Abstract: Camellia oleifera is one of the most important economic trees and has been planted widely in subtropical areas in China. But the pest insects feeding on C. oleifera trees have seldom been concerned. The pest insects of C. oleifera and their natural enemies captured by ultra violet light in Quzhou were surveyed in the present paper, and diversity and population dynamics of the insects collected were analyzed. The results showed that 103 pest insects belonging to 6 orders, 33 families, 81 genus were found. 41521 individuals were trapped during 2012-2013, and the leaf defoliators were predominant. The seasonal dynamics of pest insect populations were influenced by the climate conditions, the growth stages of C. oleifera trees, and fruit picking. The peak period of the pest activities was from May to September, and April and October were just two transitional periods when the pests and natural enemies switched from overwintering to activity and from activity to overwintering, respectively. Natural enemies were also attracted by ultra violet light trap, and 983 individuals in 21 species were trapped in the two years. These results may provide a theoretical basis for the integrated pest management of C. oleifera.

Key words: climate change., Lancang River, hydrological time series, statistical experiment, abrupt change