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Wasp found in upstate New York shows up in Southern California
Date:1/24/2012

RIVERSIDE, Calif. In August 2010, an entomologist at the University of California, Riverside discovered a tiny fairyfly wasp in upstate New York that had never been seen in the United States until then. Nearly exactly a year later, he discovered the wasp in Irvine, Calif., strongly suggesting that the wasp is well established in the country.

Called Gonatocerus ater, the wasp is about 1 millimeter long and arrived in North America from Europe. It lays its eggs inside the eggs of leafhoppers.

Leafhopper females lay their eggs inside plant tissue. Gonatocerus ater females find these eggs and lay their own eggs inside them. When the wasp eggs hatch, the larvae eat the leafhopper eggs.

"This wasp was accidentally introduced in North America," said Serguei Triapitsyn, the principal museum scientist in the Department of Entomology and the director of the Entomology Research Museum, who made the discovery. "It most likely got here in parasitized eggs of the leafhoppers in twigs of Lombardy poplar seedlings coming from Europe, perhaps long ago."

Triapitsyn explained that the wasp had been reported in Italy where the leafhopper Rhytidodus decimaquartus was determined to be its host.

"In California, we do not know if the wasp's host is this leafhopper, but I found it on the same Lombardy poplar trees that had the wasp, so an association is very likely," he said.

Triapitsyn found the wasp on August 7, 2011, when he was doing field work along a trail. He caught the insects in a net that he had swept over Lombardy poplar leaves. He preserved the sample of insects in ethanol and brought it to his lab at UC Riverside for analysis and identification, which can take long. He got a positive identification of the potential leafhopper host only two weeks ago.

"I identified the wasp as Gonatocerus ater by c
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Contact: Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050
University of California - Riverside
Source:Eurekalert  

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Wasp found in upstate New York shows up in Southern California
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