Canker lesions first appear as small dark depressed areas on young, smooth barked stems, often killing twigs by girdling. Most cankers are centered on small branch stubs or their remains. Diseased trees usually have more than one canker. This disease is among the most important stem diseases on birch.
Remove cankered branches. Maintain proper moisture and fertility.
Chemical controls are not available for the control of Birch canker. Good cultural practices should be used to help maintain tree health.
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