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Davey Resource Group, Inc. <br />Tree Inventory Analysis & Maintenance Strategy <br />Page 6 <br /> Figure 3. Genera diversity of trees which make up at least 2% of the inventoried population. <br />PEST SUSCEPTIBLITY <br />Early identification of tree pests and diseases can reduce the impact of infestations on the urban forest. <br />Infestations which are caught while still limited to a small number of trees can be more easily and cost- <br />effectively managed and help prevent the further spread of the pest or disease. Since many pests and <br />diseases have preferred host tree species and genera, the susceptibility of an urban forest to a pest or <br />disease can be predicted based on its species and genus diversity. <br />Figure 4 presents the percentage of inventoried trees which are susceptible to pests and diseases of concern <br />in Minnesota. It is important to remember that this figure only represents data collected during the <br />inventory, and many more trees throughout Orono, such as those on private property, may be susceptible to <br />hosting these invasive pests. <br />63% of inventoried trees in Orono are susceptible to Asian longhorned beetle . Other pests which could <br />affect a large portion of public trees include emerald ash borer (25% of street trees and 30% of park <br />trees), and spongy moth (18% of street trees and 14% of park trees). <br />PEST SUSCEPTIBILITY RECOMMENDATIONS <br />Monitor trees for signs and symptoms of pests and diseases on a regular basis. This can be done <br />as part of other routine maintenance activities such as pruning. <br />When a pest or disease is suspected, act quickly to confirm the identification and begin <br />management. <br />27% <br />22% <br />11% <br />7% <br />5%5%4%4%3%3%3%2% <br />0% <br />5% <br />10% <br />15% <br />20% <br />25% <br />30% <br />Ash Maple Elm Spruce Oak Linden Arborvitae Pine Walnut Juniper Willow HackberryPercent of Inventoried ROW PopulationOrono Industry Recommendation <br />233