It was very easy to use, and the grower really bragged on it. If you're training young trees, you might want to try it. As apples develop beyond bloom, scout orchards for evidence of primary scab infections on fruit and on cluster leaves. If apple scab infections are detected, then continue spraying protectant materials until hot dry summer weather becomes the norm. I would use this approach only in an emergency type of situation.
Powdery mildew is particularly active from pink through the early cover sprays.
Pay special attention to spraying highly susceptible varieties such as 'Jonathan'. Cedar apple rust is also present and quite active in orchards in the middle portions of Illinois wherever American red cedars are near orchards. Again, the sterol inhibitors are fantastic for controlling rusts on highly susceptible varieties. This fungus disease can be successfully controlled only when trees are dormant. The fungus colonizes emerging buds, and infects leaves and developing fruit.