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Disease Control

Although many people find that tree Peonies are free from disease, they are, in fact, susceptible to a number of troubles, some of minor and others of major importance. These diseases are of various types, including blights, stem rot, wilt, root knot, leaf spots, and virus troubles.

Certain other cultural practices will also prove beneficial. When making new plantings, the clumps should be given adequate space in order to prevent the development of large dense clusters, which serve to promote conditions favorable to attacks of the fungus. For the same reason, old established plantings should be dug and divided when necessary. The use of sunny, open exposures will aid considerably in preventing serious epidemics of the Botrytis blight disease. Field observations indicate that Peonies varieties vary widely with regard to relative susceptibility to the disease.

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