WASHINGTON PESTICIDE LAWS PRACTICE EXAM
QUESTIONS AND ANSWERS 2025/2026 ALL RATED A+
✔✔Anti-Siphoning Device - ✔✔A hose attachment designed to prevent back flow into a
water source. Used to prevent the flow of pesticide mixes from spray tanks.
✔✔Anti-Transpirant - ✔✔A chemical applied to a plant to reduce the rate of transpiration
or water loss.
✔✔Aquifer - ✔✔A permeable zone of rock, sand, gravel, or limestone below the earths
surface saturated with water.
✔✔Arachnid - ✔✔A wingless arthropod with two body regions and four pairs of joined
legs. Examples are spiders, ticks, and mites.
✔✔Arthropod - ✔✔An invertebrate animal characterized by a jointed body and limbs
usually a hard body covering that is molted at intervals. Examples are insects, mites,
and crayfish.
✔✔Atropine (Atropine Sulfate) - ✔✔An antidote used to treat organophosphate and
carbamate poisoning.
✔✔Attractant - ✔✔A substance or device to lure insects or other pests to a trap or
poison bait.
✔✔Avicide - ✔✔A chemical used to kill or repel birds.
✔✔Bacteria - ✔✔Microscopic organisms, some of which are capable of producing
diseases in plants and animals.
✔✔Bactericide - ✔✔A chemical used to control bacteria.
✔✔Bait - ✔✔A food or other substance used to attract a pest to a pesticide or trap
where it is destroyed.
✔✔Band Application - ✔✔Application of a pesticide or other material in or beside a crop
row rather than over the entire field. (See Broadcast Application)
✔✔Basal Application - ✔✔Application to the plant stems or trunks at or just above
ground.
✔✔Beneficial Insect - ✔✔An insect that is useful or helpful to humans. Examples are
pollinators, parasites, and predators of pest.
,✔✔Biennial - ✔✔A plant that completes its life cycle in two years.
✔✔Biological Control - ✔✔A pest management strategy that uses predators, parasites,
and diseases-causing organisms. May be naturally occurring or introduced.
✔✔Biomagnification - ✔✔The process where some organisms accumulate chemical
residues in higher concentrates than those found in the organisms they consume.
✔✔Botanical Pesticide - ✔✔A pesticide produced from chemicals found in plants.
Examples are nicotine, pyrethrum, and strychnine.
✔✔Brand Name - ✔✔The name, number or designation of a specific pesticide product
or device made by a manufacturer or formulator.
✔✔Brodcast Application - ✔✔The uniform application of a pesticide or other material
over an entire field or area.
✔✔Broadleaf Plants - ✔✔Plants with broad, rounded or flattened leaves with netted
veins such as dandelions and roses.
✔✔Broad-Spectrum Pesticides - ✔✔A pesticide that is effective against a wide range of
pest. Usually refers to insecticides or fungicides.
✔✔Buffers - ✔✔Adjuvants used to retard chemicals degradation of some pesticides by
lowering the PH of Alkaline water.
✔✔Calibrate, Calibration - ✔✔To adjust equipment according tho the amount of material
applied to a target area.
✔✔Carbamates - ✔✔A group of pesticides containing nitrogen, formulated as
insecticides (Sevin, Furadan, Lannates), fungicides (Mancozeb, Maneb), and herbicides
(IPC, CIPC).
✔✔Carcinogenic - ✔✔The ability of a substance or agent to induce malignant tumors
(cancer).
✔✔Carrier - ✔✔1) an inert liquid, solid, or gas added to an active ingredient to make a
pesticide formulation.
2) the material, usually water or oil, used to dilute the formulated product or application.
✔✔Casual Organisms - ✔✔The organism (pathogen) that produce a given disease.
✔✔Chemical Control - ✔✔A pest management strategy that involves the use of
naturally derived or synthetic chemicals that kill, attract, repel, or otherwise control the
, growth of pest, plants, animals, and microorganisms. Examples are avicides,
insecticides, and rodenticides.
