4.3 Directions for Use & Label Compliance

4.3 Directions for Use & Label Compliance

Quick Answer: The Directions for Use section is the part of the label that tells the applicator exactly how the product may be applied — rate, method, timing, target site, equipment, mixing/loading, REI, PHI, and maximum season limits. Under FIFRA, using a pesticide in a manner inconsistent with its labeling is a violation, with only narrow exceptions. The label, not the Safety Data Sheet, is the legal document.

The Directions for Use Section

The Directions for Use panel typically includes:

• Application rate — how much product per acre, per 100 gallons, per 1,000 sq ft, or per unit of animal.
• Application method — broadcast, band, foliar, soil-directed, chemigation, ultra-low-volume (ULV), bait station, etc.
• Timing — growth stage of the pest or crop, time of day, season, and weather conditions (e.g., "apply when wind speed is between 3 and 10 mph").
• Target sites and crops — the use-site list and crop list discussed in Section 4.1.
• Mixing and loading — order of addition, agitation requirements, adjuvants, carrier (water or oil), and spray-tank pH.
• Equipment — nozzle type, droplet size, sprayer calibration, and equipment cleanout.
• Re-entry Interval (REI) — when workers may re-enter without PPE.
• Pre-Harvest Interval (PHI) — the minimum days between application and harvest.
• Maximum rate and season limits — the most product allowed per acre per application and per season (cumulative cap).
• Tank-mix rules — what may or may not be mixed with the product.
• Restrictions — setbacks from water, schools, beehives, or sensitive sites; wind-speed ceilings; temperature limits.

Reading the Label Before Each Step

A useful mnemonic: read the label before you buy, mix, apply, store, or dispose. Each step has its own label questions, and the Directions for Use panel answers most of the application-side questions. The label also tells you what cannot be done — for example, a prohibition on aerial application, on application through irrigation equipment (chemigation), or on application when bees are actively foraging.

Pre-Harvest Interval (PHI)

The Pre-Harvest Interval is the minimum number of days between a pesticide application and harvest of the crop. The PHI is set to ensure that residues degrade below the legal tolerance by the time the crop reaches the consumer. Applying too close to harvest — even at the correct rate — produces an illegal residue, which is a violation enforced by EPA and, in Michigan, by MDARD. PHIs vary by crop and product: a label may set a 7-day PHI on apples and a 30-day PHI on grapes for the same product. Always read the PHI for your specific crop before applying.

Re-Entry Interval (REI)

The restricted-entry interval is the time after application during which workers may not enter the treated area without the early-entry PPE specified on the label. Under 40 CFR 156.208, the label REI for a WPS product is set by the most toxic active ingredient in it: 48 hours if any active ingredient is in Toxicity Category I, 24 hours for Category II, and 12 hours for everything else. Twelve hours is therefore the floor for a WPS-labeled product — there is no shorter default. Labels may extend the REI further for specific crops, activities, or arid regions.

Maximum Rates and Season Limits

Labels often set two caps:

1. Maximum single-application rate — the most product per acre (or other unit) per application.
2. Maximum seasonal rate — the most product per acre per full season or crop cycle.

These caps prevent over-application that leads to residues, crop injury, resistance, or environmental load. You may apply less than the maximum single rate, but you may never exceed it, and you may never exceed the seasonal cap regardless of how many applications you make.

Tank Mixes and Prohibitions

A tank mix is the combination of two or more pesticides (and sometimes adjuvants or fertilizers) in the same spray load. Labels handle tank mixes in one of three ways:

1. Explicitly permitted — the label lists the products that may be tank-mixed.
2. Silent — the label does not address tank mixes, in which case the applicator bears the legal risk for any incompatibility, crop injury, or efficacy failure.
3. Prohibited — the label explicitly forbids certain mix partners or all tank mixes.

Even where a label is silent, tank-mixing is generally tolerated only when every component is registered for the target use site. A common error is to mix two products registered for different crops and apply the mix to a third crop — that is use inconsistent with the labeling of both products.

"In a Manner Inconsistent with Its Labeling"

FIFRA Section 2(ee) defines "to use any registered pesticide in a manner inconsistent with its labeling" as a violation. The law spells out a narrow set of exceptions:

• Applying a pesticide at a lower dosage, concentration, or frequency than the label specifies.
• Applying a pesticide against a target pest not on the label, if the application site (crop, animal, or place) is on the label and the use pattern is otherwise consistent.
• Employing any method of application not prohibited by the label, provided the label does not specifically require a particular method.
• Mixing a pesticide with a fertilizer, unless the label prohibits it.

Critically, these exceptions never allow exceeding the label rate, the seasonal cap, the PHI, the REI, or the use-site list. They also do not allow using a product on a site that is not on the label.

Safety Data Sheet (SDS) vs. the Label

The Safety Data Sheet (SDS) is the OSHA-required hazard communication document for the product. The SDS has 16 standardized sections covering identification, hazards, composition, first aid, fire-fighting, accidental release, handling and storage, exposure control/PPE, physical/chemical properties, stability and reactivity, toxicology, ecological information, disposal, transport, and regulatory information.

The SDS provides more detail than the label on some hazards (chronic toxicity, ecotox, transport), but it is not a substitute for the label and is not the legal document for use directions. Always apply according to the label; consult the SDS for additional hazard and emergency response information.

Compliance as a Daily Practice

Label compliance is not a one-time read at purchase. Each application decision should be checked against the label:

1. Is the target site on the use-site list?
2. Is the application rate within the labeled range and below the seasonal cap?
3. Are wind speed, temperature, and setbacks within label limits?
4. Is the PHI long enough for the planned harvest date?
5. Is the REI posted and enforced for workers?
6. Is the PPE on the label being worn?
7. Is the tank mix explicitly permitted or not prohibited?

Failure on any of these is a violation enforceable by MDARD under Part 83 of NREPA and by EPA under FIFRA.

Official References

• FIFRA Section 2(ee) — definition of "use in a manner inconsistent with labeling."
• FIFRA Section 12(a)(2)(G) — unlawful acts.
• EPA Label Review Manual, Chapter 8 (Directions for Use) and Chapter 9 (Precautionary Statements).
• OSHA Hazard Communication Standard (29 CFR 1910.1200) — SDS requirements.
• MSU PSEP and MDARD — Michigan-specific label compliance training and enforcement.