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black spot

Good Morning Duncan, In answer to your black spot question. I wash my roses
early, early, early in the morning as often as possible. Yes I wet the
leaves and the whole plant. Strong jets of water also dislodge any insects
that may be passing by.I pay particular attention to the lower area. This is
to keep the fungus spores from drifting up on to my lovely hybrid roses.
Also I make sure there is plenty of circulation surrounding the rose to
insure proper drying quickly. No black spot yet.
If growing roses are in a border among shrubs that restrict circulation we
recommend using the organic baking soda formula as a preventative, about
once a week and before signs of black spot occur. Two tsp.baking soda, two
tablespoons liquid detergent, two tablespoons cooking oil to a gallon of
water. Do NOT spray this solution in the heat of the day.
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