Define Restricted Entry Interval (REI) and its significance for workers on treated property.

• A. REI is the minimum time between crop planting and harvest.
• B. REI is the time during which harvesting must be completed after application.
• C. REI is the period after an application when entry without PPE or special authorization is restricted; workers must wait or wear required PPE per label.
• D. REI is the window to re-enter to check equipment.

Answer: (C)

Restricted Entry Interval is the period after a pesticide is applied during which entry to the treated area is limited to protect workers from exposure. Entry is only allowed if the label specifies the required PPE or other authorization is followed; without that, workers should not enter. This interval exists because pesticide residues can remain on surfaces or in the air at levels that pose health risks, even after application is finished. The label sets how long the interval lasts and what protective gear is needed, and postings or training help workers know when it’s safe to enter and what precautions to take. This concept is distinct from harvest timing after application (the pre-harvest interval), which relates to when crops can be sold or consumed rather than worker safety.