You should also be aware that shot hole, particularly with the evergreen laurel members of the Prunus family, has a bacterial component, Xanthomonas sp., that is typically more prevelent and rapacious than the fungal pathogens that cause shot hole. Treating with a fungicide like Fore will have little to no effect in conrolling the bacterial factor.

Unless the shrubs have been heavily damaged, the shot hole tends to be a mostly cosmetic disfigurement and does not produce the same loss of foliage as it can on deciduous members of the Prunus family. Avoiding the overhead irrigation and practicing good garden sanitation wil help but damaged foliage will always remain damaged until it is shed. However in areas of high humidity, especially during the late spring and summer months, which one would expect in areas like SC (drought aside), the problem is likely to be recurring.