Glossary 5

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Nymph

Back 1

The development state of insects with gradual metamorphosis that hatches from the eggs. Nymphs become adults

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Occasional Pest

Back 2

A pest that does not recur regularly but causes damage intermittently as a result of changing environmental conditions or fluctuations in populations of natural enemies.

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Oncogen

Back 3

A substance or agent able to induce tumors (not necessarily cancerous) in living tissues.

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Oral Toxicity

Back 4

The ability of a pesticide to be poisonous when taken by mouth.

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Organophosphates

Back 5

A large group of insecticides, miticides, and nematicides that contain the element phosphorus and are cholinesterase inhibitors.

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Overspray

Back 6

The direct application of pesticide outside of the target area due to applicator error.

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Oxidizer

Back 7

A highly reactive chemical that is potentially explosive and a fire hazard under certain conditions.

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Parasite

Back 8

A plant, animal, or microorganism living in, on, or with another living organism for the purpose of obtaining all or part of its food.

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Particle Drift

Back 9

The airborne movement of a pesticide dusts or pesticide-contaminated soil from the application site.

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Pathogen

Back 10

A disease-causing organism.

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Pellet (P or PS)

Back 11

A pesticide formulation consisting of dry active and inert ingredients pressed into an uniformly sized and shaped ready-to-use material; larger than granules.

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Penetrant

Back 12

An adjuvant added to a spray mixture to enhance the absorption of a pesticide.

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Penetration

Back 13

The leaking of a pesticide through seams, pinholes, and tears in personal protective equipment.

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Percolation

Back 14

The downward movement of water through soil.

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Perennial

Back 15

A plant that lives for more than two years.

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Permeability

Back 16

The rate at which water and dissolved pesticides can flow through porous materials such as soil, gravel, or sand.

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Permeation

Back 17

The movement of pesticide directly though intact personal protective equipment material.

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Persistence

Back 18

The ability of a pesticide to remain present and active in its original form over time.

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Persistent Pesticide

Back 19

A pesticide (or its metabolites) that remains active in the environment more than one growing season. Some compounds can accumulate in animal and plant tissues or remain in the soil for years.

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Personal Protective Equipment (PPE)

Back 20

Devices and clothing that protect pesticides applicators, handlers, and workers from exposure to pesticides.

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Pest

Back 21

Any living thing (e.g insect, bacterium, fungus, nematode, weed, virus, rodent) that has an undesirable impact on something that is important to us.

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Pest Control Device

Back 22

Any mechanical instrument (other than a firearm) intended for trapping, destroying, repelling, or mitigating any pest. Examples include rodent traps and black-light insect traps.

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Pesticide

Back 23

Any substance or mixture of substances intended for preventing, destroying, repelling, or mitigating any pest, and any substance or mixture of substances or mixture of substance used as a plant regulator, defoliant, or desiccant.

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Pesticide Concentrate

Back 24

A pesticide formulation before any dilution occurs.

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Pesticide Handler

Back 25

A person who works directly with pesticides, such as during mixing, loading, transporting, cleaning, storing, disposing, and applying, or who repairs pesticide application equipment.

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Pesticide-Impregnated Material

Back 26

Pet collars, livestock ear tags,pressure-treated lumber, plastic pest strips, and other products with pesticides incorporated into them. The pesticides either protect the material or are slowly emitted from the material to protect the site for which they are used.

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Pesticide Injury

Back 27

Direct damage of tissue (e.g. skin blisters) caused by exposure to pesticides.

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Pesticide Poisoning

Back 28

Illness or adverse effect on a bodily system caused by exposure to pesticide.

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Pesticide Use

Back 29

A task such as mixing, loading, applying, and disposing of pesticides; storing and transporting a pesticide after the manufacturer's seal has been broken; and cleaning pesticide equipment.

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pH

Back 30

A measure of acidity/ alkalinity; acid below pH 7, basic or alkaline above pH 7.

Front 31

Pheromone

Back 31

A substance emitted by an animal to influence the behavior of other animals of the same species.

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Photodegradation

Back 32

Breakdown of chemicals by the action of sunlight.

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Physical Incompatibility

Back 33

The failure of two pesticide products to remain uniformly mixed when added to the same spray tank.

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Phytotoxicity

Back 34

Chemical injury to plants.

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Piscicide

Back 35

A chemical used to control pest fish.

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Placards

Back 36

Public notices U.S. Department of Transportation placards are diamond-shaped warning signs placed on all vehicles that transport certain types and quantities of hazardous materials.

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Plant Growth Regulators (PGR)

Back 37

A pesticide used to regulate or alter the normal growth of plants or the development of their plant parts.

Front 38

Plant Penetrant

Back 38

Adjuvant that enhances the penetration of a pesticide into a plant.

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Point of Runoff

Back 39

When a spray starts to run or drip from the leaves and stems of plants, or the hair or feathers of animals.

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Point-Source Pollution

Back 40

The contamination of water and soil from a specific, identifiable place or location, such as a spill site or a permanent mixing, loading, and cleaning sites.

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Poison Control Center

Back 41

An agency, generally a hospital, that has current information on proper first-aid techniques and antidotes for poisoning emergencies.

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Postemergence

Back 42

A herbicide that is applied after weeds or crop plants have appeared through the soil.

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PPB

Back 43

Parts per billion. A way of expressing amounts of chemicals in or on foods, plants, animals, water, soil, or air.

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PPM

Back 44

Parts per millions.

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Precipitate

Back 45

A solid substance that forms in a liquid and settles to the bottom of a container, a material that no longer remains in suspension.

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Predacide

Back 46

A pesticide used to control predaceous animals, usually mammals.

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Predator

Back 47

An animal that attacks, kills, and feeds on other animals (e.g. coyotes, hawks, spiders, ladybugs).

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Preemergence

Back 48

A herbicide that is applied before weeds or crop plants have appeared through the soil.

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Preharvest Interval

Back 49

The minimum number of days permitted by law between the last pesticide application and the harvest date.

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Premix

Back 50

A pesticide product formulated by the manufacturer with more than one active ingredient.

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Preplant Pesticide

Back 51

A pesticide applied before planting a crop