Josh from Topeka, Kansas writes
Emerald Fungicide is most effective when applied preventively. It should be applied prior to any sign of disease. It should be applied in rotation with other products and is also safe for tank mixing. For best results, two applications may be necessary. Please refer and follow the product label for more specific usage instructions. For specific timing of application, please consult with your local Master Gardener.
Answer last updated on: 01/15/2015