Which term describes a pesticide that acts by killing pests on contact and remaining on the leaf surface?

• A. Contact pesticide
• B. Containment system
• C. Carrier
• D. Cone-Spray nozzle

Answer: (A)

The key idea is a pesticide that kills pests by direct contact and tends to stay on the leaf surface. This describes a contact pesticide. It works when a pest touches the sprayed leaf; it doesn’t rely on being absorbed by the plant to be effective. The “staying on the leaf surface” part hints at a surface residue that can protect or kill pests that contact it, at least for a period before weather or washing reduces it. In turf practice, this contrasts with systemic pesticides, which are taken up by the plant and move to where pests feed, rather than acting only on contact with the leaf surface.

The other terms aren’t about how the pesticide works. A containment system relates to preventing spread, a carrier is the vehicle that delivers the active ingredient, and a cone-spray nozzle is a device for applying sprays. The description specifically matches a contact pesticide.