Japanese oak wilt
Japanese oak wilt (also called mortality of oak trees in Japan) is a fungal disease caused by Raffaelea quercivora fungus affecting by oak trees. In 1998, Japanese plant pathologists group was isolation, inoculation and reisolation the dead tree.[1] It is the first disease known that Raffaela fungus cause plant disease.
Symptoms[edit]
The first obvious symptom was that the leaves wilted, and many small holes appeared on the trunk. The leaves turned to red and died back quickly (1 or 2 weeks), and finally the tree died. If you cut the dead tree, you would discover the xylem had been discolored to brown.[2]
Mechanism[edit]
The oak trees react plugging their xylem with gum and tyloses for blocking the fungus spreading.[2] It's the same reaction of elm vs. Opiostoma fungus at Dutch elm disease.
Treatment[edit]
JOW treatment is resemble other fungus insect vector diseases such as Dutch elm disease or Pine wilt.
Exterminate beetle[edit]
The majority of this disease treatment is cut down the dead oak trees, and killed the vector ambrosia beetles by burned timber or infused insecticide.
Exterminate fungus[edit]
Some fungicide are developing and trying to inoculation.
See also[edit]
Raffaelea disease[edit]
- Laurel wilt - caused by R. lauricola, and R. canadensis
- Korean oak wilt - caused by R. quercus-mongolicae
Several tree wilt disease in the world[edit]
Mortality of oaks[edit]
References[edit]
- ^ Ito S., Kubono T., Sahasi N., Yamada T.(1998)Associated fungi with the mass mortality of oak trees. Journal of the Japanese Forestry Society 80(3), 170-175.
- ^ a b Kuroda, K.; Yamada, T. (1996). "Discoloration of sapwood and blockage of xylem sap ascent in the trunks of wilting Quercus spp. following attack by Platypus quercivorus". Journal of the Japanese Forestry Society. 78 (1): 84–88.
Further reading[edit]
- Kamata, Naoto; Esaki, Koujiro; Kato, Kenryu; Oana, Hisahito; Igeta, Yutaka; Komura, Ryotaro 2007. Japanese oak wilt as a newly emerged forest pest in Japan: why does a symbiotic ambrosia fungus kill host trees?. In: Gottschalk, Kurt W., ed. Proceedings, 17th U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species 2006; Gen. Tech. Rep. NRS-P-10. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 1-3.