Abstract: Japanese pine sawyer Monochamus alternatus Hope is a dangerous insect of conifer trees in Asia, and a main vector of pine wood nematode Bursaphelenchus xylophilus, the causal agent of destructive pine wilt disease. In this paper, the research progress on the chemical ecology of M. alternatus was reviewed, aimed to provide a brief overview on the interactions between M. alternatus and host plants, intraspecific interactions of M. alternatus, and interactions between M. alternatus and B. xylophilus. In the interactions between M. alternatus and host plants, the volatile terpenes of host plants play an important role in regulating the feeding and ovipositing ofM. alternatus adults. The compositions of the terpenes and their relative contents have large variations between healthy and damaged host plants, and M. alternatus has a significant sexual bias response to some of the volatiles. In addition to the volatiles, the carbohydrate, amino acid, phytosterol, phospholipids, and flavone in host plants can act as stimulants or repellents to regulate the feeding and ovipositing behaviors of M. alternatus. Sex pheromone is hypothesized in the forms of contact pheromone and short or longrange sex pheromones that initiate the reproductive behaviors such as attraction, courtship, mounting, and copulation, etc. The ovipositiondeterring pheromone originated from female reproductive gland or hindgut can deter gravid females ovipositing on oviposition scars occupied by eggs or larvae, which is confirmed to be helpful in spacing eggs and reducing the mortality in early larval stages due to conspecific competition. Chemicals such as monoterpenoids, CO₂, and unsaturated fatty acid produced by host plants, sawyer beetle, and pine wood nematode could be the basis of chemoecological relationship between pine wood nematodes and their vector insects. These chemicals control the behaviors of nematode’s assembly to pupae chamber, and its entering in or divorced from insect body. Future research directions on the chemical ecology of the M. alternatus were also discussed.

Key words: Larix principis-rupprechtii, Canopy interception, Model