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What is an Arborist?

An arborist is someone who, through education and training is qualified to practice
arboriculture. Arboriculture is the application of standards and techniques developed to
improve the condition of shade, ornamental and fruit trees. Practices include pruning,
cabling, bracing, fertilization, aeration and the control of insects and diseases. The
arborist is knowledgeable about the typical growth habits and preferred site location and
conditions of healthy trees and is able to diagnose problems from the obvious insect
infestation to the less obvious environmental stresses such as changes in soil grade or
drought that may affect tree health.
An arborist license, issued by the Department of Environmental Protection, is required
to practice arboriculture for hire in The State of Connecticut.
For more on DEP's arborist licensing process - please visit www.dep.state.ct.us/wst/pestcert/arborist/arborist.htm
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How do I become a licensed Arborist? |
To see a list of ten things you can take to prepare yourself for the Arborist
Exam, click here.
To view a flyer for a recent session of Arboriculture 101,
click
here.
 | Examinations are held quarterly by the Tree
Protection Examining Board, under the direction of the Department of the Environmental
Protection (DEP). In order to be examined by the Tree Protection Examining Board,
you must first pass a written exam given by DEP. You must file an application with the
department at least 30 days prior to the exam date. You will receive a notice of exam to
be presented at the testing site. |
 | Contact: Linda Schmidt
Pesticide Division - Department of Environmental Protection
1-860-424-3369 |
 | License holders are required to obtain a minimum of 12 continuing education credits
within a 5 year period. The Department will notify the license holder to submit evidence
of the credits during the fifth year. These credits are submitted to the Department of
Environmental Protection for review and certification. |
Applicants are expected to be proficient in the following areas:
Diagnosis. An applicant should:
 | Be able to identify all common trees found in the region in summer and winter
conditions. |
 | Know the normal healthy form of the tree, its appearance and rate of growth under normal
and abnormal conditions and its usual life span. |
 | Know the suitability of trees to different sites. |
 | Know the factors involved in maintaining the tree in good health and appearance in order
to anticipate and prevent damage from various causes. |
 | Understand the functions of the various parts of the tree, such as bark, leaves, wood,
roots, etc., and be able to determine if these functions are being properly performed. |
 | Recognize the symptoms of and agents responsible for any injuries, abnormalities and
weaknesses. These agents include insects, animal pests, fungal, bacterial and viral
diseases, unsuitable soil, wind, frost, snow and ice, gas and fumes and know the relative
susceptibility of different tree species to these agents. |
Treatment, an applicant should be able to prescribe and perform proper treatment
and must be knowledgeable of:
 | Arboricultural practices including various methods of pruning, bracing, cabling and
tools used. Treatment of girdling roots and wounds. |
 | The basic chemical elements essential to tree life and growth, how obtained and absorbed
and which are likely to be deficient. The significance of fertilizer formulations and
availability and the significance of soil pH on tree growth and nutrient availability. |
 | When and how to control insects and disease. When pesticides are required, know proper
dosage, type of material to use within state and federal regulations. The relative
toxicity of various materials and safe combinations. Thorough understanding of Integrated
Pest Management (IPM), how and when to perform. |
Operational Practice, an applicant should know:
 | Safety rules to be followed in tree work to protect workers, the public and property. |
 | Types of insurance that protect tree workers, the public and property. |
 | Safe sprayer operation and proper methods for applying pesticides. |
Exam Preparation 
Organizations and training materials:
 | Connecticut Tree Protective Association, "Arboriculture
101" - contact: Chris Donnelly,
Secretary-Treasurer, phone 203-484-2512
|
 | Connecticut Cooperative Extension Service, "Pesticide Applicator Training
Manual" phone 860-570-9010
|
 | Connecticut Agricultural Experiment Station, "Disease Management Guide for
Connecticut Arborists" and "Pesticide Guide toward IPM for Connecticut
Arborists" Available through the CTPA.
|
 | Tree Care Industry Association,
www.treecareindustry.org
phone 603-673-3311
|
 | International Society of Arboriculture,
www.isa-arbor.com
phone 217-355-9511 |
References:

 | Hartman, John R.; Pirone, Thomas P. & Lee, Mary Ann "Pirone's Tree Maintenance,
7th edition". Oxford University Press N.Y., N.Y. 10016 |
 | Dirr, M.A. "Manual of Woody Landscape Plants. Stipes Publishing Co., New York, N.Y.
