Abstract: Bactrocera dorsalis (Hendel) is an important insect pest of fruits and vegetables. Here we conducted an investigation on its host species in different orchards and vegetable gardens over the year in 2014 in Mengzi, Yunnan, China. We found that 20 species of fruits, which belonged to 19 genera in 8 families, were damaged by B. dorsalis. The fruit species including loquat, peach, jujube, guava, mango and wax apple were seriously damaged by B. dorsalis. We collected and incubated damaged fruits, and four fruit fly species were identified, including B. dorsalis, B. cucuribitae, B. tau, and B. latifrons. B. dorsalis can damage fruits in all seasons of the year with overlapping generations. In the loquat orchards, B. dorsalis population increased in May and reached a peak in August, with the maximum trap value （362.27±16.68） heads per bottle. The population dropped rapidly after October and reached the lowest level in December (（6.14±3.06） heads per bottle). Multiple meteorological factors were found to influence B. dorsalis population fluctuations. Average monthly temperature, monthly lowest temperature, rainy days within a month and mean daily sunshine time were the main factors influencing B. dorsalis’s population dynamics.

Key words: planting age, nematode community structure, rhizosphere, Lycium barbarum, soil physicochemical characteristics.