Laserfiche WebLink
3 <br />▪Galleries exposed under bark splits <br />▪Blonding of the bark <br />▪Serpentine galleries and “D” shaped exit holes <br />▪The presence of EAB or larvae <br />▪Canopy dieback <br />▪Begins in the top one-third of canopy <br />▪Progresses until the tree is bare <br />▪Increased woodpecker activity <br />▪Sprouting of epicormic shoots from the base of the tree <br />Management Strategy <br />Treatment for EAB consists of two primary methods, chemical treatments to prevent ash <br />trees from becoming infested and removal ash trees. Chemical treatments can be further <br />broken down into three primary categories; soil drenches, stem injections, and granular <br />treatments. Of these, granular treatments and soil drenches can be done by the property <br />owner; however the effectiveness of these treatments is limited and both of these treatments <br />can have negative impacts on groundwater, stormwater, and non-target species. Stem <br />injections have shown to be effective for up to three years; however these treatments are <br />cost prohibitive on a large scale with current estimates ranging from $7-$11 per diameter <br />inch of stem at 4.5 feet above the ground and must be conducted every three years to <br />protect the tree. <br />Due to the financial unfeasibility of chemical treatments for publicly owned trees, this <br />management plan will focus on the physical removal of ash trees. The number of public <br />trees removed in any given year will be dependent upon the amount of human and financial <br />resources available. The Street and Park Maintenance Divisions will conduct removals of <br />publicly owned trees as time allows. Tree removals will generally take place from September <br />to March each year. This period ensures that adult beetles have already emerged and <br />transporting of infested wood will not further spread EAB to other areas of the city. <br />Street and Park Maintenance Division staff will work systematically throughout the city <br />conducting removals of ash trees. Based on population growth models for EAB, it is <br />anticipated that 80% of ash trees will die within the next 4-6 years throughout the city which <br />requires an average removal rate of 175-225 public trees per year. Due to this condensed <br />timeline and the hazards posed to public and private property from dead trees, staff will <br />work through neighborhoods removing all public ash trees regardless of their current <br />infestation status. This approach will be the most cost effective while ensuring the necessary <br />staff and equipment resources are available. <br />Public trees are determined to be trees located within public road rights-of-way, city owned <br />stormwater ponds and outlots, city campuses, and city parks. Staff will utilize plat <br />documentation and measurements to determine the edge of the road rights-of-way and <br />determine if the tree is public; trees will be determined public if all or part of the tree’s stem <br />is within the right-of-way. Residents, at their own expense, may hire a surveyor to mark <br />their property boundaries and determine tree ownership if they dispute the city’s assessment. <br />Page 48 of 464