The best way to treat brown spot on geraniums is to remove as much as the damaged material as you can. Then you can spray your plant, getting good coverage with a fungicide. Yates fungus gun is a good option or a similar product if you have something different at home.
To prevent Brown spot and other diseases in future ensure your geraniums are in an open and sunny position. Water at the base of the plants and not over the foliage where possible. Keep good gardening hygiene and remove leaf litter and plant material. Prune to ensure good air circulation.
The Palmers Team
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