ABSTRACT Citrus plants are a mainstay commodity for horticulture in Riau Province, especially Siamese oranges. Citrus cultivation is inseparable from fruit fly pests (Bactrocera spp.). This study aims to obtain the types and populations of fruit fly pests that attack Siamese oranges (Citrus nobilis Lour) in Sangkir Indah Village, Pagaran Tapah District, Rokan Hulu Regency. The research method …