Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Raspberry > Completely black or brown flowers
Raspberry > Flower > Completely black or brown flowers
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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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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
- More information on Spur Blight
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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