Pesticide Applicator Exam Cheat Sheet

Who must be certified (EPA)

Source: EPA Certification Standards for Pesticide Applicators and 40 CFR 171 (checked October 2026).

• Anyone who applies or supervises the use of restricted use pesticides (RUPs) must be certified. States, territories and tribes do the certifying, and you need certification in each state where you apply RUPs.
• Federal minimum age: 18 for certified applicators and for people using RUPs under direct supervision (16 allowed on a family-owned farm supervised by an immediate-family private applicator).
• Maximum recertification interval: 5 years (states may set shorter).
• Fumigation and aerial application require additional application-method certification.
• Noncertified applicators must be trained before using RUPs under direct supervision.

Signal words and toxicity categories

Signal words reflect acute toxicity (40 CFR 156.62 and 156.64). Lower LD50 = more toxic.

• Category I — DANGER (plus POISON and skull and crossbones when based on oral, dermal or inhalation toxicity). Oral LD50 up to 50 mg/kg.
• Category II — WARNING. Oral LD50 over 50 to 500 mg/kg.
• Category III — CAUTION. Oral LD50 over 500 to 5,000 mg/kg.
• Category IV — no signal word required; if one is used, CAUTION. Oral LD50 over 5,000 mg/kg.
• LD50 = milligrams of toxicant per kilogram of body weight that kills half of a test population.

Reading the label

The label is the law: using a pesticide in a manner inconsistent with its labeling violates FIFRA.

• Front panel: product name, RESTRICTED USE statement if applicable, ingredient statement, signal word, Keep Out of Reach of Children, EPA Registration No. and Establishment No.
• Precautionary statements: hazards to humans and domestic animals (with required PPE), environmental hazards, physical/chemical hazards.
• Directions for use, Agricultural Use Requirements (REI and WPS PPE), and Storage and Disposal.
• Mandatory language: must, shall, do not. Advisory language: should, recommended, for best results.

REI vs PHI

Two different clocks after an application.

• REI (restricted-entry interval): how long workers must stay out of the treated area. Protects workers.
• PHI (preharvest interval): minimum time between the last application and harvest. Keeps residues within legal tolerances; protects consumers.

Safety and PPE

Risk = toxicity × exposure. Skin contact is the most common route of exposure.

• Label PPE is the legal minimum. Use unlined chemical-resistant gloves; never cotton or leather.
• Wash pesticide clothing separately from family laundry; discard clothing drenched with a DANGER concentrate.
• Eyes: flush with clean water for at least 15 minutes. Skin: remove clothing, wash with soap and water. Take the label to the doctor.
• Organophosphate/carbamate poisoning signs: pinpoint pupils, salivation, sweating, twitching.

Protecting the environment

Drift, leaching and runoff.

• Reduce drift with larger droplets, lower pressure, lower boom height and light, steady wind away from sensitive areas. Avoid temperature inversions.
• Leaching risk is highest with sandy, low-organic soils, shallow water tables, and pesticides that are soluble, persistent and weakly adsorbed.
• Prevent back-siphoning with an air gap or check valve; mix and load away from wells.

Spills, storage, transport and disposal

Know the order of operations.

• Spills: Control, Contain, Clean up. Absorb liquids with cat litter or clay; never hose into drains.
• Store in original labeled containers in a locked, ventilated area away from food, feed and water.
• Transport in the truck bed or a locked compartment, never in the cab.
• Triple rinse (or pressure rinse) empty containers and add rinsate to the spray tank. Use leftover mix on a labeled site at or below label rate.

IPM and pesticide laws

Integrated pest management and the federal framework.

• IPM: identify the pest, monitor, use action thresholds, and combine cultural, biological, mechanical and chemical controls.
• Delay resistance by rotating modes of action.
• FIFRA governs registration, sale, distribution and use; EPA administers it and states enforce use.
• FIFRA 2(ee) allows a lower rate, a pest not on the label (if the site is listed), and any method not prohibited. Section 24(c) = special local need registration; Section 18 = emergency exemption.

Official sources

• EPA — Certification Standards for Pesticide Applicators
• EPA — How to Get Certified as a Pesticide Applicator
• eCFR — 40 CFR Part 171