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Attraction of Halyomorpha halys (Hemiptera: Pentatomidae) haplotypes in North America and Europe to baited traps

Morrison, William R. III, Milonas, Panos, Kapantaidaki, Despoina Evr., Cesari, Michele, Di Bella, Emanuele, Guidetti, Roberto, Haye, Tim, Maistrello, Lara, Moraglio, Silvia T., Piemontese, Lucia, Pozzebon, Alberto, Giulia Ruocco, Short, Brent D., Tavella, Luciana, Vetek, Gabor, Leskey, Tracy C.
Scientific Reports 2017 v.7 no.16041 pp. 1-11
Halyomorpha halys, aggregation pheromones, bait traps, haplotypes, imagos, indigenous species, invasive species, monitoring, Greece, Hungary, Italy, Maryland, South East Asia, South Korea, Switzerland
Halyomorpha halys is a global invasive species native to Southeast Asia that is threatening agriculture in invaded regions. While pheromone-based monitoring tools for H. halys have been validated in North America and South Korea, their efficacy has not been widely evaluated in Europe. Our goals were to: 1) establish the attractiveness of semiochemical stimuli paired with field-deployed traps in Europe (Greece, Hungary, Italy, and Switzerland), compared with Maryland, USA, and 2) identify H. halys haplotypes recovered from traps at each location. We found qualitatively identical patterns of captures between sites located across Europe and in Maryland, USA. In both regions, captures of H. halys adults indicated a synergistic response to traps baited with the two component H. halys aggregation pheromone, and pheromone synergist, methyl (2E, 4E, 6Z)-decatrienoate when compared with either individually. Nymphal captures were significantly greater in baited traps compared with unbaited traps in both regions, though a synergistic response was not observed likely due to the patchy nature of localized nymphal populations. Haplotype diversity in Europe based on trapped specimens was much greater than the USA, with five new haplotypes described here, probably indicating ongoing invasion and re-introduction of H. halys. By contrast, a single, previously identified haplotype was trapped in Maryland, USA, representing a single introduction. All H. halys haplotypes responded to each semiochemical in apparent proportion to their frequency in the overall population based on independently derived information from prior work. Taken together, we confirm that this pheromone-based technology will be of global utility for the monitoring of this important invasive species.