biological invasions

Priority monitoring areas (1km2 grid cells) based on polyphagous shot hole borer (PSHB) reproductive host density and their proximity to plant biomass sites for (a) all reproductive hosts, and (b) Acer negundo. Red = high priority, green = low priority. A visual survey of a high priority Acer negundo monitoring site identified in our protocol detected a new PSHB infestation outside a nursery (photo credit: LJ Potgieter, 18 February 2023). Data from iNaturalist (https://www.inaturalist.org/projects/reproductive-hosts-at-risk-of-pshb-in-south-africa and https://www.inaturalist.org/projects/acer-negundo-in-south-africa, Accessed 14 February 2023)