4.5. SR 05-20-2013 - Laserfiche WebLink

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Executive Summary Emerald Ash Borer(EAB) is an exotic pest introduced to the U.S. from Asia. It was first detected in Detroit in 2002, although based on the population level at that time; it is speculated to have first arrived in the 1990's. Since being discovered in the U.S., it has spread to 18 states as well as into Canada. EAB was found in St. Paul, MN in May of 2009 and several months later in the cities of Minneapolis and Falcon Heights. In 2012, EAB was detected in Ramsey County. Major Travel Corridors coming from quarantined counties enter and border our community: US Hwy 10 out of Ramsey County and through Anoka County to Sherburne County, US Hwy 101 and I-94 out of Hennepin County. The primary method of spread is not natural movement of the insect but rather via firewood infestation. The proximity of Elk River to these roadways place the ash trees at a high risk. The pest attacks and kills all species of ash trees (Fraxinus spp). Ash trees were heavily planted throughout the city, especially during and since Dutch Elm Disease and Oak Wilt mortalities. Once detected in an area, EAB populations are often high and at damaging levels. Based on the experience of hundreds of communities that are mitigating the impacts of EAB, Elk River can expect significant mortality of ash trees 8— 10 years after infestation. Most infestations are not detected until affected trees show symptoms that become evident approximately 3 years after infestation. Early detection is critical in order to implement actions that may reduce EAB populations. The impact of EAB is more manageable over a longer period of time and eases the day to day pressure on available resources. Ramifications associated with this level of tree loss are costly and will be recognized in the city budget through negative environmental impacts, aesthetic degradation and decreased property value. The forest canopy assessment is a key component of this plan and will help identify the best management practices to implement. Examples of such practices include but are not limited to: pre-emptive removals of low value ash (improperly placed, structurally defective or hazard, small diameter (< 3") ash trees or those causing damage to infrastructure); chemical treatment of high value ash, diversification of canopy through annual planting, and early detection through regular monitoring and survey work. Ash Management Management techniques are based on the latest available information and recommendations from leading state agencies (Minnesota Department of Agriculture, Minnesota Department of Natural Resources, and the University of Minnesota). Techniques may be altered as EAB situation evolves and new technologies become available. EAB Community Preparedness& Management Plan -Page 3