What is the primary reason to use spreader-stickers on certain leaves?

What is the primary reason to use spreader-stickers on certain leaves?

• A. Spray may not adhere well to waxy surfaces.
• B. They increase pesticide toxicity.
• C. They speed up evaporation.
• D. They reduce spray drift.

Answer: (A)

When leaves have a waxy or very hydrophobic surface, water-based spray droplets tend to bead up and run off instead of wetting the leaf. A spreader-sticker helps overcome that repellency by lowering surface tension and encouraging the spray to spread out and stay attached to the leaf. This increases coverage and contact with the target pests, making the treatment more effective on those difficult-to-wet surfaces. It isn’t about making the pesticide more toxic or making it evaporate faster, and while some adjuvants can influence drift, the main reason to use a spreader-sticker here is to improve adhesion and wetting on waxy leaves.

When leaves have a waxy or very hydrophobic surface, water-based spray droplets tend to bead up and run off instead of wetting the leaf. A spreader-sticker helps overcome that repellency by lowering surface tension and encouraging the spray to spread out and stay attached to the leaf. This increases coverage and contact with the target pests, making the treatment more effective on those difficult-to-wet surfaces. It isn’t about making the pesticide more toxic or making it evaporate faster, and while some adjuvants can influence drift, the main reason to use a spreader-sticker here is to improve adhesion and wetting on waxy leaves.