Investigation on Population Dynamics and Generations of Monochamus alternatus in Longli Forest Farm of Guizhou Province

Field traps and luring logs for adults of pine sawyer beetle, Monochamus alternatus were set during May and November of 2016 and 2017 at 3 sample plots in Longli Forest Farm of Guizhou province. The result demonstrated that the occurrence of adults had peaks from June to August. Female adults were trapped more than males with male/female ratio of 1:1.72, and emergence of females was earlier than that of males. Beetles at Pinus armandii were more trapped than at P. massoniana. ZM-60 had best efficiency among tested traps. Three generations within 2 years of M. alternatus were concluded by peak occurrence and effective accumulated temperature. Survey result of luring pine wood logs in 2017 also suggest that the pine sawyer beetle could be able to finish three generations in two years.