Evaluate the UV Treatment after 10-12 days
Three possible outcomes emerge
No new unwanted growth but small indications of stress.
Dose too high
Decrease the amount of time the plant is administered treatment and rerun trial.
New growth still shows mildew.
Dose too low
Increase the amount of time the plant is administered treatment and rerun trial.
New growth shows no mildew and plants look healthy
Continue with the current treatment schedule and record and reevaluate periodically.