After using Ferti-Lome Consan 20, we would recommend waiting until the product has had time to dry to water your lawn. The application of the product can be done weekly thereafter until the disease is controlled.
The amount of finished gallons of solution will vary with the Ferti-Lome Consan 20 depending on the application. Please provide the targeted pest and area of treatment for the amount of gallons.
Ferti-Lome Consan 20 is not a systemic and needs to be applied directly to the foliage of the tree. Leaf spot is typically treated by spraying the tree directly. We do have equipment like the Chapin Slide Pump Sprayer which can spray up to 30 feet.
Ferti-Lome Consan 20 would be used in fountains after draining it to treat only. I was able to find a helpful article here that gives advice on preventing.
Fertilome Consan 20 is not labeled to treat cercospora leaf spot. We suggest Fertilome F-Stop Lawn and Garden Fungicide or Garden Tech Daconil for cercospora on privet/ligustrum trees.