Commercial orchards tend to spray more than necessary to get the same results in a home orchard. In NY, I get pristine apples by beginning sprays about July 7th and continuing with sprays every 2 weeks with one spray in Sept. However, I use either Pristine or Flint in the tank along with the Captan that may be all your commercial grower is using.
This works even though the Cornell gurus say that if you donāt keep protection on through June it will be too late to protect them by July. My schedule has worked for me for about 6 years straight in multiple sites. It will never be a better year for fungus than last.
Of course, this schedule would likely have to be tweaked to work in GA, but the point is you canāt know the minimum requirement for results in an orchard unless you push the envelope.