Answer: As you have noticed, some crabapple varieties have better resistance than others to certain foliage problems but unfortunately many crabapple varieties are susceptible to the same foliage problems that attack regular apples. Often these must be treated with an annual spray program which is dictated in part by weather conditions each year. You might wish to contact your County Extension (683-0110) for both a positive identification of the problem and the most up-to-date control recommendations along with the suggested timing for any necessary spray applications. In the meantime, it is a good idea to clean up and remove and destroy any fallen leaves from the affected trees to help reduce reinfection. Good luck with your trees!
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