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<br />Davey Resource Group, Inc. <br />Tree Inventory Analysis & Maintenance Strategy <br />Appendix A <br />Summary of Recommendations <br />SECTION RECOMMENDATION <br />Species & Genera Diversity <br /> Avoid or limit planting of green ash and increase planting of other <br />species until green ash make up less than 10% of public trees. <br /> Avoid or limit planting of ash and maple and increase planting of <br />other genera until ash and maple make up less than 20% of public <br />trees. <br /> Remove volunteer trees that have invasive tendencies, such as <br />boxelder, from maintained public areas while small. <br /> Increase planting of uncommon species and genera which are well <br />suited to urban environments. <br />Pest Susceptibility <br /> Monitor trees for signs and symptoms of pests and diseases on a <br />regular basis. This can be done as part of other routine <br />maintenance activities such as pruning. <br /> When a pest or disease is suspected, act quickly to confirm the <br />identification and begin management. <br /> Prepare an invasive species management plan to guide the <br />response to future pest or disease infestations. <br /> When planting trees, select pest- or disease-resistant species or <br />cultivars whenever possible. <br /> Use preventative pesticide treatments on high-value or historic <br />trees that are susceptible to problematic pests and/or diseases in <br />Minnesota. <br />Condition <br />● Dead and dying trees should be removed as soon as possible in <br />priority order from highest to lowest risk to reduce public hazards, <br />create space for new planting, and improve the appearance of <br />Orono’s streets and parks. <br />● Trees in Poor condition not recommended for removal should be <br />maintained to reduce risk associated with defects and should be <br />routinely monitored for further decline that would necessitate <br />removal. <br />● Condition ratings can be improved over time by instituting <br />proactive maintenance cycles such as routine pruning and young <br />tree training. All tree pruning should follow ANSI A300 (Clause 5) <br />guidelines. <br />Relative Age Distribution <br />● The City of Orono’s park and street trees are young. Orono should <br />focus on tree pruning and proactive care for these young and <br />established trees, and a maintenance plan should be implemented <br />to ensure that the young and established trees can mature while <br />retaining good health and proper form. <br />● A large proportion of street trees are young or established (53% of <br />street trees and 28% of park trees). A young tree training cycle <br />should be instituted to structurally prune these younger trees to <br />ensure good form and improve health as they mature. <br />42