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- Title
First report of downy leaf spot of walnuts caused by Microstroma juglandis in Turkey.
- Authors
Kurt, S.; Soylu, E. M.; Soylu, S.
- Abstract
In the spring of 2001, diseased trees of Juglans regia in Hatay, in the Mediterranean region of Turkey, showed typical symptoms of downy leaf spot, especially following moist and cool conditions. A survey was conducted in the affected regions, which included 12 orchards in Antakya and five orchards in Altinozu districts. Initially, disease symptoms were characterized by a whitish efflorescence containing fungal structures and spores on the lower surface of the affected leaf, often concentrated along the veins, and a yellowish discoloration on the corresponding upper surface of the leaf. In the later stages of disease development, as the leaf spots enlarged, diseased tissues became necrotic. Examination of leaf infections using scanning electron microscopy revealed that whitish polygonal efflorescences were basidial structures forming oval basidiospores (6.2-7.8×2.9-3.4 μm). The fungus was identified as Microstroma juglandis, a member of the Exobasidiales, based on morphological and cultural characteristics of the basidium and basidial structure.
- Subjects
ORCHARDS; FUNGAL diseases of plants; EFFLORESCENCE; SCANNING electron microscopy; EXOBASIDIALES
- Publication
Plant Pathology, 2003, Vol 52, Issue 3, p409
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1046/j.1365-3059.2003.00830.x