Is the leafhopper Asymmetrasca decedens (Paoli, 1932) invading Madeira Island?
An extensive sampling over two years in Madeira Island on approximately 250 plant species showed that A. decedens, a species widely distributed in the Mediterranean region, occurs on seven species of plants from six different families, consisting of two small herbaceous ornamental plants (Dahlia sp. and Tagetes minuta), two ornamental trees (Schinus molle and Enterolobium cyclocarpum), one herbaceous fruit plant (Passiflora edulis) and two wild plants (Ricinus communis and Lavatera cretica). Most specimens were associated with ornamental plants, but A. decedens was more abundant on R. communis, which is widely spread, chiefly in the south of the island, below 400 m. A. decedens was present on a wide number of habitats ranging from disturbed areas, parks and gardens, but was never found in agricultural fields and native laurel forest. A. decedens was found mainly in the southeastern part of the island at altitudes below 500 m. Specimens were collected during the whole sampling period, starting from January until October, being more common from May to September.