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Historical Accounts.............. 5 Tree Features Influencing.pdf

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Historical Accounts.............. 5 Tree Features Influencing

15 TREES AND ICE STORMS THE DEVELOPMENT OF ICE STORM– RESISTANT URBAN TREE POPULATIONS ContentsSummary 2 Introduction 3 Historical Accounts 5 Tree Features Influencing Ice Storm Susceptibility 6 Tree Features Influencing Ice Storm Resistance 7 Ice Storm Damage in Wooded Areas 8 Ice Storm Damage Manage- ment and Prevention 9 References 121 Richard J. Hauer, Mary C. Hruska, and Jeffrey O. Dawson. 1994. Trees and ice storms: The development of ice storm–resistant urban tree populations. Special Publication 94-1, Department of Forestry, University of Illinois at Urbana-Champaign. Urbana, IL 61801. 12pp. Funding for this publication was provided by the technology transfer program of the USDA Forest Service Urban Forestry Center for the Midwestern States. Graphic Designer: Lynn Hawkinson Smith Illustrator: M.R. Greenberg Technical Editor: Molly Bentsen Photo credits: Cover—Reprinted with permission of Joel Dexter; pages 2, 5, 6, 7, 10, 11—Michael R. Jeffords; page 4—(l. to r.) Mary Hruska, Joel Dexter, Michael Brunk, Jim Skiera; pages 8, 9, 12—Lynn Hawkinson Smith The authors gratefully thank Robert Brush, Gina Childs, Robert Miller, and George Ware for their constructive reviews and comments. 2SUMMARY S evere ice storms occur every year in the United States,particularly in the midwestern and eastern regions, result-ing in millions of dollars in monetary losses. Tree species vary in their resistance to ice accumulation. Certain charac- teristics, such as “included” bark, dead and decaying branches, a broad crown, and fine branching, increase a tree’s susceptibility to ice storm damage. Planting trees resistant to ice storms and performing regular tree mainte- nance to remove structural weaknesses will reduce damage caused by severe ice storms. Management plans for urban trees should incorporate information on the ice storm sus- ceptibility of trees to limit potential ice damage, to reduce hazards resulting from ice damage, and to restore urban tree populations fol