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Iowa Pesticide License Practice Test (Free Core Exam Questions)

Preparing for the Iowa pesticide applicator exam? In Iowa, applicator certification and licensing are handled by the state pesticide regulatory agency, generally the Iowa Department of Agriculture and Land Stewardship. Like every state, Iowa requires applicators to show competency in the core (general standards) areas set out in federal rules: label comprehension, safety, environmental protection, pests, pesticides, equipment, application methods, laws, supervision, and professionalism. Most candidates also take a state laws section and one or more category exams.

Confirm current exam requirements, manuals, fees, and testing locations directly with the Iowa Department of Agriculture and Land Stewardship. This site is unofficial and not affiliated with any Iowa agency.

10 free Iowa core exam practice questions

1. An action threshold is:

Answer: B. Thresholds tie treatment decisions to pest numbers or damage levels, not the calendar.

2. 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.

3. What is the purpose of the agitation system in a sprayer tank?

Answer: A. Agitation keeps suspensions and emulsions uniform so every part of the tank is applied at the correct concentration.

4. Crack-and-crevice treatment is typically used in:

Answer: B. Crack-and-crevice treatment targets pest harborage while minimizing exposed surfaces.

5. State pesticide laws can be:

Answer: B. States may impose additional requirements (licensing, recordkeeping, notification) beyond federal law.

6. Who must provide required PPE to noncertified applicators using RUPs under supervision?

Answer: D. The certified applicator or employer is responsible for making sure required PPE is provided, clean, and used properly.

7. Posting warning signs at a treated area when required serves to:

Answer: A. Required posting informs people of restricted entry and reduces accidental exposure.

8. A tractor travels 176 feet in 20 seconds. What is its speed in miles per hour? (1 mph = 88 ft per minute)

Answer: B. 176 ft in 20 s = 528 ft per minute. 528 / 88 = 6 mph.

9. Which signal word indicates the highest acute toxicity to humans when taken orally?

Answer: B. DANGER-POISON (plus the skull and crossbones and PELIGRO) marks the most acutely toxic products, Toxicity Category I by oral, dermal, or inhalation route.

10. For most pesticide handlers, the most common route of exposure is:

Answer: A. Skin contact is the most common way applicators and handlers are exposed, especially during mixing and loading.
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How to study for the Iowa core exam

  1. Get the core manual edition your state uses (many states are moving to the 2025 3rd edition national core manual during 2026) and any Iowa law supplement.
  2. Take a timed practice test to find your weak areas.
  3. Re-read those chapters, then retest until you're consistently above passing.
  4. Memorize the high-yield facts: signal words, first aid, PPE rules, drift and inversions, and basic calibration math.

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