Red turpentine beetle(Dendroctonus valens,RTB),which was probably introduced from USA,is one of the most important invasive pests in Chinese forest ecological system.The beetle traits had changed a lot since it was introduced to China,and the changed traits were linked to the abnormal mortality of Pinus tabulaeformis caused by the beetle in the northern China.Ophiostomatoid fungi were well-known to have widespread symbiotic relationship with the beetles,such as Coleoptera:Scolytidae.The symbiotic fungi were...