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Raspberry > Fruit > Brown, dry, undeveloped berries

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  • Image: Fire Blight

    Credit: W. M. Ciesla, Forest Health Management International, Bugwood.org

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green arrowFire 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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  • Image: Spur Blight 1

    Credit: M. Grabowski, U of MN Extension

  • Image: Spur Blight 2

    Credit: M. Grabowski, U of MN Extension

  • Image: Spur Blight 3

    Credit: M. Grabowski, U of MN Extension

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green arrowSpur 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: Winter Injury

    Credit: M. Pritts, Cornell Univ.

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green arrowWinter Injury
Leptospaeria coniothyrium

  • Flowering is sparse. Flowers and fruit may form and fail to develop.
  • Leaves of mature canes wilt and die at the top of the cane only
  • New canes will be healthy
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green arrowPoor Pollination

  • Berries are small and crumbly

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