Exotic Pest Reporting
Christine Buhl, Oregon Department of Forestry, Bugwood.org
Green alder sawfly
Green alder sawfly (Monsoma pulveratum) is an insect pest of Alder trees. It is a native of Europe and North Africa and was first detected in Alaska in 2009.
By quickly defoliating the Alder tree host, this pest poses a serious threat to riparian areas where the alder contributes to nitrogen-fixing of the soil.