Reading and Interpreting Pesticide Labels
Key Takeaways
- The product label and labeling identify legal sites, pests, rates, methods, restrictions, PPE, entry intervals, disposal, and emergency directions; state licensing never overrides them.
- The EPA registration number identifies a registered product, while the establishment number identifies the facility that produced the contents.
- The formulated product’s most severe acute endpoint determines its signal word: DANGER for Category I, WARNING for Category II, CAUTION for Category III, and no signal word required for Category IV.
- POISON and the skull-and-crossbones accompany DANGER when Category I results from acute oral, dermal, or inhalation toxicity; DANGER alone can reflect severe eye damage or skin corrosion.
- When exposure occurs, call 911 for a life-threatening emergency, contact Poison Control, and follow the label’s first-aid directions; do not improvise treatment.
Reading and Interpreting Pesticide Labels
A pesticide label is both an operating manual and an enforceable legal document. FIFRA makes it unlawful to use a registered pesticide in a manner inconsistent with its labeling. Read the entire label before purchase, before mixing, before application, and before storage or disposal. Recheck it whenever the product, site, rate, tank partner, weather, or task changes.
Product identity and federal numbers
The brand name identifies the marketed product; it does not prove that two similarly named products have the same ingredients or uses. The ingredient statement lists each active ingredient and its percentage and gives the combined percentage of other ingredients. The formulation and concentration determine how much product is needed.
The EPA registration number identifies the registered product and registrant. Supplemental distributor products may add a company number but remain tied to the base registration. The EPA establishment number identifies the facility where the contents were produced; it is useful in a recall but does not authorize a use. Net contents state how much product is in the package.
A restricted-use product displays a restricted-use statement near the top of the front panel. That statement identifies the reason for restriction and says the product is for retail sale to and use by certified applicators, or persons under their direct supervision, only for uses covered by the certification. Never infer restricted-use status from toxicity or brand reputation; read the label.
Signal words and acute toxicity
EPA assigns the signal word from the most severe result among five acute toxicity studies for the formulated product, with an additional methanol rule. The current pattern is:
| Acute category | Signal word |
|---|---|
| Category I | DANGER |
| Category II | WARNING |
| Category III | CAUTION |
| Category IV | None required; CAUTION may appear in limited circumstances allowed by EPA policy |
If Category I is based on acute oral, dermal, or inhalation toxicity, the label also bears POISON and the skull-and-crossbones. The word POISON is printed in red. DANGER without POISON can instead result from irreversible eye damage or skin corrosion. A skull-and-crossbones is not itself a numeric dose chart, and not every DANGER product has the POISON designation.
Signal words compare acute hazards of complete products. They do not measure chronic risk, environmental hazard, or exposure under a particular task. Risk depends on both toxicity and exposure. A lower-toxicity product can still cause injury if exposure is large, and a highly toxic product can be handled only by following every control on its label.
Precautionary and first-aid information
The Hazards to Humans and Domestic Animals portion identifies routes of exposure, symptoms or hazards, required PPE, engineering controls, and user-safety statements. The First Aid section gives product-specific actions for swallowing, skin contact, inhalation, or eye exposure and may list a note to medical personnel. In an emergency, protect yourself from contamination, stop exposure, call 911 when needed, call Poison Control at 1-800-222-1222, and have the container or label available. Never make a person vomit or give anything by mouth unless the current label and a medical professional or Poison Control direct it.
The Environmental Hazards section can address bees, fish, aquatic invertebrates, groundwater, drift, runoff, and endangered-species restrictions. The Physical or Chemical Hazards section covers hazards such as flammability, corrosivity, or incompatibility.
Directions for use
The Directions for Use state the legal sites and target pests, rates and concentrations, timing, application methods, maximum applications, seasonal maximums, preharvest intervals, restricted-entry intervals, buffers, spray quality, weather limits, and disposal directions. Agricultural products subject to the Worker Protection Standard include an Agricultural Use Requirements box. Nonagricultural directions may have different entry language.
Mandatory terms such as must, do not, shall, and may only establish requirements. Advisory language gives useful technique but cannot cancel a mandatory restriction. Read tables with their footnotes; a rate valid for one crop stage, soil, pest, or equipment type may be illegal elsewhere.
FIFRA Section 2(ee) allows certain uses that are not expressly written on the label, such as a lower dosage or frequency, control of an additional pest at an already-labeled site, or an application method the label does not prohibit. These exceptions do not permit a new site, disregard of a prohibition, or a use restricted by a state rule or a specific Section 2(ee) limitation. When uncertain, use the label, current supplemental labeling, and regulator guidance rather than guessing.
A pesticide product is in acute Toxicity Category IV for all endpoints. Which signal word is required by the current EPA pattern?
What does the EPA establishment number identify?
When does POISON and the skull-and-crossbones accompany DANGER?