WY Pesticide Applicator cheat sheet

FIFRA makes it unlawful to use a registered pesticide in a manner inconsistent with its labeling; EPA registers products, and states may impose stricter requirements.

The Wyoming Department of Agriculture (WDA) is the state lead agency for pesticide registration, applicator certification and licensing, and enforcement; EPA Region 8 covers Wyoming.

Wyoming issues private applicator certification (application on land the applicator owns or rents for agricultural production) and commercial applicator licenses (application for hire), plus dealer licenses.

Restricted-use pesticides may be applied only by a certified applicator or by a noncertified person working under the direct supervision of a certified applicator.

A Section 24(c) special local need registration is issued by WDA with EPA approval and is valid only in Wyoming, only for the specific site and pest named on the supplemental label.

Wyoming's Weed and Pest Control Act authorizes county weed and pest districts to require control of designated noxious weeds; landowners are responsible for controlling designated species on their property.

Certified applicators must keep restricted-use pesticide application records for 2 years, including product name, EPA registration number, amount, site, date, and applicator name.

Wyoming pesticide dealers must be licensed to sell restricted-use pesticides and must retain records of restricted-use pesticide sales for 2 years.

Violations can result in civil penalties, suspension or revocation of certification or license, stop-sale orders, and criminal prosecution.

Signal word hierarchy by acute toxicity: Category I is DANGER (DANGER-POISON plus skull and crossbones when oral LD50 is 50 mg/kg or less), Category II is WARNING, Categories III and IV are CAUTION.

The label's ingredient statement lists each active ingredient by name and percentage plus the total inert ingredients; the EPA registration number identifies the registered product.

The Directions for Use section is enforceable federal law; rates, sites, timing, PPE, and restrictions on that section carry the same legal weight as the rest of the label.

The restricted-entry interval (REI) states the minimum time after application before workers may enter without label-specified PPE; some labels prohibit early entry entirely.

A Safety Data Sheet has 16 sections: Section 2 hazard identification, Section 4 first aid, Section 5 firefighting, Section 6 accidental release, Section 7 handling and storage, Section 8 exposure controls and PPE.

SDS Section 9 gives physical and chemical properties (pH, flash point, solubility, vapor pressure) used to evaluate volatility, compatibility, and storage hazards.

When label and SDS differ on PPE, follow the more protective requirement; the SDS does not replace the label's directions for use.

Worker Protection Standard labels require the agricultural employer to provide decontamination supplies and, where the label specifies, oral warnings or posted warning signs before the REI expires.

Chemigation labeling requires fail-safe backflow prevention and normally prohibits application when wind could carry spray to adjacent sites.

IPM sequence: correctly identify the pest, monitor and record populations, compare counts to a threshold, select the least-risk effective tactic, then evaluate results.

The economic injury level is the pest density at which crop loss equals the cost of control; the action (treatment) threshold is set at or below that level to trigger control in time.

Resistance management rotates among mode-of-action groups (IRAC for insecticides, HRAC for herbicides, FRAC for fungicides) and avoids repeated use of a single group on the same population.

Grass weeds are identified by hollow round stems, parallel leaf veins, ligules, and auricles; broadleaf weeds by netted veins, two cotyledons, and a growing point at the stem tip.

Complete metamorphosis is egg-larva-pupa-adult; incomplete metamorphosis is egg-nymph-adult. The stage present determines which control tactic and rate will work.

The disease triangle requires a susceptible host, a virulent pathogen, and favorable environment; sanitation, resistant varieties, and moisture management break one leg of the triangle.

Wyoming designated noxious weeds include Canada thistle, leafy spurge, spotted knapweed, Russian knapweed, Dalmatian toadflax, and saltcedar; county districts may mandate their control.

Scouting uses a systematic pattern (W, M, or zigzag walk) with samples at multiple field locations, and records are kept to compare population trends over time.

A secondary pest outbreak follows broad-spectrum insecticide use that destroys natural enemies, allowing mites or aphids to flare above the original pest's density.

Emulsifiable concentrates contain active ingredient, organic solvent, and emulsifier; mixed with water they form a milky emulsion that can injure foliage and soften plastic or painted surfaces.

Wettable powders form a suspension that settles, requires continuous agitation, and leaves visible residue that may reduce crop marketability; water-dispersible granules are low-dust alternatives.

Flowable (F or L) formulations are liquid suspensions of solid particles that settle and require agitation; freezing can permanently damage them.

True solutions (S, SL, SP) dissolve completely in water and need little agitation once mixed, but some are corrosive to sprayer parts.

Microencapsulated formulations release active ingredient slowly, which can extend residual hazard to bees and other nontarget organisms.

Fumigants are volatile by design and require a sealed enclosure, buffer zones, posting, and specialized PPE and application equipment.

Standard tank-mix order (WALES): wettable powders, then flowables, then emulsifiable concentrates, then solutions, with surfactants added last and agitation maintained throughout.

A jar test using the actual carrier water and the intended products checks compatibility before a full tank is mixed; flocculation, heavy sediment, oil separation, or heat indicate incompatibility.

High-pH water causes alkaline hydrolysis of some pesticides; a buffering agent lowers pH and extends the tank life of susceptible products.

