2.3 Restricted-Use Classification & Special State/Federal Registrations

Restricted-Use Classification & Special State/Federal Registrations

Core Regulatory Principle: Pesticides are divided into two fundamental regulatory classifications under federal law: General Use Pesticides (GUP) and Restricted-Use Pesticides (RUP). When a chemical's acute toxicity, oncogenicity, environmental persistence, or potential to contaminate groundwater presents significant hazards that cannot be controlled through label instructions alone, the EPA designates the product as Restricted-Use. Furthermore, federal statutes establish flexible, specialized registration mechanisms (Sections 3, 24(c), 18, and 5) that allow state and federal authorities to respond to unique local pest emergencies, minor crop needs, and experimental research.

---

General Use vs. Restricted-Use Pesticides (RUP)

Under FIFRA Section 3(d) (codified at 7 U.S.C. § 136a(d)), the EPA evaluates the potential for unreasonable adverse effects on humans and the environment, classifying every registered pesticide product into one of two tiers:

                                  PESTICIDE CLASSIFICATION
                                             │
                    ┌────────────────────────┴────────────────────────┐
                    ▼                                                 ▼
        GENERAL USE PESTICIDES (GUP)                      RESTRICTED USE PESTICIDES (RUP)
   ┌─────────────────────────────────────┐           ┌─────────────────────────────────────┐
   │ • Low to moderate acute toxicity    │           │ • High acute mammalian toxicity     │
   │ • Minimal environmental persistence │           │ • Oncogenic or teratogenic risks    │
   │ • Available for retail purchase by  │           │ • High soil leaching / aquifer risk │
   │   the general public                │           │ • Extreme ecotoxicity / drift risk  │
   │ • No special certification required │           │ • Must be purchased & used ONLY by  │
   │   for residential home/garden use   │           │   or under certified applicator     │
   └─────────────────────────────────────┘           │   supervision                       │
                                                     └─────────────────────────────────────┘

Statutory Criteria for Restricted-Use Classification

The formal criteria for RUP classification are established in the Code of Federal Regulations (40 CFR § 152.170). For commercial and agricultural (non-residential) uses, a pesticide is considered for restricted-use classification if it meets any of the following hazard triggers:

1. Human Acute Toxicity Triggers:

   • Acute Oral $LD_{50} \le 50\text{ mg/kg}$ as formulated.
   • Acute Dermal $LD_{50} \le 200\text{ mg/kg}$ as formulated.
   • Acute Inhalation $LC_{50} \le 0.05\text{ mg/L}$ (4-hour exposure).
   • Causes irreversible eye damage (corneal opacity persisting more than 21 days) or severe dermal corrosion.

2. Subchronic, Chronic, or Delayed Toxicity Hazards:

   • Exhibits oncogenic (carcinogenic) potential in laboratory bioassays.
   • Causes teratogenic (fetal malformation/birth defect) or mutagenic effects.
   • Induces delayed neurotoxicity or reproductive impairment over extended exposure.

3. Groundwater and Aquifer Leaching Vulnerability:

   • Demonstrates high water solubility combined with low soil organic carbon sorption ($K_{oc} < 300\text{ mL/g}$) and high environmental persistence ($t_{1/2} > 30\text{ days}$ in soil or water), creating high contamination potential for drinking water aquifers.

4. Non-Target Ecological Hazards:

   • Leaves acute residues at or above one-fifth (1/5) of the acute oral or dietary $LC_{50}$ for exposed mammalian or avian wildlife.
   • Leaves residues at or above one-tenth (1/10) of the acute aquatic $LC_{50}$ for non-target fish and aquatic organisms.
   • Granular formulations presenting acute avian or mammalian toxicity ($LD_{50} \le 50\text{ mg/kg}$) applied where ground-feeding birds (e.g., quail, doves) mistake granules for grit.

The Mandatory Front-Panel RUP Identification Box

Every container of a Restricted-Use Pesticide must feature a prominent, black-bordered box placed at the very top of the primary front label panel. Federal law strictly dictates the layout and wording of this box:

┌─────────────────────────────────────────────────────────────────────────────┐
│                           RESTRICTED USE PESTICIDE                          │
│               Due to Acute Toxicity and Groundwater Leaching Concerns       │
│ For retail sale to and use only by Certified Applicators or persons under   │
│ their direct supervision and only for those uses covered by the Certified   │
│ Applicator's certification.                                                 │
└─────────────────────────────────────────────────────────────────────────────┘

---

Certified Applicator Requirements & Direct Supervision Standards

Federal law and the New Mexico Pesticide Control Act establish that Restricted-Use Pesticides can only be purchased and applied by a Certified Applicator or by individuals working under a certified applicator's direct supervision.

