| occurrence of shallow bark canker of walnut (juglans regia) in southern provinces of iran. | 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 branches of mature trees with dark watery exudates which stained the affected trunk or limb. by removal of phelloderm, extensive necrosis of the underlying tissues was observed. in some cases, necrosis extended to cambium and outer xylem. sixty-o ... | 2007 | 19069966 |