What describes a protectant fungicide?

• A. Acts like an exterior shield that protects the plant from certain fungi or bacteria; good coverage of the plant is essential.
• B. Fungicides that are absorbed and move within the plant from the site of application to other tissues.
• C. A chemical that is absorbed into the immediate area of application to the plant but doesn't travel far from the application site.
• D. A pesticide that kills all pathogens on contact.

Answer: (A)

Protectant fungicides act as an exterior shield on the plant’s surfaces, creating a protective barrier that blocks infection by certain fungi and bacteria. Because they sit on the surface, good coverage of all parts of the plant is essential—any untreated area can become a weak spot where infection can take hold. They work best when applied before infection starts and remain on the surface rather than moving inside the plant; they can be washed off by rain or irrigation, so timely reapplication is often necessary.

Systemic fungicides are absorbed and translocated within the plant from the application site to other tissues, which is not how protectants function. The idea of a chemical that is absorbed only in the immediate area and doesn’t travel far describes a limited-local action that still doesn’t capture the barrier-on-plant concept. And fungicides that claim to “kill all pathogens on contact” overstate what they do, since protection is specific to certain pathogens and depends on staying on the surface and proper coverage rather than instant universal kill.