Preference and Performance of the Polymorphic Flea-beetle, Alagoasa extrema, on Selected, Weedy Lantana camara Varieties

The possible preference that the leaf-feeding flea-beetle, Alagoasa extrema Jacoby (Coleoptera: Chrysomelidae: Alticinae), might have for different South African naturalized varieties of its host plant, Lantana camara L. (Verbenaceae), was studied under quarantine laboratory conditions. Studies included adult choice trials, larval no-choice trials and multi-generation no-choice trials using five L. camara varieties. Results indicated that A. extrema exhibited a degree of varietal preference under laboratory conditions. Variety 029 White Pink proved to be the most suitable host, although the other four tested varieties were able to support viable populations of A. extrema for three consecutive generations. Should A. extrema be released as biocontrol agent for L. camara in South Africa, all five of the tested varieties should be able to support viable populations of A. extrema in the field.