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ABSTRACTSeveral species in the Euwallacea fornicatuscomplex have emerged as important pests of woody plants globally, particularly in habitats where they are invasive aliens. These beetles live in obligate symbioses with fungi in the genus Fusarium. In this study, we identified Euwallaceaspp. and their fungal mutualists that have emerged as pests of planted Acacia crassicarpain Riau, Indonesia. Morphological identification and phylogenetic analyses of the mitochondrial cytochrome oxidase csubunit I (COI) gene confirmed that E. similisand E. perbrevisare the most abundant beetles infesting these trees. Multilocus phylogenetic analyses of their fungal mutualists revealed their nonspecific association with six Fusariumspecies. These included F. rekanumand five novel Fusariummutualists within the Fusarium solanispecies complex (FSSC), four of which reside in the Ambrosia FusariumClade (AFC). These new species are described here as F. akasia, F. awan, F. mekan, F. variasi, and F. warna.