Certification Classifications in New Mexico

Administered by the NMDA under 21.17.50 NMAC, applicator certifications fall into two primary groups:

1. Private Applicators: Agricultural producers who use or supervise the use of RUPs for the purpose of producing agricultural commodities (crops, livestock, timber) on property owned, rented, or leased by them or their employer.
2. Commercial Applicators: Individuals who apply pesticides (general or restricted-use) to the land or property of another for direct compensation, or public employees (government applicators) who apply pesticides in the execution of their official public duties.

Category Match Requirement: A certified applicator's authority is strictly bounded by their verified certification categories. A commercial applicator certified solely in Category 3A (Ornamental & Turf) is legally prohibited from purchasing or applying an RUP registered strictly for Category 1A (Agricultural Plant) or Category 7A (Structural Pest Control).

Direct Supervision Standards: Federal vs. High-Hazard Labels

Under FIFRA Section 2(e)(4) and NMDA rules, an uncertified handler may handle, mix, and apply an RUP provided they are acting under the "direct supervision" of a licensed certified applicator. However, the exact legal meaning of direct supervision depends on label directives:

                      LEVELS OF DIRECT SUPERVISION
                                   │
       ┌───────────────────────────┴───────────────────────────┐
       ▼                                                       ▼
STANDARD DIRECT SUPERVISION                             HIGH-HAZARD ON-SITE SUPERVISION
• Certified applicator accessible via phone/radio       • Certified applicator PHYSICALLY PRESENT on site
• Detailed written site & safety instructions provided  • Mandated on specific labels (soil fumigants, RUPs)
• PPE & emergency wash supplies on site                 • Continuous visual contact with handlers
• Applicator is within reasonable travel distance       • Handlers cannot operate alone

• Standard Supervision: Unless the label states otherwise, the certified applicator is not required to be physically present at the exact application site at the moment of chemical release. However, the certified applicator must provide verifiable job-specific instructions, ensure all required PPE and application equipment are functioning, ensure emergency decontamination materials are on site, and remain accessible by two-way radio, cellular telephone, or direct communication within a reasonable physical response distance.
• High-Hazard On-Site Supervision: Highly toxic chemicals—particularly soil fumigants (e.g., metam sodium, chloropicrin) and structural fumigants (e.g., sulfuryl fluoride, aluminum phosphide)—bear specific label mandates: "The certified applicator must be physically present at the treatment site at all times during application, tarp sealing, and aeration." In these instances, off-site telephone availability is a federal violation.
• Legal Liability: In all cases, the certified applicator bears ultimate legal liability for any misapplication, chemical drift, Worker Protection Standard violation, or environmental contamination committed by uncertified personnel operating under their direction.

---

Pesticide Dealer Licensing, Verification & Recordkeeping in New Mexico

Because Restricted-Use Pesticides present severe hazards, their commercial distribution is strictly monitored. The New Mexico Pesticide Control Act imposes rigorous statutory mandates on pesticide dealers who distribute RUPs within the state.

1. RUP Dealer Licensing

Any commercial establishment, retail warehouse, agricultural cooperative, or independent sales representative that sells, distributes, or offers for sale Restricted-Use Pesticides in New Mexico must obtain an annual Pesticide Dealer License from the New Mexico Department of Agriculture. Operating without an active dealer license constitutes an administrative and criminal misdemeanor.

2. Mandatory Verification of Purchaser Credentials

Before releasing an RUP, a licensed dealer must perform a rigorous credential audit:

• Inspection of Physical or Electronic Credential: The dealer must verify that the purchaser possesses an active, unexpired certified applicator license issued by the NMDA (or an approved reciprocal state agency).
• Category Verification: The dealer must confirm that the applicator's certification categories match the labeled use of the product being purchased.
• Authorized Agent Verification: If an uncertified employee or farmhand arrives to pick up an RUP on behalf of a certified applicator, the dealer must possess a valid, signed Authorized Agent Form on file from the certified applicator designating that specific individual to receive the product. The dealer must verify the agent's photo identification.

3. Mandatory RUP Sales Recordkeeping

Under 21.17.50 NMAC, New Mexico RUP dealers must document every individual transaction and maintain an official RUP Sales Register containing the following seven mandatory data elements:

1. Date of sale, distribution, or delivery.
2. Full legal name and physical address of the certified applicator.
3. Certified applicator's license number, expiration date, and verified certification categories.
4. Name of authorized agent receiving the product (if applicable).
5. Complete brand / trade name of the product and its official EPA Registration Number.
6. Total quantity of product sold, including container sizes and formulation units.
7. Target crop, commodity, or intended application site stated by the purchaser.

