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File: Forestry Notes Pdf 159375 | Hireanarborist
forestry extension notes how to hire an arborist many important tree care practices what does an arborist do such as pruning watering mulching professional arborists can provide and fertilizing of ...

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                             FORESTRY EXTENSION NOTES
                                                 How to Hire an Arborist
       Many important tree care practices               What does an Arborist do?
       such as pruning, watering, mulching,             Professional arborists can provide 
       and fertilizing of young trees can be            a wide variety of technical services.  
       accomplished by the homeowner.  How-             These services include:
       ever, as trees become older and larger, 
       some these tasks, especially pruning,            Pruning- The purpose of pruning is to 
       become more difficult and potentially             promote tree health, proper tree form, 
       dangerous.  Professional arborists are           and to create a safe environment in the 
       available to assist homeowners with the          area surrounding the tree.  This is ac-
       proper care of their trees from the be-          complished by removing branches with 
       ginning of the trees life to the time they       weak V-shaped crotches, branches that 
       must be removed from the landscape.              rub together, dead branches, damaged 
                                                        or diseased branches, branches that rub 
       Arborists                                        against some part of the house or other 
       Arborists are persons that specialize in         structures, and branches that compete 
       the management and care of individual            for light.  Pruning may also be used to 
       trees.  A professional arborist is knowl-        repair damage caused by a wind or ice 
       edgeable about tree care and usually             storm, and to remove branches that 
       has formally studied in the area of              are a potential hazard to objects below 
       arboriculture, forestry, or horticulture,        them.  An arborist is trained to work 
       and/or has had extensive training in             safely with all sizes of trees.  One prun-
       the area of arboriculture through work-          ing practice a trained arborist will not 
       shops, short courses, and profession             promote is Topping.  
       societies.  Practicing Arborists perform 
       actual tree care practices, while Con-
       sulting Arborists give recommenda-
       tions but don’t actually carry out the 
       tree care procedures.  Your particular 
       situation will determine which type of 
       arborist you will need.  Information 
       contained in this brochure will focus on 
       those that perform tree care work.
       F-366/August 2005                     ...and justice for all
                                             The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, 
                                             color, national origin, gender, religion, age, disability, political beliefs, sexual orientation, and marital or family status.  
       IOWA STATE UNIVERSITY (Not all prohibited bases apply to all programs.)  Many materials can be made available in alternative formats for ADA 
                                             clients.  To file a complaint of discrimination, write USDA, Office of Civil Rights, Room 326-W, Whitten Building, 14th and 
       University Extension                  Independence Avenue, SW, Washington, DC 20250-9410 or call 202-720-5964.
                                             Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. 
       Ames, Iowa                            Department of Agriculture.  Stanley R. Johnson, director, Cooperative Extension Service, Iowa State University of Science 
                                             and Technology, Ames, Iowa.
1                                                    1
      General Care- The best way to avoid          venting construction damage to trees; 
      tree health problems is to use proper        they may also appraise the dollar value 
      care procedures.  An arborist can deter-     of trees for tax, insurance and casualty 
      mine a tree’s fertility needs, and apply     loss purposes.  Some arborists also will 
      the right fertilizer, if necessary.  An      develop a tree planting plan which may 
      arborist also can monitor the tree for       include information on species selec-
      insect and disease problems, and take        tion, type of planting stock, planting lo-
      appropriate action to manage a prob-         cation, and required post-planting care.  
      lem when necessary.  An arborist may         Planting of trees and post-planting care 
      use soil aeration equipment to improve       is sometimes carried out by arborists.
      air movement in the root zone, when 
      compaction is a problem.                     Hiring an Arborist
      An arborist will use mulch around a          *  Owning a truck and a chainsaw does 
      tree to reduce competing vegetation, re-     not automatically qualify someone as 
      tain moisture, reduce soil temperature,      an arborist.  Some door-to-door “arbor-
      improve soil structure (by increasing        ists” may claim to have noticed a tree 
      organic matter), and prevent mechani-        in your yard requiring immediate at-
      cal damage from lawn mowers and              tention.  These so-called arborists may 
      weed wips.  When trees have not been         not have you or your trees best inter-
      pruned, weak branches and double             ests in mind.  Most established arborists 
      leaders can develop.  An arborist can        are busy, and do not create new busi-
      recommend cabling and bracing tech-          ness by going door-to-door.
