LPHA (Liter/ha) - Liters per hectare.
Mesh - The number of openings per inch or centimeter in a screen type strainer.
Micron - 1/1000 millimeter or 1/25000 inch.
Miscible - Mixes easily with water, a term applies to oils that have an agent added to the oil that makes it easy to dilute with water and remain as a mixture without separation.
Newtonian Fluid - A fluid in which the rate of shear is proportional to the shear force, e.g., water.
Non-Newtonian Fluid - A term used in the deformation and flow of liquids where the rate of shear is disproportional to the shear force.
NTSB - National Transportation Safety Board.
Organic Compound - A compound known to contain the carbon atom
Pesticide - Any substance used for controlling, preventing, destroying, repelling or mitigating any pest. Includes fungicides, herbicides, insecticides, nematocides and rodenticides.
Pre-Emergence Treatment - Applied to weeds or soil after the crop is sown but before it has emerged from the soil (may be before or after the weeds have emerged - using a residual or contact weed killer.).
Pre-Planting Treatment - A treatment to the weeds or soil before the crop is planted.
PSI, PSIG - Pounds per square inch or mercury; a measure of pressure.
R - Restricted category. Aircraft may exceed certified limits for specific purposes.
RPV - Remotely Piloted Vehicle; a drone.
Slurry - Thick suspension of pesticide such as used in treating seeds; paste-like preparation resulting from mixing pesticides with water.
Solution - A homogeneous mixture of two or more constituents in which the particles are of molecular magnitude. Will not settle or separate.
Spray Volume Terms and Symbols-
Term Symbol Spray Volume (GPA)
ultra-ultra low volume u-ulv less than 0.05
ultra-low volume ulv 0.05 to 0.5
low volume lv 0.5 to 5.0
medium volume mv 5.0 to 50
high volume hv greater than 50
Spray Volume - Total volume of pesticide and liquid carrier applied per unit area.
Spreader - Adjuvant added to the sprays to make the material spread more readily over the foliage rather than deposited in spots.
SS - Stainless Steel.
Standard Temperature (I.C.A.O.) - Adopted by International Civil Aviation Organization: mean sea level (MSL), pressure 1013.25 mb, temperature 15° C.
Suck-back - Partial vacuum created by recirculation bypass feature in 3-way (or control) valve causes negative boom pressure and thus a flow of liquid back toward the tank.
Suspension - A dispersion of small particles of a solid or an immiscible liquid in another liquid or gas. The dispersed particles have little or no affinitiy for the dispersed medium.
Swath Width - The width of spray application (span) in which the amount of spray expressed in various ways equals or exceeds a specified amount thought to produce the requisite pesticide effectiveness.
Systematic - A pesticide applied to soil or foliage, absorbed by plant parts, translocated to other parts of an organism and imparting protection from insect or disease attacks; or, the action of a herbicide in affecting the whole plant, resulting in its death.
TAG - Tactical Advisory Group.
Volume-median Diameter (vmd) - The droplet size diameter that divides the spray volume into equal parts; 50% of the volume is in droplets below the vmd and 50% is above.
VRU - Variable Restrictor Unit, a flow rate regulator in some rotating atomizers.
Wettable Powder - A pesticidal formulation manufactured by milling a pesticide, an inert dilutent and a wetting agent to a fine powder which is easily wetted by water and will go into a semi-permanent suspension.
(Information derived in part from Ekblad and Akesson, 1980; and Quantick, 1985a)
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