The Risk Assessment of Pine Wood Nematode Disease in Huangshan Scenic Area I. Pine Bore Species Population and Dynamic Monitoring

The pine borer species, action duration of main pine borer, interspecific population density, vertical distribution rate of population density, change law of the population density of 5 pine borer in 2001, and egg breeding of female pine sawyer, Monochamus alternatus in different trapped duration are described. The results showed that 14 species of pine borer are breeded in Huangshan Scenic Area, of which 5 species are important pine borer, i.e. Shirahoshizo patruelis, M. alternatus, Spondylis buprestoides, Arhopalus rusticus and Hylobius abietis haroldi, occupying 61.6%, 27.0%,5.5%,3.8% and 2.2% of the total species population density respectively. The Tianhai scenic spot (1 658 m above sea level) is the highest zone of the vertical distribution of M. alternatus adult, and the Baiting scenic spot (318 m above sea level) is the distribution zone of the highest population density, occupying 80.9% of the total number trapped. The mean amount of egg developed in ovary of the female M. alternatus trapped is 25.3.