DC Pesticide Applicator key terms

Any organism-insect, weed, fungus, rodent, or other-that competes with humans for food or space, damages property or crops, or spreads disease and therefore warrants control.

A decision-making approach that combines biological, cultural, mechanical, and chemical controls, using pesticides only when monitoring shows other tactics cannot keep a pest below the level that causes unacceptable damage.

The pest population density at which control measures should be started to prevent the pest from reaching the economic injury level, where damage cost equals treatment cost.

The lowest pest population density that will cause crop damage equal in value to the cost of controlling that pest; the break-even point above which treatment pays.

The pest level at which a applicator decides to act, set at or below the economic injury level so treatment occurs before losses exceed control costs.

Systematic field inspection-counting pests, checking damage, and recording crop stage-to determine whether pest numbers justify treatment and to select the right control.

Any substance or mixture intended to prevent, destroy, repel, or mitigate a pest, including insecticides, herbicides, fungicides, rodenticides, and plant growth regulators.

The component of a pesticide product that actually kills, repels, or otherwise controls the target pest; its amount and identity are listed on the label.

Any substance in a pesticide product other than the active ingredient-such as solvents, carriers, or surfactants-that helps deliver or stabilize the active ingredient but is not listed by name on the label.

The physical form in which a pesticide is sold, such as emulsifiable concentrate, wettable powder, granular, or flowable, determined by how the active ingredient is mixed with carriers and other ingredients.

A liquid formulation in which the active ingredient is dissolved in an organic solvent with an emulsifier, so it mixes with water to form a milky suspension for spraying.

A dry powder formulation that, when mixed with water, forms a suspension for spraying; it requires constant agitation because the particles settle out of suspension.

A surface-active agent added to spray mixtures to reduce surface tension, improving wetting, spreading, or penetration of the pesticide on the target surface.

Any substance added to a spray mixture to modify its properties or performance, such as surfactants, stickers, spreaders, or drift-control agents; it is not itself a pesticide.

The combination of two or more pesticide products (or a pesticide and fertilizer) in one spray tank; compatibility must be checked first to avoid clumping, separation, or reduced effectiveness.

The ability of two or more products to be mixed and applied together without physically or chemically interfering with each other or harming the treated surface.

The federally approved information attached to a pesticide container that legally defines how the product may be used, including rates, sites, safety precautions, and restrictions.

All written, printed, or graphic material that accompanies a pesticide or its container-including the label, supplemental labels, brochures, and worker protection materials-and is legally part of the product's directions.

A pesticide that may be sold and used only by certified applicators or persons under their direct supervision because it poses a higher risk to humans or the environment.

A pesticide that the general public may buy and use according to label directions without certification, because it poses lower risk when used as directed.

A person who has passed the required competency examination and holds a current certification permitting use or supervision of restricted-use pesticides under the law.

A legal relationship in which a certified applicator is available to direct and control the use of a restricted-use pesticide by a noncertified person, with responsibility for that use.

The word-DANGER, WARNING, or CAUTION-printed on a pesticide label to indicate the relative acute toxicity of the product and the level of precaution required.

One of four classes (I through IV) into which pesticides are grouped by acute oral, dermal, inhalation, and eye or skin irritation data, each tied to a signal word and precautionary statements.

The adverse health effect produced by a single short-term exposure to a pesticide, usually expressed as an LD50 or LC50 value; it determines the label signal word.

Health effects that develop after repeated or long-term exposure to a pesticide, such as organ damage, cancer, or reproductive harm, and are addressed by label precautions and PPE.

The dose of a pesticide that kills 50 percent of a test population of animals; a lower LD50 means a more acutely toxic product.

Clothing and gear-such as gloves, coveralls, respirators, eyewear, and boots-that the label requires to reduce applicator exposure to a pesticide.

A device worn over the nose and mouth that filters or supplies air to protect the wearer from inhaling pesticide vapors, mists, or dusts; it must match the label's specifications.

The minimum number of days that must pass between the last pesticide application and harvest of the crop, stated on the label to keep residues within legal limits.

The time that must pass after a pesticide application before workers may enter the treated area without protective equipment, set by the label to prevent harmful exposure.

The maximum legal residue level of a pesticide allowed in or on a harvested commodity, established by EPA; exceeding it makes the food adulterated and illegal to sell.

Pesticide or its breakdown products remaining on or in a treated crop, soil, water, or surface after application, which must stay within legal tolerance limits.

The movement of pesticide off the target site by wind or air currents during or after application, which can damage sensitive crops, harm wildlife, and cause liability.

A location near a treatment site-such as a school, hospital, home, water body, or sensitive crop-where pesticide drift or runoff could cause harm and requires extra caution.

An untreated strip of land between a pesticide application area and a sensitive area, kept free of application to protect people, water, or sensitive crops from drift and runoff.

The component that breaks spray liquid into droplets and determines droplet size, spray pattern, and application rate; worn or wrong nozzles cause poor coverage or drift.

The process of measuring and adjusting spray equipment so it delivers the intended amount of pesticide uniformly over the treated area, reducing under- or over-application.

The amount of pesticide product applied per unit area or volume, such as gallons per acre or pounds per 1,000 square feet, as specified on the label.

Mixing a pesticide concentrate with water or another carrier to reach the label-specified concentration for the spray tank before application.