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Horticultural crops :: Flowers :: Rose

Black spot: Diplocarbon rosae
Symptoms
  • Black lesions with feathery margins surrounded by yellow tissue are found on the leaves. Infected leaves drop prematurely.
  • Purple/red bumpy areas on first year canes may be evident.
  • Plants may be weakened due to defoliation and reduced flower production may be observed.
Black spot Drying of leaves Infected leaves

Management

  • Cultural-Roses should be planted where the sun can quickly dry the night's dew.
  • Space roses far enough apart for good air circulation Avoid overhead watering and keep foliage as dry as possible.
  • Remove infected canes and burn diseased leaves.
Image Source:
http://www.olyrose.org/images/Black%20spot-01%20-%20Copy.JPG,
https://extension.umass.edu/landscape/sites/landscape/files/fact-sheets/images/image1_1.jpeg,
http://www.improve-your-garden-soil.com/roses-black-spot.html,
http://www.rosemagazine.com/articles02/images/blackspot.jpg

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