Abstract: The Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say), is one of the most notorious insect pests of potato. Because of its serious resistance to pesticides, an alternative control of CPB is desperately needed. In order to develop an effective attractant for trapping CPB, the behavioral responses of CPB to seven plant-derived volatiles, eight odorous blends, and CPB aggregation pheromone were tested by the Y-tube olfactometer. Field trapping was further conducted based on the results of laboratory behavioral bioassays. The results of laboratory behavioral bioassays showed that 2-phenylethanol was attractive to both sexes. While male beetles were strongly attracted to a three-component blend ［comprised of (Z)-3-hexenyl acetate + linalool + methyl salicylate］ (81.67%), females showed low attraction (63.33%). The addition of aggregation pheromone to the three-component blend increased the attraction percentage of both male (88.33%) and female beetles (83.33%), and reduced the difference between the responses of sexes. The results of field tests indicated that the combination of the pheromone and the blend of three-component plant volatiles exhibited the highest attraction to CPB in the field. So these results provide a basis for the use of the pheromone and plant volatiles as a component of forecast and control of the CPB.  

Key words: Leptinotarsa decemlineata, plant volatiles, aggregation pheromone, behavior response, attraction