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Davey Resource Group, Inc. Tree Inventory Analysis & Maintenance Strategy Page 7 Prepare an invasive species management plan to guide the response to future pest or disease infestations. When planting trees, select pest- or disease-resistant species or cultivars whenever possible. Use preventative pesticide treatments on high-value or historic trees that are susceptible to problematic pests and/or diseases in Minnesota. Figure 4. Susceptibility of the tree resource to pests and diseases of concern in Minnesota. CONDITION During the inventory, each tree was assigned a condition rating based on several factors, including root characteristics; branch structure, trunk, canopy, and foliage condition; and the presence of pests or disease. Tree condition was rated as Excellent, Good, Fair, Poor, and Dead. Figure 5 provides the condition rating breakdown for street and park trees in Orono. Most trees were in Good or Fair condition (78%). 11% of the street trees and 5% of park trees were in Poor or Dead condition. 5% of the street trees and 8% of the park trees were in excellent condition. Within the provided data set, three trees were not assigned a condition rating and were not added to Figure 5. CONDITION RECOMMENDATIONS ●Dead and dying trees should be removed as soon as possible in priority order from highest to lowest risk to reduce public hazards, create space for new planting, and improve the appearance of Orono’s streets and parks. 14% 30% 63% 18% 25% 64% 0% 10% 20% 30% 40% 50% 60% 70% European spongy moth Emerald ash borer Asian longhorned beetle Percent of Inventoried Trees SusceptibleInvasive Pests with a Regional PresenceParks Streets 2%2% 15%12% 57% 30% 20% 47% 5%8% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Streets* ParksPercent of Inventoried Trees*Three street trees were not assigned a condition rating Dead Poor Fair Good Excellent Figure 5. Condition ratings of street trees. 19