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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Raspberry > Completely black or brown flowers

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Raspberry > Flower > Completely black or brown flowers

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  • Image: Botrytis 1
  • Image: Botrytis 2
  • Image: Botrytis 3

Botrytis
Botrytis cinerea

  • Flowers are brown to black and dry out
  • Gray powdery spores cover part or all of the infected fruit under moist conditions
  • Infected fruit may remain attached as shriveled, dried, black “mummies”
  • Disease favored by wet conditions and temperatures between 41-86° F
  • Light brown oval lesions form on canes where the leaves attach, and faded brown concentric circles are often visible within the lesion
  • Pest common name is Gray Mold.
  • More information on Botrytis...
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  • Image: Spur Blight 1
  • Image: Spur Blight 2
  • Image: Spur Blight 3

Spur Blight
Didymella applanata

  • Leaf and flower buds shrivel and die, and young fruit may fail to develop
  • Brown wedge-shaped area on leaves
  • Chestnut brown to purple oval lesions on young green canes where the leaves attach
  • Brownish purple lesions enlarge into streaks and cover much of the cane
  • As diseased canes mature, the outer layer dries out and becomes silvery. Cracked, tiny black dots can be seen on the silvery epidermis
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  • Image: Fire Blight

Fire Blight
Erwinia amylovora

  • Developing berries become hard and dry
  • Tips of young canes wilt, become blackened, and curl over into a “shepherd’s crook”
  • Leaf veins and petioles turn black, and canes die from top down

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