Effects of Spraying Ozonated Water on the Severity of Powdery Mildew Infection on Cucumber Leaves

Abstract

Effects of spraying ozonated water on the severity of powdery mildew infection, visible disorder/injury occurrence, and net photosynthesis in cucumbers were investigated. The severity in the ozonated water treatment was contained to almost the same level throughout the 14-day period of the experiment, while the severity steadily increased in the non-treated control and distilled water treatment. Neither visible disorder/injury on the leaves nor a large difference in net photosynthesis between before and after spraying the ozonated water was observed. The results indicate that ozonated water can be at least a partial alternative to agricultural chemical fungicides for powdery mildew on cucumber leaves.

Keywords:

• Ozone
• Agricultural Applications
• Powdery Mildew
• Cucumber
• Sphaerotheca fuliginea