Study on the Tree Brown Root Rot Disease
| Autor: | Chuen-Hsu Fu, 傅春旭 |
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| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 Tree brown root rot disease caused by Phellinus noxius (Corner) Cunningham. is the most important tree disease in Taiwan. 100 plant species had been reported to be infected by the pathogen, and the disease is expanding .more seriously. Another 41 tree specis are newly found to be infected by P. noxius. The result of experiment showed high inoculum potential and wounds would promote to finish the pathogenicity test. Making use of characteristic of wood decayed fungus, inserting chopsticks into the diseae area could applicably estimate the relative population size of the pathogen in the disease area, and the effect of control measures. Many fungicides showed the abililty of killing or inhibiting the pathogen, but the chemical had to touch the pathogen. In the field, a lot of water help the spread of chemical and increase the effectivity of fungicide. Dazomet is an agricultural fumigant, and kills the brown root rot fungus effectively in the laboratory and field test. Tree surgery treatment was applied to the preliminarily infected and still alive tea trees. The infected root tissues were excised, and treated the wound with fungicides Triadimefon（500X） and Qxine copper （500X）. Tree brown root rot disease was a fast wilted disease, and infected trees survived only for 3 months from falling leaves to death on general observation and documents. The tea trees have survived for more than 8 months after tree surgery and chemical treatment, and grown new twigs and leaves. These diseased trees were gradually restored. Optimal temperature range for mycelial growth of the 23 isolates P. noxious from Taiwan were very different. Using ITS analysis, the 19 P. noxious isolates can be divided into two groups. P. noxious is famous pathogen of trees and also important white wood-decayed fungus. It can decompose cellulose and lignin. Inoculating P. noxious on woodblocks of china fir and machilus tree, 2.8﹪and 9.6﹪ weight loss were caused respectively during 12 weeks test. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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