Clopyralid Pyridine Carboxylate Range/Pasture Tank Selection

Clopyralid Pyridine Carboxylate Range and Pasture Herbicide — Bulk Tank Selection at Ag-Retailer Distribution, Range + Pasture Custom-Applicator Operations, Cereal-Grain + Sugarbeet + Canola Service, and Specialty-Crop Broadleaf Control

Clopyralid (CAS 1702-17-6 acid form; 57754-85-5 monoethanolamine salt; trade names Stinger HL at Corteva + Transline at Corteva + Reclaim at Corteva + Lontrel 360 SL at international + Curtail at Corteva [as clopyralid + 2,4-D premix] + post-patent generic Clopyralid 3 SL + Pyramid R&P + Spur 3 SL at multiple post-patent registrants) is a pyridine-carboxylic-acid-class systemic selective broadleaf herbicide registered at U.S. range + pasture (improved + native), small-grain (winter wheat + spring wheat + barley + oat + triticale), sugarbeet, canola, corn (specialty post-emergence), Christmas-tree plantation, conservation reserve, fallow + non-crop, and certain specialty applications for control of Asteraceae + Fabaceae + Polygonaceae broadleaves (Canada thistle; bull thistle; musk thistle; Russian thistle; sunflower; common ragweed; wild buckwheat; smartweed; vetch; sweetclover; locust; mesquite; clover; plus a wide spectrum of perennial + biennial broadleaf weeds). The active ingredient is supplied at 3-lb-acid-equivalent / gallon (3 SL formulation) or 2-lb-acid-equivalent / gallon (Stinger HL high-load formulation; 360 g a.e./L) aqueous soluble-liquid formulation at typical commercial product. Application timing is postemergence at 0.094-0.5 lb a.e. per acre depending on target weed + use site.

U.S. clopyralid consumption is concentrated at the High Plains + Northern Plains + Mountain West range + pasture management for Canada thistle + Russian thistle + bull thistle + musk thistle control + the Pacific Northwest + Northern Plains spring-wheat + winter-wheat + canola broadleaf control + the Red River Valley sugarbeet broadleaf control + the conservation-reserve + Christmas-tree plantation + non-crop weed control. Active U.S. registrants include Corteva Agriscience (Stinger HL + Transline + Reclaim + Curtail brand at Indianapolis IN; primary patent holder until clopyralid post-patent transition), plus post-patent generic supply at Albaugh, Drexel Chemical, Loveland Products (Helena Agri-Enterprises), ADAMA, FMC, and additional generic registrants. Bulk technical material is shipped at 2,500-gallon stainless tote + 250-gallon shuttle + 30-gallon drum + 2.5-gallon jug to U.S. ag-retailer + farmer-cooperative + custom-applicator stocking points. Storage envelope at ag-retail + co-op + custom-applicator + range-pasture distributor: 3-lb-a.e./gal Stinger HL aqueous soluble-liquid product is buffered at HDPE atmospheric tank in the 500-3,000 gallon range serving spring + early-summer + fall application windows.

The eight sections below cite EPA FIFRA registration framework for pyridine-carboxylate herbicides, Federal Insecticide Fungicide and Rodenticide Act 7 USC 136 et seq. labeling and tolerance compliance, EPA OPP Reregistration Eligibility Decision (RED) for clopyralid, OSHA Worker Protection Standard 40 CFR Part 170, EPA Pesticide Container Containment Rule 40 CFR Part 165 Subpart E, ASABE / ASAE S472 + S327 + S471 sprayer-calibration and application standards, EPA Endangered Species Act Bulletins Live framework, USDA NRCS conservation-practice standards (Code 595 Pest Management Conservation System), state-noxious-weed-board management programs (Montana, Wyoming, Idaho, Colorado, Nebraska, North Dakota, South Dakota, Kansas state-specific noxious-weed-management cost-share programs), ASTM D6692 + D6754 polyethylene tank specifications, and routine operating practice at North American ag-retail + custom-applicator + range-pasture-management clopyralid handling.

1. Material Compatibility Matrix

Formulated clopyralid 3-lb-a.e./gal Stinger HL or generic 3 SL product is a clear-to-pale-yellow aqueous soluble-liquid at pH 7.0-9.0 (monoethanolamine salt formulation), containing the active ingredient as the ethanolamine salt + surfactant + antifoam at typical formulation. The aqueous-soluble-liquid form has excellent material-compatibility with HDPE + standard elastomers + PVC + CPVC + stainless steel.

The dominant industrial pattern at North American ag-retailer + farmer-cooperative + custom-applicator + range-pasture-management-distributor clopyralid storage is HDPE rotomolded vertical atmospheric tank in the 500-3,000 gallon range with PVC + EPDM + Viton wetted plumbing + stainless-steel or PVC fittings + air-operated diaphragm transfer pump. OneSource Plastics' 5-brand HDPE network (Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, Bushman) is the standard atmospheric storage platform at ag-retail + co-op + range-pasture pyridine-carboxylate herbicide distribution.

