Suitability of locations in Africa and Europe for the alligator weed flea-beetle predicted by Ecoclimatic Indices (EI). Crosses indicate locations rated by CLIMEX as unfavourable for the flea-beetle, and the areas of circles are proportional to the suitability for the flea-beetle; shaded circles (EI < 25) indicate locations where the flea-beetle may establish but not exert control over alligator weed.