Answer: Crabapples can be subject to a variety of pests and diseases, just as orchard apples can be. To some extent susceptibility depends on overall health of the trees, the innate resistance of the specific variety you are growing, and the prevalence of particular pests and diseases in your area. Sometimes too the weather each year can contribute to problems. For these reasons I would suggest you work with your local county extension to develop a routine preventive maintenance and pruning program. They will be able to help you determine what to spray for, the best product(s) to use, and the best timing for doing so based on the local weather each year. It is really better to develop a customized plan rather than simply "spray". Good luck with your trees!
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