Why can too much wetting agent reduce effectiveness?

Why can too much wetting agent reduce effectiveness?

• A. It can cause runoff, reducing spray deposits.
• B. It increases leaf adhesion.
• C. It prevents evaporation.
• D. It improves coverage.

Answer: (A)

Wetting agents lower surface tension so spray droplets spread out and cover more of the leaf surface, improving contact with pests. When too much is used, droplets can flatten into very thin films that don’t stay on the leaf long enough and may run off the surface. This runoff means fewer deposits remain where they’re needed, so coverage and effectiveness drop. In short, excessive wetting agent can cause the spray to wash away rather than stay put, reducing the treatment’s performance.

Wetting agents lower surface tension so spray droplets spread out and cover more of the leaf surface, improving contact with pests. When too much is used, droplets can flatten into very thin films that don’t stay on the leaf long enough and may run off the surface. This runoff means fewer deposits remain where they’re needed, so coverage and effectiveness drop. In short, excessive wetting agent can cause the spray to wash away rather than stay put, reducing the treatment’s performance.