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A good garden sprayer is an essential tool even if you don't use conventional synthetic pesticides. Sprayers allow you to apply garden chemicals in precise amounts and place them exactly where they are needed. The instructions for nearly every garden chemical, except dusts, calls for using a sprayer to apply it.
Ideally you should have access to at least two -- one that you use only for herbicides (weed killers) and another one for insecticides/miticides, including insecticidal soap. While it is possible to wash spray tanks between applications it is better to keep these materials in separate, labeled tanks. This will minimize the possibility of accidentally applying herbicide on your tomatoes!
Garden sprayer sizes
Garden sprayers come in a variety of sizes and quality. I'd suggest you have a good quality 1-gallon handheld sprayer for applying herbicides and a 1-liter (quart) hand sprayer , or a second 1-gallon size, for insecticides. If you have fruit trees or grapes you may want a 4-gallon diaphragm pump backpack sprayer for applying fungicides as well. This backpack sprayer would also be useful for applying wettable powder insecticides for boxelder bug control.
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Solo garden sprayer. This new 1 gallon size can be used for herbicides ("weed killers") or insecticides.
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