A garden sprayer is an invaluable tool in a gardener's tool shed. They provide a simple and effective way to deliver just the right amount of material in the right place.
Before choosing a garden sprayer, you must identify the problem. Some areas can be treated topically with a small amount of pesticide, others require a larger volume sprayer.
It's a good idea for gardeners to have at least two sprayers, one for herbicides and one for insecticides. Many herbicide residues are difficult to completely remove from spray cans, and this leftover residue can harm your plants.