Answer: Harry Lauder's Walking Stick (Corylus Avellana 'Contorta') is known for its resistance to pests and diseases but occasionally can be bothered by foliage and twig blight, spider mites or leafhoppers. I can't tell without looking at your plant so I don't know if you are dealing with a disease or an insect problem. Since it is such a valuable specimen you might want to take leaf samples and a few close up photos to your cooperative extension office for positive diagnosis of the problem and suggested control measures. Contact Otsego County Cooperative Extension, 123 Lake St, Cooperstown, NY 13326-1017 phone (607) 547-2536.
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