      niques to improve the strength of these 
      weak points.  Since trees often rise         *  Before searching for an arborist, be 
      above many of the objects in the land-       sure the tree needing work is on your 
      scape, they can be targets for lightning;    property and not on public property 
      an arborist is aware of the best methods     or in your neighbor’s yard.  Many cit-
      available to protect high value trees        ies in Iowa have ordinances that regu-
      from lightning strikes.                      late the management of vegetation on 
                                                   public property; this usually includes 
      Removal- Occasionally, a tree must be        trees in the area between the street 
      removed because it is creating a po-         and sidewalk.  Also, many cities require 
      tential hazard, is severely damaged or       arborists to be licensed to work within 
      dead, is too close to a building, or is in-  the city limits.  Inquire at city hall for 
      terfering with new construction.  Arbor-     any rules or regulations that pertain to 
      ists are trained and equipped to safely      trees and their management.
      remove trees without harming them-
      selves or surrounding property.              *  Consult the yellow pages in the tele-
                                                   phone directory for listings of arborists, 
      Consulting- Before building near estab-      under the heading Tree Service or Tree 
      lished trees, changing the grade (soil       Care.  If you have a city forester he or 
      level) around trees, or when attempting      she will have a list of arborists in your 
      to determine the value of a damaged          community.  Also, check with friends 
      tree, homeowners may wish to enlist          and neighbors for names of arborists 
      the help of a trained arborist.  Many        know for satisfactory service.
      arborists give recommendations on pre
                                                22
      *  As you make contact with arborists,         *  If time permits, obtain tree work 
      ask if they are a member of an orga-           estimates from several arborists.  Make 
      nization such as the National Arborist         sure to get a written estimate listing 
      Association, Iowa Arborists Association,       all work to be done.  Read through the 
      International Society of Arboriculture         details carefully, and be sure you un-
      or the American Society of Consulting          derstand what will be done.  The cost 
      Arborist; those organizations certify          of good tree care is not cheap.  Most 
      and/or offer continuing education and          arborists have a heavy investment in 
      training for arborists.  Membership in         equipment, labor, safety training and 
      one or all of these organizations does         insurance; a bid for a job has to reflect 
      not guarantee quality.                         many of those costs.
      *  Make sure the arborist has sufficient        *  Before the work starts, obtain some 
      insurance for personal and property            type of written contract that specifies 
      damage, and workers compensation.              what will be done, how it will be accom-
      This should include coverage for dam-          plished, and the start and completion 
      age that might occur to public prop-           dates for the job.  For example, if prun-
      erty and your neighbor’s property.  An         ing is needed, have the arborist specify 
      arborist should have a minimum of              what type and size of branches will be 
      $300,000 in general liability coverage.        removed.  Also, if any chemicals or fer-
      If you are in doubt, call their insur-         tilizers are to be used, obtain the name 
      ance company to make sure their policy         of the product, the amounts to be used, 
      is up-to-date.  There have been cases          and a list of any precautions that need 
      where the person hiring the arborist           to be taken to protect children, animals, 
      was held liable for damages, because           and personal property.  Find out if you 
      the arborist was uninsured or lacked           will be billed at an hourly rate (if so, 
      the proper coverage.  Often communi-           give a limit of hours to be used), or one 
      ties have ordinances that specify insur-       lump sum for the entire job.  Don’t be 
      ance requirements for arborists, contact       afraid to ask about anything that per-
      city hall for this information.                tains to the work to be done.  If there is 
                                                     not a written contract, write a letter to 
      *  Get references from the arborist and        the arborist specifying what you want 
      check work they have completed in the          done and be very specific.  This will 
      area.  The work that this person will do       give you some record of the work you 
      for you is important, so take time to          requested.
      look into their workmanship.  
      *  Most experienced and reputable ar-
      borists will provide a variety of servic-
      es, such as pruning, fertilizing, mulch-
      ing, cabling and bracing and removal.  
      Also, a reputable arborist will not use 
      pruning methods like topping, will 
      make the proper pruning cuts, and will 
      not use climbing spikes on trees that 
      are not being removed.  
22                                                3
      *  To help yourself when dealing with 
      arborist, be as knowledgeable about trees 
      and tree care as you can.  There are a 
      number of extension pamphlets available 
      through Iowa State University that will 
      give you good background on trees and 
      tree care.  These include:  Pm-686e Tree 
      Wound Response and Treatment, Pm-                  Proper Pruning/Thinning
      1304 Pruning Shade and Flowering Trees, 
      Pm-1387 Managing Storm Damaged 
      Trees, Pm-909 Preventing Construction 
      Damage to Trees, Pm-1429f Power Lines 
      and Trees, Pm-1429e Street Trees for 
      Iowa, Rm-1429d Low Growing Trees for 
      Urban and Rural Iowa, Pm-1429g Conifer 
      Species for Iowa, and Pm-422 Planting 
      Landscape Trees.
      When pruning, a trained arborist will 
      remove branches back to another lateral 
      branch or to the main truck like in the       Prepared by Tivon E. Feeley Forestry Extension
      picture on the right.
                                                  4
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