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

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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

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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

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JOW treatment is resemble other fungus insect vector diseases such as Dutch elm disease or Pine wilt.

Exterminate beetle

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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

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Some fungicide are developing and trying to inoculation.

See also

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Raffaelea disease

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  • Laurel wilt - caused by R. lauricola, and R. canadensis
  • Korean oak wilt - caused by R. quercus-mongolicae

Several tree wilt disease in the world

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Mortality of oaks

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References

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  1. ^ 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.
  2. ^ 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

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