Laboratory colonization and life history characteristics of the canyon fly (Fannia conspicua)

Flies of the Fannia benjamini Malloch complex (Diptera: Muscidae), commonly known as “canyon flies” are significant pests of humans and animals. This group is represented by several species in the southwestern United States. Fannia conspicua Malloch, a member of the F. benjamini complex, is an emerging pest in the dry canyon areas of coastal and southern California where they develop in large numbers in the understory of an exotic low-growing succulent plant called red apple (Aptenia cordifolia [L.f.]N.E.Br.) that was introduced into the area during the 1980’s to manage hillside erosion and for fire suppression near residential homes. However, the native developmental site for these flies remains unknown.  This pest fly species has been colonized in the laboratory utlilizing red apple as an oviposition and larval development substrate.  Life history characteristics including degree-day development rate, tolerance to dessication, and fecundity were examined and will be discussed.