An alternative is to use the Gilmour Hose End sprayer, also available at Home Depot, Lowe's, etc. There is an easy to use dial on the top so you adjust the number of table spoons per gallon of water, no math needed, just what the chemical instructions say. Do NOT add water, just fill the sprayer bottle. Attach it to the hose and spray away! The nozzle swivels so you can spray upside down to get the leaf undersides, then flip it and spray the tops. It's a very easy, convenient sprayer to use. The pump ones will use less chemical as you put it where you want it. Hose end units use quite a bit more chemical, but they're faster and easier to use.