Canadian Forest Service Publications
Efficacy of the pheromone, (3Z)-lactone, and the host kairomone, (3Z)-hexenol, at detecting early infestation of the emerald ash borer, Agrilus planipennis. 2013. Ryall, K.L.; Fidgen, J.G.; Silk, P.J.; Scarr, T.A. Entomologia experimentalis et applicata 147:126:131.
Issued by: Great Lakes Forestry Centre
Catalog ID: 34759
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The invasive emerald ash borer, Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), is a major pest of ash trees, Fraxinus spp., in its introduced range in North America. Field studies were conducted to quantify the efficacy of traps baited with kairomone and pheromone lures for early detection of A. planipennis infestation. A trapping experiment demonstrated that green traps baited with the kairomone (3Z)-hexenol detected at least one adult A. planipennis in 55.3% of plots with ‘nil to low’-density infestations and in 100% of plots with ‘moderate to high’-density A. planipennis infestations. Mean trap captures increased significantly with increasing infestation density. In terms of the optimal number of traps per plot, when one (3Z)-hexenol-baited trap was placed per plot, the trap detected populations in 62% of the plots with ‘low to moderate’-density infestations through branch sampling. Detectability was increased to 82% when two traps were placed per plot. Finally, addition of female-produced (3Z)-lactone pheromone to traps significantly increased detection rates at both the trap and plot level, as compared with traps baited with the host volatile, (3Z)-hexenol, alone (88 vs. 60%, respectively). Our results are the first to demonstrate the efficacy of baited green sticky traps for detecting low-density A. planipennis infestations, particularly when the (3Z)-lactone pheromone is used. This combination is therefore recommended for development of early-detection protocols against A. planipennis.
Plain Language Summary
The objectives of this study were to develop an improved trap-lure combination for use in detecting low-density populations of the emerald ash borer. We tested the pheromone with the host volatile vs. the host volatile alone and determined that the pheromone significantly increased detection rates in low density areas. This is important because forest managers need to maximize their probability of finding populations of this damaging beetle as early as possible to implement management tactics.