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spots are easily seen and may be serious on roses, which
is very commonly attacked by black spot. Spores are
easily spread by water splash and infections take hold
when the water remains on the leaf for about 6-7 hours.
Areas with high summer rainfall and high humidity usually
have the highest incidence of black spot. Treatment
of the disease is year round as the fungus overwinters
on stems and leaf litter. All diseased leaves should
be raked up and disposed of. Diseased stems need to
be pruned back to healthy wood. Spray roses with a Lime
Sulphur spray in winter and start an early preventative
spray program at the beginning of spring once foliage
black spots on the leaves which are fringed with yellow
margins. The spots are black and can also appear on
the stems. The leaves will fall prematurely and if left
unchecked can lead to defoliation of the plant.