What does REI stand for on turf labels, and why does it matter?

• A. Reentry Interval; indicates how long workers must wait before re-entering treated areas without PPE
• B. Reciprocity Enforcement Index; indicates permit reciprocity requirements
• C. Required Exposure Interval; indicates PPE requirements for re-entry
• D. Re-entry Instruction; indicates where PPE is required for re-entry

Answer: (A)

Reentry Interval is the time after a turf pesticide is applied during which entering the treated area is restricted to protect workers from exposure. This matters because it tells you when it’s safe to go back on the turf and whether you must wear the protective gear listed on the label if you need to enter sooner. Labels specify the REI in hours or days, and during that interval you should either stay out or enter only with the required PPE. Once the interval passes, entry is permitted under the label’s other conditions. For turf management, understanding REI helps you schedule mowing, aeration, and other maintenance so you don’t violate the label and so workers aren’t exposed to residues.