Pesticide Labels and Formulations
The label is the instruction manual and the law
The label states the registered sites, pests, rates, application methods, PPE, reentry interval (REI), preharvest interval (PHI), storage, and disposal. PPE on the label is a minimum for that product; state rules or your own exposure assessment may require more, never less. Signal words reflect the most severe acute toxicity route: DANGER-POISON with a skull and crossbones for Category I oral or inhalation toxicity, DANGER for Category I dermal or eye effects, WARNING for Category II, and CAUTION for Categories III and IV.
Formulations matter
Emulsifiable concentrates carry solvents that can injure sensitive foliage, soften rubber, and penetrate skin. Wettable powders and water-dispersible granules are abrasive and dusty, so they wear nozzles and pose an inhalation risk. Flowables separate and need agitation. Granulars are applied to soil and produce little drift. Microencapsulated products release slowly, which can extend residual hazard to bees. Fumigants require specialized certification and buffer zones.
Traps
- Assuming a higher rate works better; exceeding the label rate is illegal.
- Forgetting that PHI and REI are two different clocks.
- Using a 24(c) or Section 18 label without keeping a copy.
- Mixing incompatible products or adding them in the wrong order.
Rule of thumb
General tank-mixing order: fill the tank about half with water, add dry formulations (WP, WDG) first, then flowables, then emulsifiable concentrates, then surfactants or other adjuvants, and finish filling while agitating. When in doubt, run a jar compatibility test first.