Well-timed preventive spraying applications are important, especially in apple varieties in which bud breaking begins in a rainy period.
It is common to have a minimum of two preventive spraying applications from bud break until weather conditions become stable. It is suggested that additional treatments should be applied every 8-10 days in varieties that the buds break in rainy periods.
The following fungicides are still in use in one or more parts of the world: tebuconazole, trifloxystrobin, cyproconazole, and azoxystrobin (applied only for when (and if) apple scab symptoms are clearly present), and captan, dithianon, bromuconazole, mancozeb, and sifenazolenoco.
Do not use products based on the same active ingredient in consecutive treatments, as this may induce fungi resistance to that specific ingredient used.