First samurai wasps found in Switzerland
Research conducted in the course of the EU-funded project BINGO has led to the discovery that Trissolcus japonicas, a natural enemy of H. halys, is already present in apple orchards in the Canton Ticino, in south-eastern Switzerland. This is the first time that T. japonicus, commonly known as the samurai wasp, was recovered from H. halys egg masses in Europe. A paper published in the Journal of Pest Science provides details on this discovery.
"It is difficult to say for certain how Trissolcus japonicus arrived in Switzerland – the 2mm big wasp was probably accidentally transported from its native range along with the pest," says co-author Dr. Tim Haye in a news item posted on the EurekAlert! website. "But whether Switzerland was the actual country of introduction or whether the wasp was introduced into the climatically highly-suitable northern Italy before spreading northwards remains unclear," adds Dr. Haye, who is also a researcher at project partner Centre for Agriculture and Bioscience International.Read more at: https://phys.org/news/2019-01-europe-samurai-wasps-bug-eggs.html