Chemical control of primula leaf spot

 

If cultural methods do not control the problem, repeated applications of fungicide at seven-day intervals may be required. The fungicides tebuconazole, tebuconazole with trifloxystrobin), and triticonazole are approved for the control of rust diseases. These fungicides may give some control of primula leaf spot fungi. 

Products containing both insecticides and fungicides, usually tritconazole and acetamiprid, can be used to control primula leaf spot. Avoid using products containing insecticides unless a pest problem is actually present.