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Diplocarpon rosae
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Diplocarpon rosae

fungus

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black spot disease

  • Black spot on rose leaves
    In black spot

    …disease caused by the fungus Diplocarpon rosae. On rose plants, the spots are roundish and up to 1 cm (0.5 inch) in diameter with fringed margins. Leaves on susceptible varieties turn yellow and drop early. Affected plants may defoliate twice in a season, are greatly weakened, produce fewer and inferior…

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