What is the purpose of the Restricted Entry Interval (REI) on a pesticide label?

• A. To indicate the required waiting period before entry into a treated area
• B. To indicate the weather conditions required
• C. To indicate the yield
• D. To indicate storage temperature

Answer: (A)

The key idea here is protecting workers from exposure after a pesticide is applied. A Restricted Entry Interval is the minimum waiting period defined on the label that must pass before people can enter the treated area. During that time, residues or vapors may still pose a risk, so entry is restricted to reduce potential contact or inhalation. After the interval has elapsed, entry is allowed under the label’s safety directions, including any required personal protective equipment or specific entry conditions. The other options don’t match this safety purpose: weather conditions, crop yield, or storage temperature aren’t about protecting people from pesticide exposure after application.