The French ragweed observatory has made a new leaflet dealing with 9 invasive species, among which Ambrosia artemiisifolia L. and Ambrosia trifida. You can consult this well detailed document (in French) here.
Sarah LABRUYERE and Marilou MOTTET from the French ragweed observatory made an English version of the video on the Ambrosia leaf beetle Ophraella communa (with the participation of Bruno Chauvel, Heinz Mueller-Schaerer, Suzanne Lommen and Benno Augustinus).
The French Observatory of ragweed has recorded more than 80 events for the International Ragweed Day. Almost half of them took place in the Auvergne – Rhône-Alpes region, the most infested region of France. See details here.