Dothistroma needle blight is a common disease of pine trees that are not native to Iowa. Dothistroma is rarely serious but there are treatment options for severe infections. See this article for more information
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Dothistroma needle blight
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For other trees and disease symptoms less common in Iowa, please contact us describing your problem. We prefer that you send us images, and as much information about the problem as you can including; when did you notice the problem, are multiple trees affected, what are the symptoms you are seeing etc.