Standard methods of applying pest-control chemicals and other compounds to plants, animals, soils, or agricultural products. For spraying, chemicals are dissolved or suspended in water or, less commonly, in an oil-based carrier. The mixture is then applied as a fine mist. In dusting, dry, finely powdered chemicals may be mixed with an inert carrier and applied with a blower. In fumigation, gases or the vapours of volatile compounds are held in contact with the materials to be treated. Sprays and dusts are used to control insects, mites, fungi, and bacterial diseases of plants; disease-spreading insects, such as lice and flies, on animals; and weeds. They are also used to apply mineral fertilizers, to increase or decrease fruit set, to delay the dropping of nearly mature fruits, and to defoliate plants to facilitate harvesting (e.g., of cotton; see defoliant). Sprays adhere to treated surfaces better than dusts do. Fumigation may be used to control insects and some diseases in stored products or to control insects and sometimes fungi and weeds in soil. Increasing use of spraying and dusting has prompted concern over their impact on the environment, the food chain, the water supply, and public health. New chemicals and precautions have only partially allayed these concerns. See also crop duster; fungicide; herbicide; insecticide
Luminous material ejected from a solar flare with sufficient velocity to escape the Sun (675 km/s) Sprays are usually seen in H alpha with complex and rapidly changing form There is little evidence that sprays are focused by magnetic fields Compare surge
a pesticide in suspension or solution; intended for spraying water in small drops in the atmosphere; blown from waves or thrown up by a waterfall scatter in a mass or jet of droplets; "spray water on someone"; "spray paint on the wall"
If someone sprays bullets somewhere, they fire a lot of bullets at a group of people or things. He ran to the top of the building spraying bullets into shoppers below The army lorries were sprayed with machine gun fire from guerrillas in the woods
When someone sprays against insects, they cover plants or crops with a chemical which prevents insects feeding on them. He doesn't spray against pests or diseases Confine the use of insecticides to the evening and do not spray plants that are in flower Because of the immunity of the immature insects, it's important to spray regularly
A dispersion of a liquid in a gas (aerosol of liquid droplets) in which the droplets have diameters greater than 10 micrometres For additional definitions and explanations, more complete dictionaries are available See
If you spray a liquid somewhere or if it sprays somewhere, drops of the liquid cover a place or shower someone. A sprayer hooked to a tractor can spray five gallons onto ten acres Two inmates hurled slates at prison officers spraying them with a hose Drops of blood sprayed across the room
If a lot of small things spray somewhere or if something sprays them, they are scattered somewhere with a lot of force. A shower of mustard seeds sprayed into the air and fell into the grass The intensity of the blaze shattered windows, spraying glass on the streets below The bullet slammed into the ceiling, spraying them with bits of plaster
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