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Saudi Journal of Biological Sciences 15 (2) 231-236
December, 2008 |
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Eucalyptus trees are plants of industrial and medical
importance. In this study tumor or canker disease of exotic plantation
Eucalyptus globulus trees has been recorded in Al-Taif province -
Kingdom of Saudi Arabia . The obvious symptoms of the disease include
tumors at leaf mid-rib, stem and petiole along with chlorosis in the
leaves. Histological investigation of collected plant samples from
infected and healthy ones using hand sectioning technique, revealed
complete destruction of vascular tissues and entire hydrolysis of xylem
vessels into large cavity, a record not viewed in healthy plant parts.
Microbiological investigation of the plant parts leaf, petiole and stem
of all samples revealed fungal infection by Alternaria alternata upon
inoculation of potato dextrose agar media supplemented with
chloramphenicol. ______________________________________________________________________________________________________ |
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