Which is a general best practice when applying pesticides inside a greenhouse?

• A. Ensure adequate ventilation
• B. Increase humidity to improve coverage
• C. Skip PPE to save time
• D. Allow off-target drift to occur

Answer: (A)

In a greenhouse, keeping the air moving and exchanging helps protect workers from inhaling toxic vapors and reduces the buildup of pesticide residues in the enclosed space. Adequate ventilation dilutes airborne chemicals, lowers inhalation risk, and helps clear fumes quickly during and after application, which is why it’s the best general practice.

Raising humidity to improve coverage isn’t reliable or universally safe—higher leaf wetness can lead to crop damage, encourage disease, and sometimes affect how the product works. Skipping PPE violates safety rules and label requirements, increasing personal risk. Allowing off-target drift isn’t something to tolerate; drift should be minimized to protect people, crops, and surroundings.