Sulfur can also be effective, but can russett fruit and needs to be reapplied at 7 day intervals. Next season, apply 2 to 4 more SI sprays, starting at pink. Since the SI fungicides are effective against scab in pink, bloom, petal fall and fruit set sprays, simply making sure to use one of the SI fungicides during that period should also eliminate powdery mildew. Post-harvest rot fungicides. The post-harvest fungicide options this year are very limited.
Fungal spores build up in the dip tank water, and get into wounds, and eventually cause infections.
Only some varieties, notably Cortland and Delicious, are susceptible to scald. If DPA isn't needed, there is no need to dip, and no need to treat with Mertect or captan. If apples need to be dipped for scald, then Mertect or captan or both will need to be added to the tank. Mertect, compared to the previously registered fungicides Benlate and Topsin M, tends to settle in the bottom of the tank, where it is ineffective. Constructing or purchasing a recirculating unit for drench tanks will solve this problem.