Fruit will develop distinct round sunken brown to black blotches with no smell
  • Wet pinkish orange sticky spores may form in the center of the fruit infection when wet
  • Fruit rot can occur on green or ripe fruit
  • Spots on leaves are small (<1/4"), round, sunken and gray-black, often resembling ink spots
  • Flower infection results in dried out and brown flowers and flower stalks
  • Occurs more frequently in very warm and humid weather (>80°F)
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  • Image: Leather Rot 1

    Credit: S. Wold-Burkness, U of MN

  • Image: Leather Rot 2

    Credit: T. McCamant, Northland Comm. College

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green arrowLeather Rot
Phytopthora cactorum

  • A section of the berry or the entire fruit may turn tan, purple or brown
  • Infected berries have a foul “chemical” odor and become tough, leathery
  • Berries with any amount of infection are very bitter tasting
  • Infects flowers, green fruit and ripe fruit
  • Commonly occurs in low areas or where free standing water is present
  • More information on Leather Rot...

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