Effect of Altitude on Adult Emergence, Pupal Mortality and Adult Sex Ratio of Chinese Citrus Fly, Bactrocera minax (Enderlein) (Diptera:Tephritidae)

Problems of Chinese Citrus Fly (CCF), Bactrocera minax (Enderlein) in citrus orchards have been increasing Nepal. The reason behind the failure CCF control is lack a clear and thorough understanding adult emergence period different altitudes. Therefore, pupae were collected from soil below infested sweet orange trees Sunapati Rural Municipality, Ramechhap, Nepal reared containers height 5 cm diameter 6 (10 per container) randomized complete block design selecting locations as treatments, viz. 1247 masl (Bethan), 1354 (Nagsiwa), 1443 (Aarukharka), 1561 (Sadi), 1650 (Dimipokhari) replicating four times. Early peak emergences (four weeks earlier 4th week April) occurred at lower altitudes compared to higher (in May), where peak-emergence was recorded. Male: female ratio (range 1.05-1.37) did not differ significantly altitudes, while pupal mortality (25%) found be highest upper elevations. study concludes that fly management strategy should made according date least two elevations than