The invention discloses a Monochamus alternatus attractant which comprises a plant-derived pheromone and an aggregation pheromone. The plant-derived pheromone comprises the following components in parts by volume: 60-75 parts of turpentine or alpha-pinene, 18-30 parts of ethanol, 0-5 parts of guaiacol and 0-5 parts of 4-methyl guaiacol. The aggregation pheromone is 10-100 mu L/lure 2-undecyloxy-1-ethanol. The application method comprises the following steps: the plant-derived pheromone is released by a slow-release bottle, wherein radial bulge lines are arranged in the cap of the slow-release bottle, the slow-release bottle is prepared from low-density polyethylene (LDPE) with the density of 0.910-0.925 g/cm<3>, and the wall thickness of the slow-release bottle is 0.20-0.70mm; the aggregation pheromone is released by a slow-release bag, wherein the slow-release bag is prepared from LDPE with the density of 0.910-0.925 g/cm<3>, and the wall thickness of the slow-release bag is 0.04-0.15mm. The average trap quantity per week of each Monochamus alternatus attractant is up to 59.01; the drug effect can stably stay for 2 months or so; and thus, the Monochamus alternatus attractant can greatly lower the population density of Monochamus alternatus and inhibit the pine wood nematode disease from propagation and transmission.