Even experienced gardeners are sometimes confused by the array of pesticides and special formulations available and the need to select the right materials. Pesticides may be available in one or more formulations. Pesticides used on fruit crops are most commonly sold as wettable powders, which are meant to be mixed with water, then sprayed on the crop. If the active ingredient makes up 50 percent of a wettable powder product, it is called a "50W" or "50WP." Liquid concentrates are also meant to be mixed with water, then sprayed on the crop; the active ingredient usually ranges from 12 percent to 50 percent of the product. Dusts are ready to apply as purchased; they are not mixed with water, and they usually contain 1 percent to 10 percent active ingredient.