2. Real-World Industrial Use Cases

High Plains + Northern Plains Range + Pasture Custom-Applicator Operations. Montana, Wyoming, Idaho, Colorado, Nebraska, North Dakota, South Dakota, Kansas, Oklahoma, Texas range-belt + pasture-management custom application services (county weed-control districts, BLM + USFS + state-trust-lands rangeland management contracts, plus private rangeland + pasture custom-applicator businesses) maintain 500-2,500 gallon HDPE day-tank stocking clopyralid at primary custom-applicator branch + nurse-truck mini-bulk + sprayer-tender + ATV-spot-treatment + airboat refill during the spring + early-summer + fall postemergence application window for Canada thistle + bull thistle + musk thistle + Russian thistle + leafy spurge spot + broadcast control.

Wheat-Belt + Canola Custom-Applicator Operations. Spring-wheat + winter-wheat + canola-belt custom applicator services (North Dakota, Montana, Minnesota, South Dakota, Idaho, Washington, Oregon, Kansas, Oklahoma, Texas, Colorado spring-wheat-belt + winter-wheat-belt; North Dakota + Minnesota + Montana + Idaho canola-belt) maintain 1,000-3,000 gallon HDPE day-tank stocking clopyralid at primary custom-applicator branch during the spring postemergence cereal + canola broadleaf control window.

Sugarbeet + Specialty-Crop Service. Red River Valley + Colorado + Idaho + Michigan + Nebraska sugarbeet production deploys clopyralid at postemergence broadleaf control with smaller-scale 500-2,000 gallon HDPE bulk + tote stocking at regional sugarbeet-belt ag-retail.

Non-Crop + Right-of-Way + Conservation-Reserve Service. Utility right-of-way + railroad right-of-way + highway right-of-way + state-park + national-park + national-forest + state-trust-lands non-crop weed-management deploys clopyralid at custom-applicator vegetation-management contractor + state + federal land-management agency operating 500-3,000 gallon HDPE day-tank at branch + nurse-truck reload service.

Christmas-Tree Plantation + Forestry-Adjacent Service. Pacific Northwest + Northeast Christmas-tree plantation production (Oregon, North Carolina, Pennsylvania, Michigan, Wisconsin, Vermont, New York, Maine plus regional Christmas-tree growers) deploys clopyralid at postemergence broadleaf control with 250-1,500 gallon HDPE bulk + tote stocking at regional Christmas-tree-belt ag-retail.

Bulk Pesticide Storage Facility State-DOA Compliance. Bulk pesticide storage triggers state-DEP + state-DOA pesticide-storage-permit requirements; HDPE atmospheric storage with engineered HDPE secondary-containment pan is the dominant compliance solution.

3. Regulatory Framework

EPA FIFRA Registration. Clopyralid was federally registered at EPA in 1987 (Dow AgroSciences, now Corteva Agriscience). Product labels detail use-rate, crop, geographic, and reentry specifications under FIFRA 7 USC 136 enforcement framework. Clopyralid is not a Restricted Use Pesticide at U.S. federal registration; some states impose state-specific restrictions at certain non-crop use categories due to compost-residual concerns (clopyralid persists in plant tissue + composted manure + grass-clipping compost; certain municipal-compost programs explicitly exclude clopyralid-treated lawn + turf clippings).

EPA OPP RED + Registration Review. EPA Office of Pesticide Programs published the clopyralid Reregistration Eligibility Decision (RED) framework + ongoing registration review at the FIFRA 15-year cycle. EPA + Corteva operate stewardship-program guidance addressing compost-residual + manure-residual carryover risk to sensitive non-target crops (legumes, tomato, potato, sunflower, lettuce, sugar beet, pea, bean), with explicit label statements requiring grazing-restriction + manure-management + compost-exclusion at clopyralid-treated forage.

40 CFR Part 165 Pesticide Container Containment Rule. EPA's bulk-pesticide-storage rule applies to clopyralid bulk + mini-bulk storage at 500-gallon-aggregate threshold, with secondary-containment + impervious-pad + spill-response + record-keeping requirements.

OSHA Worker Protection Standard 40 CFR Part 170. Reentry interval at treated fields is 12 hours under standard application; protective-equipment requirements at handler include long-sleeve shirt + long pants + chemical-resistant gloves (Viton, butyl, nitrile, or PTFE) + chemical-splash goggles + closed-toe footwear at mixing-loading + open-system handling.

EPA Endangered Species Act Bulletins Live. Clopyralid application is subject to county-by-county Endangered Species Act use limitations published at EPA's Bulletins Live! Two system; aquatic-species + critical-habitat restrictions apply at high-rate non-crop + range-pasture applications.

State-Noxious-Weed-Board Management Programs. Montana, Wyoming, Idaho, Colorado, Nebraska, North Dakota, South Dakota, Kansas, Washington, Oregon, plus several other Western U.S. states maintain state-noxious-weed-board cost-share programs supporting clopyralid + other selective-broadleaf-herbicide rangeland-management at county weed-control-district level.

