Seed Treatment (4), Aquatic (5), Right-of-Way (6)
Seed Treatment (4)
Treating seed before it is planted
Seed treatment puts fungicide, insecticide, or nematicide directly on the seed to protect the germinating seed and seedling. It is a low-volume, high-concentration operation where accuracy and dust control matter far more than gallons applied.
Rates and equipment. Rates are usually given per 100 pounds (cwt) of seed, not per acre; the planted rate per acre then follows from the seeding rate. Commercial rotary treaters, slurry and mist treaters, and on-farm drum treaters must be calibrated by weight. Coverage uniformity determines control.
Dust and pollinators. Planter dust containing insecticide seed treatments has been linked to bee kills. Follow label requirements on talc and graphite use, avoid loading near blooms, and dispose of empty seed bags properly.
Rules and traps. Treated seed is not food or feed: it cannot be sold, fed, or used for ethanol or oil, and treated seed that is not planted must be destroyed or returned per the label. Colorant requirements make treated seed identifiable. A seed-treatment product may be labeled for commercial treaters only. If a seed treatment carries a restricted-use active ingredient, the treated seed may be treated as an RUP unless a specific exemption applies.
Oklahoma angle. Wheat and small-grain seed treatment for smut, and insecticide treatments for Hessian fly or aphids, are common; cotton and sorghum seed normally arrive pretreated.
Worked example. A treater applies 60 lb of seed per acre and the label rate is 3 fl oz per 100 lb. Dose per acre = (60 ÷ 100) × 3 = 1.8 fl oz per acre. At 60 lb per acre that is 3 fl oz per cwt exactly - check per-batch weight, not per acre.
Aquatic (5)
Ponds, lakes, ditches, and canals
Aquatic pest control targets algae, submerged and emergent weeds, and sometimes mosquitoes in standing water. Oklahoma applicators work on farm ponds, stock tanks, irrigation canals, and larger water bodies.
Products and sites. Copper compounds, endothall, 2,4-D, diquat, fluridone, glyphosate, imazapyr, and flumioxazin dominate the list, but each label names specific use sites. A product labeled for a closed pond may be illegal in a flowing ditch or a public lake. Check whether the water is public, whether fish and wildlife are present, and whether the state or Army Corps requires permits.
Permitting. Federal law requires NPDES permit coverage for certain aquatic pesticide applications; Oklahoma DEQ administers the state program. Wetland and navigable water work may also need a Corps permit. Never assume an applicator license substitutes for a permit.
The two classic failures. First, killing too much vegetation at once depletes oxygen and kills fish - treat in sections, typically a quarter to a third at a time, and check dissolved oxygen. Second, ignoring water-use restrictions: drinking, swimming, livestock, and irrigation intervals differ by product, and ornamentals and tomatoes are injured by irrigation from treated water.
Worked example. Half of a one-acre stock pond is covered in filamentous algae in July. Treat a quarter to a third, wait for oxygen to recover, then retreat, and confirm the product's livestock watering restriction before cattle return.
Right-of-Way (6)
Roadsides, rails, and utility corridors
Right-of-way work manages vegetation along highways, railroads, pipelines, and electric lines. The goal is not to kill everything: it is to keep sight lines, drainage, and access safe while holding down maintenance cost and protecting adjacent land.
Program types. Bareground treatments under guardrails and around signs, grass suppression on shoulders, brush control under power lines, and selective release of low-growing species. Methods include broadcast, spot, directed, cut-stump, basal, and frill.
Drift discipline. Adjacent fields, orchards, vineyards, and gardens are the risk. Watch wind speed and direction, inversion conditions, nozzle type, boom height, and speed. Use low-drift formulations rather than volatile esters when sensitive crops can be reached. Rail and highway work may require notice to the controlling agency and, in some cases, to adjacent landowners.
Records and identification. Document the site, product, rate, date, weather, and applicator. Vehicles and equipment should be identified and the work should match the contract or management plan.
Trap: a product labeled for forestry or for industrial noncropland is not automatically labeled for rights-of-way, and ditch bottoms that carry water need an aquatic-labeled product.
Worked example. A crew treats a railroad grade one mile from a cotton field. Because cotton is exquisitely sensitive to auxins, select a non-auxin product or apply only outside a state-defined buffer during the susceptible window, and record the weather data.