✔✔Chemical Name - ✔✔The scientific name of the active ingredient(s) found in the
formulated product. This complex name is derived from the chemical structure of the
active ingredients.
✔✔Chemigation - ✔✔The application of fertilizers or pesticides to soil or plants by
inclusion in irrigation water.
✔✔Chemtrec - ✔✔The Chemical Transportation Emergency Center, which has a toll-
free number (1-800-424-9300) that provides 24-hour information for chemical
emergencies such as spills, leaks, fires, or accidents.
✔✔Chemosterilant - ✔✔A chemical compound capable of preventing animal
reproduction.
✔✔Chlorinated Hydrocarbon - ✔✔A pesticide containing chlorine, carbon, and
hydrogen. Many are persistent in the environment. Examples are chlordane, DDT, and
methoxychlor.
✔✔Chlorosis - ✔✔The yellowing of a plant's normally green tissue.
✔✔Cholinesterase - ✔✔A chemical catalyst (enzyme) found in animals that regulates
the activity of nerve impulses.
✔✔Chronic Toxicity - ✔✔The ability of a material to cause injury from repeated,
prolonged exposure to small amounts. (See Acute Toxicity)
✔✔Commercial Applicator - ✔✔A type of applicator certification or license for an owner
or head of a business that commercially applies pesticides on lands of another.
✔✔Commercial Consultant - ✔✔A type of applicators certification of license for a
salesperson who offers technical advice or recommendations to pesticide users.
✔✔Commercial Operator - ✔✔A type of certification or license for an employee of a
commercial applicator to supervise or apply pesticides on lands of another.
✔✔Common Name - ✔✔A name given to a pesticide active ingredient by a recognized
committee on pesticide nomenclature. Many pesticides are known by a number of trade
or brand names, but the active ingredient(s) has only one recognized common name
(e.g. the common name fro Sevin insecticide is carbaryl).
QUESTIONS AND ANSWERS 2025/2026 ALL RATED A+
✔✔Anti-Siphoning Device - ✔✔A hose attachment designed to prevent back flow into a
water source. Used to prevent the flow of pesticide mixes from spray tanks.
✔✔Anti-Transpirant - ✔✔A chemical applied to a plant to reduce the rate of transpiration
or water loss.
✔✔Aquifer - ✔✔A permeable zone of rock, sand, gravel, or limestone below the earths
surface saturated with water.
✔✔Arachnid - ✔✔A wingless arthropod with two body regions and four pairs of joined
legs. Examples are spiders, ticks, and mites.
✔✔Arthropod - ✔✔An invertebrate animal characterized by a jointed body and limbs
usually a hard body covering that is molted at intervals. Examples are insects, mites,
and crayfish.
✔✔Atropine (Atropine Sulfate) - ✔✔An antidote used to treat organophosphate and
carbamate poisoning.
✔✔Attractant - ✔✔A substance or device to lure insects or other pests to a trap or
poison bait.
✔✔Avicide - ✔✔A chemical used to kill or repel birds.
✔✔Bacteria - ✔✔Microscopic organisms, some of which are capable of producing
diseases in plants and animals.
✔✔Bactericide - ✔✔A chemical used to control bacteria.
✔✔Bait - ✔✔A food or other substance used to attract a pest to a pesticide or trap
where it is destroyed.
✔✔Band Application - ✔✔Application of a pesticide or other material in or beside a crop
row rather than over the entire field. (See Broadcast Application)
✔✔Basal Application - ✔✔Application to the plant stems or trunks at or just above
ground.
✔✔Beneficial Insect - ✔✔An insect that is useful or helpful to humans. Examples are
pollinators, parasites, and predators of pest.
,✔✔Biennial - ✔✔A plant that completes its life cycle in two years.
