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Pesticide Types and Formulations Questions (Free, with Answers)

10 free practice questions on pesticide types and formulations for the pesticide applicator core exam: herbicide/insecticide types, EC/WP/WDG/granule formulations, adjuvants, and compatibility. Every question has an explanation. These are original questions written from the federal core standard, not actual exam items.

1. A herbicide that kills only certain kinds of plants is called:

Answer: C. Selective herbicides control certain plants (for example, broadleaf weeds) with little harm to others. Non-selective herbicides kill most plants they contact.

2. A systemic pesticide:

Answer: A. Systemics are absorbed and translocated, so they reach pests that feed on treated tissue.

3. Which formulation abbreviation stands for emulsifiable concentrate?

Answer: C. EC (or E) is an emulsifiable concentrate: active ingredient in a petroleum solvent with emulsifiers, which forms a milky emulsion in water.

4. Wettable powder (WP) formulations require:

Answer: D. WPs form suspensions, not solutions, so they settle without agitation. They can also be abrasive to pumps and nozzles.

5. Which formulation has the LOWEST drift potential?

Answer: B. Granules are large, heavy particles, so they drift very little compared with dusts and fine sprays.

6. An adjuvant that helps a spray spread out and wet a waxy leaf surface is a:

Answer: D. Surfactants reduce surface tension so droplets spread and contact the leaf surface better.

7. A "jar test" is used to check:

Answer: C. Mixing small amounts in a jar in the right proportions shows whether products will separate, clump, or gel before you mix a full tank.

8. The term "synergism" describes:

Answer: D. Synergism means the combined effect exceeds the effects of each product alone. It can raise both efficacy and hazard.

9. A pesticide that controls mites is called a(n):

Answer: C. Acaricides (miticides) target mites and ticks. Nematicides target nematodes, avicides birds, molluscicides slugs and snails.

10. Persistence refers to:

Answer: B. Persistent pesticides remain active longer. That can give residual control but raises carryover, leaching, and residue concerns.
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