WASHINGTON PESTICIDE LAWS AND SAFETY
COMPREHENSIVE EXAM 2025/2026 QUESTIONS AND
ANSWERS GRADED A+
✔✔growth regulators - ✔✔substances (other than fertilizers or food) that alter the
growth or development of a plant or animal
✔✔adjuvants - ✔✔substance added to pesticide formulations and tank mixtures to
increase safety and effectiveness
✔✔systemic pesticides - ✔✔foliar or root-absorbed and then translocated within the
treated plant
✔✔contact pesticides - ✔✔pest must contact a treated area to be affected
✔✔stomach toxins - ✔✔must be ingested to be affective
✔✔contact toxins - ✔✔must make contact to be affective
✔✔FIFRA - ✔✔Federal insecticide, fungicide, and rodenticide act
✔✔WSDA - ✔✔Washington State Department of Agriculture
✔✔Legal controls - ✔✔limit the development of pest populations by restricting human
activities
✔✔general use pesticide - ✔✔a pesticide that can be purchased and used by the
general public
✔✔restricted use pesticide - ✔✔a pesticide that can be purchased only by certified
pesticide applicators and used only by certified applicators or persons directly under
their supervision
✔✔SLN - ✔✔special local needs
✔✔a.i. - ✔✔Active Ingredient
✔✔Active Ingredient - ✔✔the component of a pesticide that controls the target pest
✔✔Inert Ingredients - ✔✔Nonpesticidal
✔✔pesticide formulations - ✔✔mixtures of active and inert ingredients
, ✔✔Emulsifiable concentrates - ✔✔liquid formulations with the active ingredient
dissolved in one or more petroleum solvents
✔✔Emulsifiers - ✔✔usually produce a milky-white emulsion
✔✔Solutions - ✔✔formulations with a water soluble active ingredient dissolved in one or
more liquids
✔✔EC or E - ✔✔Emulsifiable Concentrates
✔✔S - ✔✔Solutions
✔✔SP - ✔✔Soluble Powders
✔✔Soluble Powders - ✔✔dry, powdered formulations containing from 25% to 80%
active ingredient; does dissolve water
✔✔WP - ✔✔Wettable Powders
✔✔Wettable Powders - ✔✔dry, finely ground formulations containing from 25% to 80%
active ingredient; does not dissolve in water
✔✔F - ✔✔Flowables
✔✔Flowables - ✔✔finely ground solid particles combined with active ingredient and
suspended in a liquid carrier
✔✔Invert Emulsions - ✔✔contain water-soluble pesticides dispersed in oil carriers
✔✔WDG - ✔✔Water-Dispersable Granules
✔✔Water-Dispersable Granules - ✔✔Similar to wettable powders, except the active
ingredient is in a granular form rather than a powder, thus dustless
✔✔D - ✔✔Dusts
✔✔Dusts - ✔✔contain a low percentage of active ingredient (0.5% to 10%), plus a finely
ground inert substance such as talc, clay, nut hulls, or volcanic ash
✔✔G and P - ✔✔Granules and Pellets
✔✔Granules and Pellets - ✔✔dry, ready-to-use materials usually containing 2% to 15%
active ingredient
COMPREHENSIVE EXAM 2025/2026 QUESTIONS AND
ANSWERS GRADED A+
✔✔growth regulators - ✔✔substances (other than fertilizers or food) that alter the
growth or development of a plant or animal
✔✔adjuvants - ✔✔substance added to pesticide formulations and tank mixtures to
increase safety and effectiveness
✔✔systemic pesticides - ✔✔foliar or root-absorbed and then translocated within the
treated plant
✔✔contact pesticides - ✔✔pest must contact a treated area to be affected
✔✔stomach toxins - ✔✔must be ingested to be affective
✔✔contact toxins - ✔✔must make contact to be affective
✔✔FIFRA - ✔✔Federal insecticide, fungicide, and rodenticide act
✔✔WSDA - ✔✔Washington State Department of Agriculture
✔✔Legal controls - ✔✔limit the development of pest populations by restricting human
activities
✔✔general use pesticide - ✔✔a pesticide that can be purchased and used by the
general public
✔✔restricted use pesticide - ✔✔a pesticide that can be purchased only by certified
pesticide applicators and used only by certified applicators or persons directly under
their supervision
✔✔SLN - ✔✔special local needs
✔✔a.i. - ✔✔Active Ingredient
✔✔Active Ingredient - ✔✔the component of a pesticide that controls the target pest
✔✔Inert Ingredients - ✔✔Nonpesticidal
✔✔pesticide formulations - ✔✔mixtures of active and inert ingredients
, ✔✔Emulsifiable concentrates - ✔✔liquid formulations with the active ingredient
dissolved in one or more petroleum solvents
✔✔Emulsifiers - ✔✔usually produce a milky-white emulsion
✔✔Solutions - ✔✔formulations with a water soluble active ingredient dissolved in one or
more liquids
✔✔EC or E - ✔✔Emulsifiable Concentrates
✔✔S - ✔✔Solutions
✔✔SP - ✔✔Soluble Powders
✔✔Soluble Powders - ✔✔dry, powdered formulations containing from 25% to 80%
active ingredient; does dissolve water
✔✔WP - ✔✔Wettable Powders
✔✔Wettable Powders - ✔✔dry, finely ground formulations containing from 25% to 80%
active ingredient; does not dissolve in water
✔✔F - ✔✔Flowables
✔✔Flowables - ✔✔finely ground solid particles combined with active ingredient and
suspended in a liquid carrier
✔✔Invert Emulsions - ✔✔contain water-soluble pesticides dispersed in oil carriers
✔✔WDG - ✔✔Water-Dispersable Granules
✔✔Water-Dispersable Granules - ✔✔Similar to wettable powders, except the active
ingredient is in a granular form rather than a powder, thus dustless
✔✔D - ✔✔Dusts
✔✔Dusts - ✔✔contain a low percentage of active ingredient (0.5% to 10%), plus a finely
ground inert substance such as talc, clay, nut hulls, or volcanic ash
✔✔G and P - ✔✔Granules and Pellets
✔✔Granules and Pellets - ✔✔dry, ready-to-use materials usually containing 2% to 15%
active ingredient
