What is the primary difference between short-term pesticides and residual pesticides?

• A. Short-term pesticides have residual activity; residual pesticides do not
• B. Short-term pesticides have no residual activity and are only active on pests hit with it
• C. Both stay active indefinitely
• D. Residual pesticides evaporate quickly

Answer: (B)

The main idea is persistence after application. Short-term pesticides act quickly on what you apply them to but do not leave an active residue, so their effect ends once they break down and the treated pests are gone. Residual pesticides are designed to leave a lasting residue on surfaces or in the environment, continuing to kill or deter pests after the initial spray has dried. This means short-term products require reapplication to maintain control, while residual products provide extended protection, though environmental factors and label instructions can influence how long that protection lasts.