USDA NRCS 595 Pest Management Conservation Practice. Federal cost-share + crop-insurance benefits at NRCS Conservation Practice Code 595 Pest Management Conservation System support IPM-based range + pasture management with clopyralid + alternative-active-ingredient rotations.

4. Storage System Specification

Bulk-Storage Tank. Clopyralid 3-lb-a.e./gal Stinger HL or generic 3 SL formulated product bulk storage at HDPE rotomolded 500-3,000 gallon scale: standard HDPE resin per ASTM D1248 specification; vertical flat-bottom or conical-bottom vessel; 4-inch ANSI flanged top fill or 3-inch threaded top at smaller sizes; 3-inch flanged bottom outlet with PVC or CPVC ball valve; atmospheric vent with insect-screen + dust-cover; 18-24-inch top manway for inspection + cleaning access; ultrasonic or radar level transmitter with high-high alarm + low-low alarm; sample valve at 12 inches above bottom outlet for QC sampling; HDPE bulkhead fittings at all penetrations rated for 1.20-1.25 SG (Stinger HL approx 1.22 SG) and 100 deg F maximum service temperature; UV-stabilized exterior at outdoor installations.

Compost-Residual Stewardship Signage. Clopyralid bulk-storage facilities serve a stewardship role in preventing compost-residual carryover to sensitive non-target crops; product-label compost-exclusion + manure-management requirements should be reflected in operator training + customer-handout literature at every dispense transaction.

Secondary Containment per 40 CFR Part 165. Bulk + mini-bulk pesticide storage at 500-gallon aggregate threshold requires impervious secondary containment with capacity equal to 110% of largest single vessel. HDPE secondary-containment pan, concrete-bermed pad with chemical-resistant coating, or steel-framed concrete-walled containment basin are standard.

Closed-Transfer System. EPA closed-system transfer requirements at refillable-container service eliminate operator exposure during transfer; HDPE bulk tank dispenses through dry-disconnect coupler to grower mini-bulk tote + sprayer-tender + range-pasture ATV-spot-tank + airboat-spray-tank via metering pump; air-operated diaphragm pump at 8-25 gpm transfer rate.

Heat-Tracing + Freeze-Protection. Clopyralid aqueous soluble-liquid formulation freezes near 28-30 deg F; northern installations require heated + insulated storage building or heat-traced + insulated bulk tank to maintain product fluidity through winter dormant storage. Self-regulating electric heat-trace cable + 2-inch closed-cell polyurethane insulation is the standard cold-weather package.

5. Field Handling Reality

Handler PPE. Mixer-loader-applicator PPE per clopyralid product label: long-sleeve shirt + long pants + chemical-resistant gloves (Viton, butyl, nitrile, or PTFE) + chemical-splash goggles + closed-toe footwear at mixing-loading. Closed-system handling per WPS engineering-control reduces PPE.

Tank-Truck Receipt + Mini-Bulk Transfer. Bulk clopyralid delivery is by 5,500-7,000 gallon DOT-406 stainless tanker at large ag-retailer; smaller volume by 1,000-2,500 gallon mini-bulk tote at typical mid-size + small ag-retail receiving. Tanker offload via plant-side air-operated diaphragm transfer pump at 25-100 gpm; transfer pipe is 2-3 inch PVC or CPVC + camlock or dry-disconnect + manual ball-valve isolation.

Sampling + Quality Control. Each tanker delivery requires sample collection at receipt for internal QC + supplier-COA verification: active ingredient content by HPLC, water content by Karl Fischer, pH by glass electrode, density at 20 deg C by hydrometer, color + clarity. Records retained 2-3 years for state-DOA audit.

Spill Response. Clopyralid is FIFRA-regulated environmental-hazard product with specific compost-carryover concern. Spill response: contain to floor + secondary containment, sweep liquid via wet-vac or absorbent pad + sock to HDPE drum, neutralize residual via large-volume rinse to closed-loop holding tank for licensed disposal at hazardous-waste-treatment-storage-disposal facility (Clean Earth, Veolia, Heritage, Stericycle). Vegetation + grass-clipping + manure-cleanup material should be specifically excluded from any compost stream and instead routed to licensed disposal. State DEP + EPA National Response Center notification at any spill exceeding RQ; state-DOA notification at any incident-of-concern.

Tank Cleaning + Inspection. Annual tank inspection per facility 40 CFR Part 165 + state-DOA framework: drain to recovery tank, triple-rinse with potable water, neutralize rinse waste at on-site holding for licensed disposal, inspect interior for residue at fill-line + outlet, refill at next campaign. Confined-space entry per OSHA 29 CFR 1910.146.

Compatibility With Other Pesticide Storage. Clopyralid storage should NOT be co-located with strong oxidizers (calcium hypochlorite, sodium hypochlorite, hydrogen peroxide), strong acids, or strong bases at adjacent secondary containment. Dedicated pyridine-carboxylate storage at separate containment + clear labeling prevents cross-contamination.

Talk to OneSource Plastics

Listed price covers tank + standard fitting package; LTL freight is quoted separately to your delivery ZIP. Call 866-418-1777, use our freight estimator, or try our chemical tank recommender to narrow material selection.