Diseases
Pseudomonas cichorii - garden mums
Bacterial leaf spot is sometimes caused by Pseudomonas species. Phyton and other copper products are very toxic to bacteria as well as many fungi. However, pesticides are only marginally effective unless coupled with sound cultural practices. Since bacteria are spread by water splash, insects, handling and pesticide applications, diseased plants should be promptly isolated from healthy plants or discarded. Adequate space should be provided to allow for quick drying after watering. Discontinue overhead watering when bacterial diseases are evident. Reduce relative humidity and avoid prolonged periods of leaf wetness.
Fact Sheet: http://www.umass.edu/umext/floriculture/fact_sheets/pest_management/chrys_diseases.htm
"Garden Mums- Past Problems and Production Tips"
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