Pesticide Formulations, Labels, and Environmental Fate
Labels and formulations
The label has sections you must be able to find: signal word, first aid, PPE, environmental hazards, directions for use (crop/site, pest, rate, timing, restrictions), REI, PHI, storage/disposal, and warranty. "Labeling" includes supplemental documents. Formulations change behavior: emulsifiable concentrates (EC) mix easily but solvents can burn foliage; wettable powders (WP) leave residue and need agitation; suspension concentrates (SC) are liquid; water-dispersible granules (WG/WDG) are low-dust but still require good mixing; granules and baits reduce drift but can be picked up by birds; microencapsulated products release slowly and can injure bees; fumigants require special handling.
Environmental fate
Once released, a pesticide can adsorb to soil, leach to groundwater, run off to surface water, volatilize, photodegrade, hydrolyze, or bioaccumulate. Half-life, soil organic matter, clay content, slope, rainfall, and application timing determine the risk. Read the Environmental Hazards section for groundwater, surface water, bee, and endangered-species statements.
Traps
The labeled rate is a maximum-not a target-and using less than the label rate can promote resistance. Tank-mixing two products is legal only if both labels allow it. "Restricted-entry interval" is not the same as "preharvest interval." Do not confuse product rate with active-ingredient rate.
Worked example
A label allows 1.5 pt of product per acre and you treat 2 acres: 1.5 × 2 = 3 pt. If the tank holds 50 gal and you apply 20 gal/acre, the tank covers 2.5 acres, so add 3.75 pt-but never exceed the label's per-acre or per-season maximum.
Rule of thumb: read the Directions for Use before mixing, and calculate product amount from the treated area, not from the tank size.