Two Common Rose Diseases
Common disease problems detract from a rose’s natural beauty. Disease organisms can cause unsightly leaves, poor flower production, and even death of leaves, canes, or entire plants.
Black Spot is a fungal disease that can be identified by the roughly circular black spots that appear on the upper surface of leaves. Infected leaves eventually yellow and fall prematurely usually beginning at the bottom of the plant and progressing upward. Canes may also be infected and typically show a reddish-purple discoloration of tissue that later becomes blackened. These legions usually do not kill the rose canes but they do allow the fungus to survive over the winter.
Powdery Mildew is a widespread fungal disease of roses. It is considered more unsightly than harmful. Infected plants have whitish-gray powdery patches of fungus on the leaves, flower buds or stems. Leaves become distorted and eventually fall prematurely. Heavily infected flower buds usually fail to open properly. Powderly mildew spores are easily spread by wind to nearby healthy plants. Many weather conditions also encourage powdery mildew including; little or no rain, temperature range of 70-80 degrees, It is often seen in spring and fall.
We have proven techniques to help combat these funguses to keep your roses beautiful and healthy. Give us a call!
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