 We usually figure fungicide residual lasts two to three weeks. Between that and the fact that new leaves since your last treatment won't have fungicide on them, if you have late season diseases you're trying to stop, spraying an additional time or two may be best. So those are the big factors with fungicide success. It's spraying early and often with the right product and aiming for maximum spray coverage. If you do all that, you should have good control. For great control, stay tuned for our final tips of the day right after this.