Why does dense foliage reduce control effectiveness?

Why does dense foliage reduce control effectiveness?

• A. It increases pesticide potency.
• B. It prevents spray from reaching lower leaf surfaces.
• C. It makes pests stronger.
• D. It dries too fast.

Answer: (B)

Dense foliage blocks the spray from reaching inner and lower leaf surfaces where many pests feed. Coverage is essential for contact with pests, so when the canopy is thick, droplets deposit mainly on the outer, upper leaves and don’t penetrate to the undersides or deeper inner foliage. That incomplete coverage leaves pests unharmed and reduces overall control effectiveness. In practice, opening the canopy or adjusting spray technique to improve penetration helps ensure the pesticide reaches the pests on those lower surfaces.

Dense foliage blocks the spray from reaching inner and lower leaf surfaces where many pests feed. Coverage is essential for contact with pests, so when the canopy is thick, droplets deposit mainly on the outer, upper leaves and don’t penetrate to the undersides or deeper inner foliage. That incomplete coverage leaves pests unharmed and reduces overall control effectiveness. In practice, opening the canopy or adjusting spray technique to improve penetration helps ensure the pesticide reaches the pests on those lower surfaces.