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a machine or device for atomizing and applying liquid pesticides in the form of solutions, suspensions, and emulsions of varying concentration to plants for the purpose of controlling pests, diseases, and weeds. Sprayers are also used for insect control in buildings.

There are various types of sprayers for treating field crops, orchards, and vineyards. The spraying mechanism may be hydraulic, fan, or aerosol. There are portable sprayers, horse-drawn sprayers, tractor-drawn sprayers (mounted or trailer) and sprayer planes. In hydraulic sprayers, the toxic liquid chemical is fed by pressure to nozzles, in which it is atomized and discharged onto the object being treated. In fan sprayers, the toxic chemical is atomized in nozzles and then expelled by a jet of air onto the object being treated. In some sprayers the stream of air also splits the chemical into even smaller particles.

The basic components and mechanisms of a sprayer are a tank with a stirrer to mix the chemical, a pump to create the pressure necessary to atomize the liquid and give its particles a certain velocity, a fan (in fan sprayers), a hose, a pressure regulator, atomizing nozzles, and a suction cock for reloading the sprayer. A pressure gauge monitors the degree of compression of the liquid. The working elements of tractor-drawn sprayers are driven by a takeoff shaft of the tractor engine. Portable sprayers are operated manually, and horse-drawn sprayers are operated manually or by a special engine. The sprayers on planes are operated by a vane mounted on the aircraft.


Shamaev, G. P., and S. D. Sheruda. Mekhanizatsiia rabot po zashchite sel’skokhoziaistvennykh kul’tur ot vreditelei i boleznei. Moscow, 1964.


References in periodicals archive ?
1 and 2) the fluid dispersion (g) for each sprayer was calculated by the following relation:
Descriptive statistics of the vertical vibration of the spray boom (rolling) according to the sprayer and displacement speed for the route conditions: (A) Gentle to undulating; (B) Undulating and (C) Impact/collision Self-propelled sprayers/Displacement speeds A.
During the 1860s and '70s, sprayers with hand-operated pumps were developed, but they were slow and tedious to use.
Additional tests in an apple orchard demonstrated that the new sprayer reduced spray loss beyond tree canopies between 40 and 87 percent, airborne spray drift by up to 87 percent, and spray loss on the ground between 68 and 93 percent.
Using the PreGro Sprayer to administer neonicotinoid-free solutions is one way environmentally conscious consumers can respond to the honeybee crisis while still keeping their gardens healthy.
Guideline only) Production line paint sprayers, earn between PS15,000 and PS18,000 a year; vehicle paint sprayers, between PS15,000 and PS22,000; construction paint sprayers can earn between PS15,000 and PS22,000.
Spray intervals were shortened, and spray coverage improved with a new recirculating tunnel sprayer.
Most of the growth in the sprayer industry has been in the grower market in recent years," says Mark Sharitz, Director of Marketing for AGCO Application, Seeding and Tillage Equipment.
The Ultimate Concrete Form Sprayer is a wheeled cart model with a 150-psi (10 bar), 10-gal.
When buying either type, it pays to choose the best-quality sprayer you can afford.
David White, farming consultant and independent agronomist in Strutt & Parker's Morpeth office, said: "Crop sprayer operators who use pesticides on either their own land or their employer's land can do so without holding a recognised certificate of competence provided they were born before December 31 1964.