Risk of establishment and potential impacts of transient populations of Spodoptera frugiperda in Europe

Abstract The fall armyworm, Spodoptera frugiperda (J.E. Smith), is an invasive pest threatening crop production and food security worldwide. High concerns are linked to the potential establishment of the species in Europe. The high migratory capacity of S. frugiperda cause concerns about the potential impacts of transient populations invading new areas from suitable hotspots. In the present work, we developed and used a physiologically-based demographic model to quantitatively assess the risks of S. frugiperda in Europe. The risks were assessed considering a best-, a median-, and a worst-case scenario. The Mediterranean coastal areas of Southern Europe resulted suitable for the establishment of the species, with suitable areas reaching even higher latitudes, in the worst-case scenario. In Europe, up to 4 generations per year were predicted. The predicted average yearly adult population was 5 (± 4), 17 (± 5), and 139 (± 22) in the best, median-, and worst-case assessment scenario, respectively. Model results showed that Southern and Central Europe might be exposed to the risk of transient populations, at least up to the 48th parallel north, in the worst-case scenario. Depending on the latitude and on the period of arrival of the propagule, transient populations might be able to originate 1 or more generations per year. The model can be used to define strategies reducing the risks of establishment of the pest at the country level. Predictions on the dynamics and phenology of the pest can also be used to support its management at the local level.