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The warm, humid weather this spring and early summer has been ideal for plant diseases in the home landscape. Moisture loving fungi have run amok on susceptible fruits, vegetables and ornamentals. Weather conditions that leave moisture on plant foliage for long periods of time favor the development of plant diseases, and this season has provided ideal conditions so far.
Roses are considered to be high maintenance plants in a normal year, but more so in a wet year. Most varieties are susceptible to a disease called black 8pot, which can cause considerable defoliation. Black spots with feathery edges form on leaves, which then turn yellow and drop. Many rose growers use all in one rose care products that contain an insecticide, fungicide and sometimes a fertilizer. There are many brands available and they all work, but the labels can be confusing. Make sure the label indicates that the product contains a fungicide, and follow label directions.
A recent client was still having problems with black spot despite using a rose care product. A review of the label showed that the product contained an insecticide and fertilizer, but no fungicide. Mary Ann Hanson, Extension Plant Pathologist at Virginia Tech has developed a series of Plant Disease Fact sheets available online. A fact sheet on black spot can be found at
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