Canadian Forest Service Publications

Effects of pheromone release rate and trap placement on trapping of Agrilus planipennis(Coleoptera: Buprestidae) in Canada. 2015. Ryall, K.; Silk, P.J.; Fidgen, J.; Mayo, P.; Lavallée, R.; Guertin, C.; Scarr, T. Environmental Entomology 44(3):734-745.

Year: 2015

Available from: Great Lakes Forestry Centre

Catalog ID: 36231

Language: English

CFS Availability: PDF (request by e-mail)

Available from the Journal's Web site.
DOI: 10.1093/ee/nvv048

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Abstract

The emerald ash borer, Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), is a devastating insect pest in its introduced range. A trapping system that increases trap catches or detection rates in low-density populations would be beneficial for survey programs. Five trapping experiments were conducted to investigate factors influencing capture rates of male beetles on dark green traps baited with the A. planipennis pheromone, (3Z)-dodecen-12-olide ((3Z)-lactone), plus the green leaf volatile, (3Z)-hexenol. Low doses (0.001–1.0 mg) of (3Z)-lactone + (3Z)-hexenol did not consistently increase captures of male A. planipennis. In other experiments, mean captures of males were significantly higher on traps baited with a moderate dose (3.0 mg/septum) of (3Z)-lactone + (3Z)-hexenol, compared with lower doses (0.001, 0.1, and 1.0 mg) or (3Z)-hexenol alone. Next, we demonstrated that addition of (3Z)-lactone to traps baited with (3Z)-hexenol resulted in significantly greater increases in male captures when pairs of traps were placed on the same tree, than when traps were placed on adjacent trees. Moreover, significantly more A. planipennis were captured on pheromone-baited traps placed in the southern versus northern aspect of the crown. These results highlight the importance of experimental set-up for elucidating lure treatment effects and also suggests the (3Z)-lactone may be more active at close range. Our findings increase our understanding of the pheromone ecology of this species and lend support toward the use of dark green traps baited with 3.0 mg (3Z)-lactone + (3Z)-hexenol deployed in the south aspect of the canopy for detection programs for this insect.

Plain Language Summary

The emerald ash borer (EAB) is a devastating insect pest in its introduced range. A trapping system that increases trap captures or detection rates in low density populations would be beneficial for survey and management programs. A series of field trapping experiments were conducted to investigate factors influencing capture rates of male beetles on dark green traps baited with the EAB pheromone, (3Z)-dodecen-12-olide ((3Z)-lactone), plus the green leaf volatile, (3Z)-hexenol. Very low doses (< 1.0 mg) of (3Z)-lactone + (3Z)-hexenol did not consistently increase captures of male A. planipennis. Moderate doses (3.0 mg) of (3Z)-lactone + (3Z)-hexenol captured the highest number of beetles in very-low density populations. Next, we demonstrated that the addition of (3Z)-lactone to traps baited with (3Z)-hexenol resulted in significantly greater increases in male captures when pairs of traps were placed on the same tree, than when traps were placed on adjacent trees 20-25 m apart. Moreover, significantly more A. planipennis were captured on pheromone-baited traps placed in the southern vs. the northern aspect of the crown of the same ash trees. These results highlight the importance of experimental set-up for detecting lure treatment effects and also suggest the (3Z)-lactone may be more active at close range. Our findings support the use of dark green traps baited with a binary blend of 3.0 mg (3Z)-lactone + (3Z)-hexenol deployed in the south aspect of the tree canopy for detection programs for this destructive insect pest.

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