Label PPE is the legal minimum; select chemical-resistant materials such as nitrile, butyl, neoprene, or PVC, and never use leather or cloth gloves for pesticide handling.

Toxicity signal words drive PPE level: DANGER products generally require the most protective coveralls, gloves, footwear, eyewear, and respiratory protection; CAUTION products the least.

A tight-fitting respirator requires a medical evaluation before use, an annual fit test, a cartridge change schedule, and storage in a sealed container away from the work area.

Mixers and loaders face the highest exposure and should wear a chemical-resistant apron in addition to the label-required body protection.

Work clothing contaminated with concentrate is discarded rather than laundered; reusable work clothing is washed separately from family laundry.

Organophosphate and carbamate poisoning signs include headache, sweating, salivation, blurred vision, muscle twitching, and pinpoint pupils; cholinesterase monitoring detects overexposure early.

Decontamination for skin contact uses soap and water only (never solvents or harsh cleansers); eye exposure requires flushing with clean water for at least 15 minutes.

The Worker Protection Standard requires decontamination supplies (water, soap, towels) within one-quarter mile of workers and handlers, with a minimum volume of water specified by the rule.

Do not enter a treated area before the REI expires; early-entry workers must wear the label-specified PPE, and some labels prohibit early entry under any circumstances.

Broadcast boom calibration formula: gallons per acre = (nozzle flow in gallons per minute x 5940) divided by (speed in mph x nozzle spacing in inches).

Nozzle flow varies with the square root of pressure, so quadrupling pressure doubles flow, while doubling pressure increases flow by only about 1.41 times.

The 1/128-acre method: 1/128 acre is 340.3 square feet, so course length equals 340.3 divided by swath width in feet; ounces collected per nozzle over that course equals gallons per acre.

To convert a broadcast rate to a band rate, multiply the broadcast gallons per acre by the band width and divide by the row spacing, both in the same units.

Replace worn nozzles when flow deviates more than 10 percent from the catalog rating; worn tips cause uneven patterns and misapplication.

Flat-fan nozzles are spaced for about 50 percent pattern overlap; 80-degree tips run about 18 to 20 inches above the target, and 110-degree tips run lower.

Speed and gallons per acre are inversely related: increasing speed at fixed nozzle flow reduces gallons per acre, so recalibrate whenever speed or nozzle set changes.

Drift-reduction techniques include larger-droplet nozzles, lower spray pressure, lower boom height, and spraying only within the label's wind and temperature limits.

Clean the sprayer with a triple rinse between products, and use a separate or thoroughly cleaned system when switching between herbicide groups and sensitive crops.

Particle drift is droplet movement during application and is reduced by nozzle choice, pressure, and boom height; vapor drift comes from volatilization after deposition and depends on product volatility and temperature.

Do not spray during a temperature inversion, when air temperature rises with height and small droplets remain suspended and move laterally far from the target.

Avoid applications when wind is gusty or above label limits; light, steady wind with the right direction and buffer is preferable to dead calm, which signals inversion risk.

Leaching risk increases with high water solubility, low soil organic carbon adsorption (Koc), long soil half-life, and sandy, low-organic-matter soils.

Runoff risk rises when heavy rain follows application; follow label rainfall restrictions and avoid applying to saturated or frozen ground or near surface water.

Observe label buffer zones and setbacks from wells, streams, ponds, and sensitive sites, and check endangered species bulletins for county-specific restrictions.

Protect pollinators by avoiding applications to blooming crops or weeds when bees are foraging; many labels require evening application or specify a bee advisory.

Point-source contamination from mixing and loading is prevented with an air gap or check valve (backflow prevention) and by rinsing on a contained pad or in the field.

Herbicide carryover injury to rotational crops is prevented by respecting the label's rotational interval and plant-back restrictions, which lengthen as rate and soil persistence increase.

Store pesticides in their original labeled containers in a locked, dry, ventilated area, separate from food, feed, seed, and livestock, with absorbent materials and a spill kit on hand.

Liquid pesticides are kept in secondary containment and off the floor, and storage areas have no floor drain that could carry a release to a sewer or waterway.

Transport pesticides upright and secured, never in the passenger compartment or with food or feed, and carry the shipping papers and placards required by DOT for the hazard class.

Many pesticide products ship as DOT Class 6.1 (toxic) or Class 9 (miscellaneous hazardous material); the SDS and shipping papers identify the class and required placards.

Spill response sequence: protect people, stop the source, contain the release, protect drains and water, absorb the material, then clean up, decontaminate, and notify authorities.

Releases of a hazardous substance at or above its CERCLA reportable quantity must be reported to the National Response Center at 1-800-424-8802, in addition to state and local notifications.

Triple rinse a pesticide container by filling it about one-quarter full, closing and shaking, then pouring the rinse water into the spray tank, repeating three times.

Pressure rinsing with a special nozzle is an acceptable alternative to triple rinsing; rinsed containers are disposed of or recycled according to the label and state rules.

Excess or unusable pesticide is disposed of by applying it at the labeled rate and site when legal, or through a licensed hazardous waste handler; it is never dumped down a drain or on the ground.