Retention Period: New Mexico law mandates that all RUP dealer sales records must be retained for a minimum of two (2) years from the date of distribution. Records must be kept organized and immediately accessible for inspection and copying by NMDA regulatory inspectors upon request.

---

Special Registrations & Permits Under FIFRA

While the majority of agricultural chemicals enter the commercial market via standard national registration, FIFRA establishes four distinct statutory registration and permit pathways to address unique geographic, emergency, or research circumstances:

                      FIFRA REGISTRATION & PERMIT PATHWAYS
                                        │
  ┌───────────────────┬─────────────────┴─────────────────┬───────────────────┐
  ▼                   ▼                                   ▼                   ▼
SECTION 3           SECTION 24(c)                       SECTION 18          SECTION 5
Standard National   Special Local Need (SLN)            Emergency           Experimental Use
Registration        Issued by NMDA for State Needs      Exemption           Permit (EUP)
• Standard pathway  • Supplements Section 3 label       • Unregistered uses • Field research trials
• Nationwide scope  • Valid ONLY in state               • Urgent crisis     • Unregistered chem
• Comprehensive     • MUST have SLN label on site       • 4 distinct tiers  • Destroy treated crops

1. Section 3: Standard National Registration

FIFRA Section 3 is the standard commercial registration pathway under which the vast majority of agricultural and industrial pesticides enter interstate commerce. The chemical manufacturer (registrant) submits exhaustive data packages to the EPA covering:

• Mammalian acute, subchronic, and chronic toxicology.
• Environmental fate, soil degradation, and groundwater leaching modeling.
• Residue chemistry to establish food tolerances under the FQPA.
• Ecological toxicity to birds, fish, beneficial insects, and non-target plants.
• Section 3 registrations have nationwide validity and establish the EPA Master Label.

2. Section 24(c): Special Local Need (SLN) Registrations

Authorized under FIFRA Section 24(c) (7 U.S.C. § 136v(c)), Special Local Need registrations allow states—through the NMDA—to register additional uses of a federally registered pesticide to address regional agricultural or ecological conditions:

• Triggering Conditions: An SLN is issued when a state agricultural industry faces a localized pest problem, regional weather anomaly, or niche crop vulnerability (e.g., specialty chile peppers, pecans, or onions in New Mexico) for which no federally registered pesticide provides adequate, economical control.
• Scope of Authorization: An SLN can authorize new application sites or crops, different application timings, increased dosage rates (if supported by tolerance data), or specialized application techniques.
• Supplemental Labeling Requirement: A Section 24(c) registration generates an official SLN Supplemental Label bearing an SLN number (e.g., EPA SLN No. NM-240001).
• Mandatory On-Site Possession: The applicator MUST have the official Section 24(c) SLN supplemental label in their physical possession at the application site at the time of mixing, loading, and application. Applying under an SLN registration without the physical SLN label present on site constitutes an illegal misuse violation under FIFRA Section 12.

3. Section 18: Emergency Exemptions

Authorized under FIFRA Section 18 (7 U.S.C. § 136p; 40 CFR Part 166), emergency exemptions allow the temporary use of an unregistered pesticide (or an unregistered use of a registered chemical) to address sudden, urgent pest situations where no registered alternatives are available and significant economic or human health harm would occur. There are four distinct types of Section 18 exemptions:

Exam Scenario: A foreign lepidopteran pest suddenly infests New Mexico chile fields in Luna and Doña Ana counties. No federally registered pesticide is effective, and the crop will be destroyed within days — there is not time to request a Specific Exemption. NMDA notifies EPA in advance of invoking the crisis provisions (supplying the product name, active ingredient, EPA registration, use site, use pattern, start and end dates, expected residue level, earliest harvest date, and a description of the emergency), notifies the registrant at the same time, and issues a Section 18 Crisis Exemption authorizing local growers to treat. The exemption may run no more than 15 days unless NMDA submits a specific, quarantine, or public health exemption application in the meantime.

4. Section 5: Experimental Use Permits (EUP)

Authorized under FIFRA Section 5 (7 U.S.C. § 136c; 40 CFR Part 172), Experimental Use Permits enable agricultural chemical manufacturers, university research stations (e.g., New Mexico State University Agricultural Experiment Stations), and federal research bodies to conduct small-scale field trials on unregistered chemicals or new formulation uses:

• Data Generation: EUP trials gather real-world agronomic efficacy, environmental fate, and crop tolerance data required to support a future Section 3 registration petition.
• Food Safety Controls: Crops or livestock treated under an EUP cannot enter commercial human food or animal feed channels unless the EPA has established a formal temporary residue tolerance. In the absence of a temporary tolerance, all treated agricultural commodities must be destroyed by burning, deep plowing, or burial.