The overwhelming popularity of crabapples has made this disease one that we encounter regularly. This is a fungal disease that causes spots to form on the leaves of crabapples starting in the spring. The spots enlarge as the season progresses and the leaves begin to drop by mid summer. Often by August, a highly susceptible tree will be almost completely defoliated. In addition, the fruit is affected which will disrupt the fruit display that normally graces a disease free tree in the fall. The disruption of photosynthetic leaf area and premature defoliation of the tree on a yearly basis will reduce the amount of photosynthesis that occurs and result in a weakened tree. We have been very successful in treating this disease with both foliar sprays and injections.
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