Pesticide Applicator Core Study Guide

Who Needs Certification

Anyone who uses or supervises the use of a restricted use pesticide (RUP) must be a certified applicator, or work under the direct supervision of one. States run certification under EPA-approved plans; the federal minimums are in 40 CFR Part 171. A certified applicator must be at least 18 years old (171.103), and certification lasts no more than 5 years before renewal (171.107).

Noncertified Applicators Under Supervision

• A noncertified person using RUPs under supervision must generally be at least 18, or 16 when working for a family member who is a private applicator (171.201).
• They need training, including instruction on the equipment they will use, within the previous 12 months.

Reading the Label

• The label is the law: using a product in a way inconsistent with its labeling is a violation.
• Signal words follow the 156.62 toxicity table. Category I products carry DANGER (with POISON and the skull and crossbones when toxicity is from oral, dermal or inhalation exposure); Category I limits include oral LD50 of 50 mg/kg or less, dermal 200 mg/kg or less, and inhalation 0.2 mg/L or less.
• Category II uses WARNING, Category III uses CAUTION, and Category IV needs no signal word (CAUTION is optional).
• Every label must say "Keep Out of Reach of Children" (156.66), and carry first-aid and precautionary statements (156.68, 156.70).
• Physical hazard statements: a flash point at or below 20 °F is Extremely Flammable; 80–150 °F is Combustible for non-pressurised products (156.78).

The Worker Protection Standard

• The restricted-entry interval (REI) is the time after application when workers may not enter a treated area, with narrow early-entry exceptions.
• The application exclusion zone extends 100 feet for aerial, air blast, fumigant, smoke, mist and fog applications and fine sprays (droplets smaller than medium), and 25 feet for sprays with droplets from medium size upward when sprayed more than 12 inches above the planting medium.
• Treated areas must be posted when the REI is over 48 hours outdoors or over 4 hours in enclosed spaces. Signs go up no more than 24 hours before application and come down within 3 days after the REI ends.
• Handlers must be 18 or older and trained within the last 12 months. Handlers applying skull-and-crossbones products must be monitored at least every 2 hours, and at least 3 gallons of water per handler must be available for decontamination.

Containers and Rinsing

Triple rinsing a non-refillable container means filling it about one-quarter full of water, shaking for 10 seconds and draining for 10 seconds after flow begins to drip, three times (156.146). Never reuse a non-refillable container for any other purpose.

How to Practise

Start with the adaptive practice test, then take the full mock exam under timed conditions. Your state's core manual is the main study source, so read it alongside this guide.

Frequently Asked Questions

Who gives the pesticide core exam?

Your state pesticide lead agency (often the department of agriculture) certifies applicators under an EPA-approved state plan. The federal rules in 40 CFR Part 171 set minimum standards, and each state sets its own exam length and pass mark.

How old must a certified applicator be?

Under 40 CFR 171.103, a certified applicator must be at least 18 years old.

How long does certification last?

Under 40 CFR 171.107, a state certification must be renewed at least every 5 years, by exam or continuing education.

Is the federal core exam closed book?

40 CFR 171.103 requires commercial certification exams to be written and proctored; states set the specific rules for reference material.