Ecoclimatic Indices (EI) matched to the known distribution of the alligator weed flea-beetle in the Americas. 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. Stars indicate localities where the flea-beetle has been found but climatic data are not available.