Occurrence of Shallow Bark Canker of Walnut ( Juglans regia ) in Southern Provinces of Iran

摘要

From April 2001 to November 2002, samples of walnut branches and trunks with symptoms of shallow bark canker were collected from Fars and Kohgiluyeh-va-Boyerahmad provinces. Symptoms of the disease were small cracks in the bark of the trunk and scaffold b