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Davey Resource Group, Inc. Tree Inventory Analysis & Maintenance Strategy Page 19 Figure 11. Removal recommendations for Poor condition trees. ROUTINE PRUNING CYCLE The routine pruning cycle includes all trees with a condition rating of Fair, Good, and Excellent. Over time, routine pruning can minimize reactive maintenance, limit instances of elevated risk, and provide the basis for a robust risk management program. DRG recommends a five-year routine pruning cycle (see side panel, “Proactive Pruning”) to maintain the condition of the inventoried trees. However, this is not always possible based on budgetary constraints, the size of the inventoried tree population, or both. In these cases, extending the length of the routine pruning cycle is an option; however, best practice is to not exceed a 10-year pruning cycle. Tree condition has been shown to deteriorate significantly after 10 years without regular pruning as once-minor defects worsen, reducing tree health and potentially increasing risk. A total of 3,862 trees in streets and parks were rated as condition of Excellent, Good, and Fair and should be included in a routine pruning cycle (Figure 12). ROUTINE PRUNING CYCLE RECOMMENDATIONS  Orono should aim to prune 1/5 of its public trees each year during a five-year routine pruning cycle. A five-year cycle would see around 482 street trees and around 290 park trees assessed and pruned, if needed, each year.  Young trees (1-6”) which grow out of the young tree training cycle (see next section) should also be included in the routine pruning cycle. 10 30 64 59 17 18 6 1 1 18 51 163 110 48 20 10 7 3 0 20 40 60 80 100 120 140 160 180 1-3" 4-6" 7-12" 13-18" 19-24" 25-30" 31-36" 37-42" >43"Recommended Poor Condition RemovalsSize Class Park Street 31