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If you see concentric rings on your climbing hydrangea's leaves, alternating in color from dark green to light green, your plants have hydrangea ring-spot virus. You also may find small spots of dead tissue on the foliage. There is no cure for plant viruses, so remove infected plants promptly and destroy them. If the infection is mild and doesn't seem to be harming the overall performance of the plant, you can simply learn to live with annual leaf spots. Do not take cuttings from infected plants, for they will be infected, and disinfect pruning shears after each cut to avoid spreading the virus.
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