✔✔Biological Control - ✔✔A pest management strategy that uses predators, parasites,
and diseases-causing organisms. May be naturally occurring or introduced.
✔✔Biomagnification - ✔✔The process where some organisms accumulate chemical
residues in higher concentrates than those found in the organisms they consume.
✔✔Botanical Pesticide - ✔✔A pesticide produced from chemicals found in plants.
Examples are nicotine, pyrethrum, and strychnine.
✔✔Brand Name - ✔✔The name, number or designation of a specific pesticide product
or device made by a manufacturer or formulator.
✔✔Brodcast Application - ✔✔The uniform application of a pesticide or other material
over an entire field or area.
✔✔Broadleaf Plants - ✔✔Plants with broad, rounded or flattened leaves with netted
veins such as dandelions and roses.
✔✔Broad-Spectrum Pesticides - ✔✔A pesticide that is effective against a wide range of
pest. Usually refers to insecticides or fungicides.
✔✔Buffers - ✔✔Adjuvants used to retard chemicals degradation of some pesticides by
lowering the PH of Alkaline water.
✔✔Calibrate, Calibration - ✔✔To adjust equipment according tho the amount of material
applied to a target area.
✔✔Carbamates - ✔✔A group of pesticides containing nitrogen, formulated as
insecticides (Sevin, Furadan, Lannates), fungicides (Mancozeb, Maneb), and herbicides
(IPC, CIPC).
✔✔Carcinogenic - ✔✔The ability of a substance or agent to induce malignant tumors
(cancer).
✔✔Carrier - ✔✔1) an inert liquid, solid, or gas added to an active ingredient to make a
pesticide formulation.
2) the material, usually water or oil, used to dilute the formulated product or application.
✔✔Casual Organisms - ✔✔The organism (pathogen) that produce a given disease.
✔✔Chemical Control - ✔✔A pest management strategy that involves the use of
naturally derived or synthetic chemicals that kill, attract, repel, or otherwise control the
, growth of pest, plants, animals, and microorganisms. Examples are avicides,
insecticides, and rodenticides.
✔✔Chemical Name - ✔✔The scientific name of the active ingredient(s) found in the
formulated product. This complex name is derived from the chemical structure of the
active ingredients.
✔✔Chemigation - ✔✔The application of fertilizers or pesticides to soil or plants by
inclusion in irrigation water.
✔✔Chemtrec - ✔✔The Chemical Transportation Emergency Center, which has a toll-
free number (1-800-424-9300) that provides 24-hour information for chemical
emergencies such as spills, leaks, fires, or accidents.
✔✔Chemosterilant - ✔✔A chemical compound capable of preventing animal
reproduction.
✔✔Chlorinated Hydrocarbon - ✔✔A pesticide containing chlorine, carbon, and
hydrogen. Many are persistent in the environment. Examples are chlordane, DDT, and
methoxychlor.
✔✔Chlorosis - ✔✔The yellowing of a plant's normally green tissue.
✔✔Cholinesterase - ✔✔A chemical catalyst (enzyme) found in animals that regulates
the activity of nerve impulses.
✔✔Chronic Toxicity - ✔✔The ability of a material to cause injury from repeated,
prolonged exposure to small amounts. (See Acute Toxicity)
✔✔Commercial Applicator - ✔✔A type of applicator certification or license for an owner
or head of a business that commercially applies pesticides on lands of another.
✔✔Commercial Consultant - ✔✔A type of applicators certification of license for a
salesperson who offers technical advice or recommendations to pesticide users.
✔✔Commercial Operator - ✔✔A type of certification or license for an employee of a
commercial applicator to supervise or apply pesticides on lands of another.
✔✔Common Name - ✔✔A name given to a pesticide active ingredient by a recognized
committee on pesticide nomenclature. Many pesticides are known by a number of trade
or brand names, but the active ingredient(s) has only one recognized common name
(e.g. the common name fro Sevin insecticide is carbaryl).
