Optimization Strategy to Inhibit Droplets Rebound on Pathogen-Modified Hydrophobic Surfaces

Area of Science:

• Agricultural Science
• Plant Pathology
• Surface Chemistry

Background:

• Pesticide spray deposition and retention on hydrophobic plant leaves is a significant agricultural challenge.
• Plant diseases can create hydrophobic surfaces, further complicating pesticide application.
• Existing research often focuses on adding surfactants to water, not pesticide solutions.

Purpose of the Study:

• To investigate the impact of surfactants added directly to pesticide solutions on droplet behavior and retention.
• To analyze the kinetic behavior of pesticide droplets on cucumber leaves affected by powdery mildew.
• To develop a strategy for improving pesticide spray deposition and retention.

Main Methods:

• Kinetic analysis of pesticide droplets containing surfactants on cucumber leaves with powdery mildew.
• Analysis of droplet bounce and splash by examining pinning sites and viscous dissipation.
• Observation of practical pesticide spray applications.

Main Results:

• Surfactants added to pesticide sprays significantly reduced droplet bounce, splash, and powdery mildew spore ejection.
• Adhesion and retention of pesticide sprays on cucumber leaves increased.
• The study provides insights into droplet-surface interactions on diseased plant leaves.

Conclusions:

• Adding surfactants directly to pesticide formulations is an effective strategy to enhance deposition and retention.
• This method improves pesticide efficacy by minimizing losses due to bounce and splash.
• Understanding droplet dynamics is crucial for optimizing agricultural spray applications.