Effect of semiochemicals and trap height on catch of Neocerambyx raddei in Jilin province, China

We conducted experiments in Jilin, China, in 2011 and 2014 in forest stands dominated by mature Quercus mongolica Fisch. ex Ledeb. (Fagaceae) to test the effects of longhorn beetle pheromones, plant volatiles, and trap height on catch of Neocerambyx raddei (Blessig & Solsky) (formerly Massicus raddei) (Coleoptera: Cerambycidae) in traps. Traps captured 276 specimens of N. raddei in 2011 and 379 specimens in 2014 (384 females, 271 males). Ethanol was attractive to female but not male N. raddei. However, N. raddei was not attracted to any of the longhorn beetle pheromones tested, which included racemic 3-hydroxyhexan-2-one, racemic 3-hydroxyoctan-2-one, syn-2,3-hexanediols, anti-2,3-hexanediols, racemic E, Z-fuscumol, racemic E, Z-fuscumol acetate, and monochamol, nor was it attracted to 2-methyl-3-buten-2-ol. Traps placed in the tree canopy captured significantly more beetles than did traps in the understorey. Our results suggest that surveys for N. raddei should use ethanol-baited traps placed in the tree canopy. If sex or aggregation pheromones are identified for N. raddei in the future, we predict that attraction to them will be enhanced by the presence of ethanol.