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The ambermarked birch leafminer (AMBLM) (Profenusa thomsoni ) is an invasive leafminer native to the Palearctic from the United Kingdom to Turkey to Japan. It was introduced to the eastern United States in 1921 and has since spread to the mid-western U.S. states and Canadian provinces. This leafminer was introduced to Alaska in 1996, where it has since spread over 140,000 acres, from Haines to Fairbanks. The most severe damage is found throughout the Anchorage bowl, which extends south to Girdwood and North to Wasilla. The damage caused by P. thomsoni can be severe, defoliating entire trees. In 2006, it was noted that urban areas in Alaska experienced higher densities of AMBLM leafminer than adjacent forested areas....
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The ambermarked birch leafminer, Profenusa thomsoni Konow (Hymenoptera: Tenthredinidae), was first discovered in Alaska in 1991 but was not correctly identified until 1996 when it invaded Anchorage and became a widespread and damaging pest to forest and urban birches. In 2003, the parasitoid wasp, Lathrolestes thomsoni Reshchikov (Hymenoptera: Ichneumonidae), was selected as a candidate for a classical biological control program against P. thomsoni. Parasitized leafminer larvae were collected from the Northwest Territories and Alberta, Canada, where it was previously introduced and causing injury to Betula spp., and transferred to Alaska in soil as pre-pupae for emergence. From 2004 to 2008, 3636 adult L. thomsoni...
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The ambermarked birch leafminer, Profenusa thomsoni Konow (Hymenoptera: Tenthredinidae), was first discovered in Alaska in 1991 but was not correctly identified until 1996 when it invaded Anchorage and became a widespread and damaging pest to forest and urban birches. In 2003, the parasitoid wasp, Lathrolestes thomsoni Reshchikov (Hymenoptera: Ichneumonidae), was selected as a candidate for a classical biological control program against P. thomsoni. Parasitized leafminer larvae were collected from the Northwest Territories and Alberta, Canada, where it was previously introduced and causing injury to Betula spp., and transferred to Alaska in soil as pre-pupae for emergence. From 2004 to 2008, 3636 adult L. thomsoni...
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