Japanese oak wilt (Raffaelea quercivora) is a fungal pathogen. It is a native of Japan .
Raffaelea quercivora, an ambrosia fungus closely associated with and vectored by Platypus quercivorus, is associated with Japanese oak disease. Recent studies have shown that the cause of oak tree mortality is the blockage of the ascent of sap induced by the fungus which is transmitted by the insect. This is the first example of an ambrosia beetle fungus that kills vigorous trees.
For more information about this plant pest, see the CAPS data sheet and the CABI data sheet.