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The City of Bismarck Forestry Division is beginning the tree injection program to manage European Elm Scale (EES) on Monday, May 24. A limited number of trees will be treated and areas for treatment were selected where elm trees are highly concentrated.
The European elm scale (Eriococcus spurius, previously Gossyparia spuria) is a scale insect introduced to North America. This insect feeds on elm trees by sucking sap from branches and leaves. This insect only effects elm trees. Heavy infestations can cause stunted, chlorotic foliage, premature leaf drop, and branch die-back. These scales produce large amounts of sticky honeydew; infested branches and leaves can become black with sooty mold growth. EES is a very difficult pest to control and if left unchecked, large branches will begin to die back and the elm trees will begin to have significant decline.
The treatments will be performed by trunk injection, directly applying the insecticides into the cambium of the tree. This method delivers the product to the target insects, greatly minimizing exposure to non-targeted animal or plant species. Only insects that puncture the trees to feed are subject to this insecticide.
For more information, visit https://bismarcknd.gov/1399/Common-Pests-and-Diseases or call 701-355-1700. All injection activities are subject to weather conditions.