Abstract: We conducted a survey on butterfly diversity in four districts from Sanya City: Yazhou, Tianya, Jiyang and Haitang District, from 2013 to 2014. A total of 78 species were recorded, which belong to 9 families, 49 genera. The number of species in each family was in order of Pieridae > Nymphalidae > Satyridae > Satyridae > Lycaenidae = Papilionidae > Danaidae > Amathusiidae = Acraeidae = Hesperiidae, while Pieridae butterflies accounted for 23.08% of the total number. In the four kinds of habitats, the forest in Yazhou District had the highest Shannon diversity index H and dominance index D. The largest similarity coefficient was found between residential area and farmland (0.200), followed between woodland and water area (0.172). Our results indicated that butterfly diversity was mainly related to habitat type in Sanya City.

Key words: Alternaria solani, fungistatic mechanism., Cymbopogon citratus essential oil, inhibition effect