Purpose of Review Quambalaria spp. are fungal pathogens originating from Australian eucalypt species that are becoming increasingly important globally. For example, Quambalaria eucalypti, which was once considered a minor pathogen, now poses a significant threat to plantation productivity and forest health across continents. Their spread has been made possible through the expansion of eucalypt plantation forestry outside Austr...

Symptoms consistent with polyphagous shot hole borer ( Euwallacea fornicatus ) and Fusarium dieback ( Fusarium euwallaceae ), recognised as high priority environmental pests for Australia, were observed on a single box elder ( Acer negundo) tree in Sydney, New South Wales, in March 2022 during routine forest biosecurity surveillance. Delimiting surveys were undertaken around the Sydney basin, extending radially from the origin...

Ambrosia beetles have co-evolved symbiotic relationships with an array of fungal partners. Mutualistic fungal partners are often highly successful in vertical transmission between beetle generations. These persisting relationships can alter beetle behaviour, resulting in the opportunity to occupy new ecological niches and to spread geographically. In Australia, ambrosia beetles are not currently considered a significant pest i...

Human‐associated introduction of pathogens and consequent invasions is very evident in areas where no related organisms existed before. In areas where related but distinct populations or closely related cryptic species already exist, the invasion process is much harder to unravel. In this study, the population structure of the Eucalyptus leaf pathogen Teratosphaeria nubilosa was studied within its native range in Australia, in...

Ophiostoma ips is a common fungal associate of various conifer‐infesting bark beetles in their native ranges and has been introduced into non‐native pine plantations in the Southern Hemisphere. In this study, we used 10 microsatellite markers to investigate the population biology of O. ips in native (Cuba, France, Morocco and USA) and non‐native (Australia, Chile and South Africa) areas to characterize host specificity, reprod...