Invasives, Diseases and Pests Alerts

Viburnum Leaf Beetle Viburnum leaf beetle is a serious threat found in all CT except New London County. Highly susceptible plants are: V. dentatum complex, arrowwood viburnums V. nudum, possum-haw, smooth witherod viburnum V. opulus, European cranberrybush viburnum V. opulus var. americana (formerly V. trilobum), American cranberrybush viburnum V. propinquum*, Chinese viburnum, Taiwanese viburnum V. rafinesquianum, Rafinesque viburnum If you see it, please let Susan Munger (NL MG Coordinator) and/or CAES know. Visit UMass for a fact sheet. Visit Cornell for more information.


An adult viburnum leaf beetle. (R. Childs)

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Asian Longhorned Beetle The invasive Asian Longhorned Beetle (Anoplophora glabripennis) poses a serious threat to our New England trees. The insect has already caused extensive damage to trees in New York, Illinois, New Jersey, and Worcester, Mass. It was recently reported in Boston (July 2010). To learn more, click on this link to the UConn Home & Garden Education Center Fact Sheet. Further information on the Massachusetts outbreak. The January 2009 edition of NPDN First Detector Network News gives the latest update on this threat. Photo: Donald Duerr - USDA, Forest Service

Asian Longhorned Beetle

Garlic Mustard The herb garlic mustard (Alliaria petiolata) is classified as invasive in many habitats in Connecticut. It is a biennial, producing a rosette of green leaves in its first year of growth; a spike of white flowers appears the following year, and a single plant may produce as many as 7,900 seeds. The germinating seeds out-compete native plants, and can destroy native vegetation over large areas. Garlic mustard plants are able to inhibit the germination of nearby seeds from other species. To protect our native plants, we need to control this invasive plant. Visit for further information. Scientists Identify Weevil as Biocontrol for Garlic Mustard. Read more.