Restricted-Use, State-Limited-Use, and Regulated Herbicides

Three labels of control

The Texas exam expects you to separate three related but different concepts: restricted-use pesticide, state-limited-use pesticide, and regulated herbicide. They all limit who may buy, distribute, or apply a product, but they come from different authorities.

A restricted-use pesticide, or RUP, is an EPA classification under FIFRA. EPA uses it when a product or a particular use could cause unreasonable adverse effects without extra controls. RUPs are not available to the general public and may be used only by certified applicators or persons under direct supervision when allowed.

A state-limited-use pesticide, or SLU, is designated by TDA. Texas uses this classification for products or uses with a high potential to harm people, animals, the environment, or non-target sites. A product can be general-use federally and still become SLU under Texas rules for a specific use.

A regulated herbicide is also designated by TDA. These herbicides need extra restrictions to prevent drift or uncontrolled application from damaging desirable vegetation. Regulated herbicide rules matter especially in counties with susceptible crops, grapes, cotton, specialty crops, and other drift-sensitive settings.

How the classifications compare

TDA's pesticide-classification page says general-use pesticides may be bought and used by the public and do not require a license for personal use on an individual's property. That does not mean every use is unregulated. Commercial horticultural applications and Texas SLU classifications can still require a license.

For exam scenarios, product classification and label compliance travel together. A product may be federally general-use, Texas state-limited-use, and still have label directions that control rate, site, personal protective equipment, restricted-entry interval, and disposal. The license permits legal access; it never authorizes label misuse.

State-limited-use triggers

Texas lists active ingredients that make products state-limited-use when the product is not covered by an exemption. Examples include 2,4-D, 2,4-DB, 2,4-DP, MCPA, dicamba, propanil, bromacil, prometon, quinclorac, sodium fluoroacetate, and sodium cyanide.

Texas also classifies some products by use. A pesticide product otherwise classified as general use becomes state-limited-use when applied by aerial application or power-driven fogging equipment for wide-area public health pest control. Texas separately lists a product containing warfarin when used only as a feral hog toxicant.

Exemptions matter. TDA lists exemptions for small containers, including liquid products at one quart or less and dry or solid products at two pounds or less, and for some specialty fertilizer mixtures labeled for ornamental use. Read the product, container size, and use before deciding.

Regulated herbicides

TDA's regulated herbicide list includes 2,4-D, MCPA, dicamba, and quinclorac. The point is not that these active ingredients are always forbidden. The point is that Texas adds restrictions in regulated counties because off-target movement can damage desirable vegetation.

Restrictions apply only in regulated herbicide counties unless a special provision says otherwise. TDA's county list is long and includes county-specific provisions. On the exam, expect the rule principle rather than memorization of every county.

General regulated-county procedures include several high-value test rules:

• Do not apply regulated herbicides in a regulated county without first obtaining a spray permit unless an exemption applies.
• Do not spray regulated herbicides when wind exceeds 10 miles per hour, or when the product label is more restrictive.
• Do not use turbine or blower-type ground application equipment for regulated herbicides.
• Do not spray highly volatile herbicides when susceptible crops are within a four-mile radius.
• Include the herbicide spray permit number in the application record when a permit is required.

Some county provisions are stricter by date, formulation, or method. For example, a county may prohibit aerial application during a regulated period or restrict ester formulations. Always apply the most restrictive applicable rule: label, Texas statewide rule, county provision, or permit condition.

Do not assume a permit fixes a bad application. If the label prohibits application at a wind speed, near a sensitive site, or by a method, the permit does not override it. If the county rule is stricter than the label, the county rule controls inside that regulated county.

Buyer, dealer, and applicator duties

Texas requires a current pesticide applicator license or certificate to purchase and use a product designated as state-limited-use and regulated herbicide. A person may not purchase or use a regulated herbicide unless licensed or working under direct supervision of a licensed applicator.

Distribution is also controlled. A person who distributes state-limited-use pesticides, restricted-use pesticides, or regulated herbicides must have the appropriate TDA pesticide dealer license. Dealers must keep distribution records for two years. Applicators must keep application records for two years.

Exam reasoning pattern

When a question names a product, ask three questions. First, is it federally restricted-use? Second, has Texas classified it as state-limited-use by active ingredient, device, or public-health use? Third, is it a regulated herbicide in a regulated county?

Then add the label. FIFRA and Texas law do not let an applicator replace label restrictions with state licensing. The label may be stricter on wind, buffer distance, personal protective equipment, timing, crop site, or application method. The most restrictive applicable requirement is the safest exam answer.