10036 |
 | Johnson, W.T. and H.H. Lyon, "Insects that Feed on Trees and Shrubs". Cornell
University Press, Ithaca, N.Y. 14850 |
 | Forest Service "A Guide to Common Insects and Diseases of Forest Trees in the
Northeastern United States" Department of Agriculture, State and Private Forestry,
370 Rees Rd., Broomall, PA 19008 |
 | Taylor, Norman "Taylors Guide to Trees" Houghton Mifflin Co., 2 Park
St., Boston, MA 02108 |
 | "Pest Management Recommendations for Commercial Production and Maintenance of Trees
and Shrubs", Cornell Cooperative Extension, Cornell University, B-15 Wing Hall,
Ithaca, NY 14853 |
The Arborist Law
 | Sec. 1. Section 23-61a: (a) As used in sections 23-61a to 23-61f,
inclusive, as amended by this act, "arboriculture" means any work done for hire
to improve the condition of fruit, shade or ornamental trees by feeding or fertilizing, or
by pruning, trimming, bracing, treating cavities or other methods of improving tree
conditions, or by protecting trees from damage from insects or diseases or curing these
conditions by spraying or any other method; "arborist" means one who is
qualified to perform arboriculture and is licensed by the Commissioner of Environmental
Protection as provided in section 23-61b, as amended by section 2 of this act;
"board" means the State Tree Protection Examining Board established under
subsection (b); "fungicide" means any substance or mixture of substances
intended for preventing, destroying, repelling or mitigating any fungus;
"fungus" means any non-chlorophyll-bearing thallophyte; that is, any
non-chlorophyll-bearing plant of a lower order than mosses and liverworts; for example,
rusts, smuts, mildews, molds and yeasts, except those on or in any living human or other
vertebrate animal; "herbicide" means any substance or mixture of substances
intended for preventing, destroying, repelling or mitigating any weed; "insect"
means any of the numerous small invertebrate animals generally having the body more or
less obviously segmented, for the most part belonging to the class Insecta, comprising
six-legged, usually winged forms, as for example, beetles, bugs, bees, flies and to other
allied classes of arthropods, whose members are wingless and usually have more than six
legs, as for example, spiders, mites, ticks, centipedes and wood lice;
"insecticide" means any substance or mixture of substances intended for
preventing, destroying, repelling or mitigating insects; "plant regulators"
means any substance or mixture of substances determined to be a plant regulator under
Chapter 441; "pesticide" means any substance or mixture of substances determined
to be a pesticide under said chapter; "weed" means any plant that grows where it
is not wanted.
(b) There shall be in the Department of Environmental Protection a State Tree
Protection Examining Board which shall consist of the plant pathologist and forester of
the Connecticut Agricultural Experiment Station, who shall serve as ex-officio members,
and five electors of the state, three of whom shall be public members, and two of whom
shall be licensed, practicing arborists to be appointed by the Governor. Any vacancy in
the appointed membership of the board shall be filled by the Governor for the unexpired
portion of the term.
(c) The board shall have a seal and, in the proceeding in court, a certificate
under such seal shall be bona fide evidence of any proceeding or action by or before the
board stated in such certificate. A majority of members acting as a board shall constitute
a quorum for the transaction of business.
(d) Repealed
(e) The Commissioner of Environmental Protection, with the advice and assistance of
the board, may adopt such regulations as are necessary for the purpose of giving
examinations, issuing and renewing licenses, inspection of work or revocation of licenses.
Sec 2. Section 23-61b:
(a) No person shall advertise, solicit or contract to do arboriculture within this
state at any time without a license issued in accordance with the provisions of this
section, except that any person may improve or protect any tree on his own premises or on
the property of his employer without securing such a license provided such activity does
not violate the provisions of chapter 441, subsection (a) of section 23-61(a), this
section or section 23-61d. Application for such license shall be made to the Commissioner
of Environmental Protection and shall contain such information regarding the applicant's
qualifications and proposed operations and other relevant matters as the Commissioner may
require and shall be accompanied by a fee of twenty-five dollars which shall not be
returnable.
(b) The Commissioner shall require the applicant to show upon examination that he
possesses adequate knowledge concerning the proper methods of arboriculture and the
dangers involved and the precautions to be taken in connection with these operations,
together with knowledge concerning the proper use and application of pesticides and the
danger involved and the precautions to be taken in connection with their application. If
the applicant is other than an individual, the applicant shall designate an officer,
member or technician of the organization to take the examination, which designee shall be
subject to the approval of the Commissioner except that any person who uses pesticides in
arboriculture shall be licensed to do arboriculture or shall be a licensed commercial
applicator under chapter 441. If the extent of the applicant's operations warrant, the
Commissioner may require more than one such member or technician to be examined. If the
Commissioner finds the applicant qualified, he shall issue a license to perform
arboriculture within this state. A license shall be valid for a period of five years. If
the Commissioner finds that the applicant is not qualified, or if he refuses to issue a
license for any other reason, he shall inform the applicant in writing, giving reasons for
such refusal.
(c) The Commissioner may issue a license without examination to any nonresident who
is licensed in another state under a law that provides substantially similar
qualifications for licensure and which grants similar privileges of licensure without
examination to residents of this state licensed under the provisions of this section.
(d) Each licensee shall pay a license renewal fee of one hundred and fifty dollars
for each renewal. All examination and license renewal fees shall be deposited as provided
in section 4-32, as amended, and any expenses incurred by the Commissioner in making
examinations, issuing certificates, inspecting tree work or performing any duties of the
board shall be charged against appropriations of the General Fund.
(e) Each licensee shall maintain and, upon request, furnish such records concerning
licensed activities as the Commissioner may require.
(f) The Commissioner may suspend for not more than ten days and, after notice and
hearing as provided in any regulations established by the Commissioner, he may suspend for
additional periods, or he may revoke, any license issued under this section if he finds
that the licensee is no longer qualified or has violated any provision of sections 23-61a
to 23-61d, inclusive, as amended by this act, or any regulation adopted thereunder.
(g) The Commissioner of Environmental Protection, in consultation with the board,
shall establish standards for examining applicants and reexamining applicators with
respect to the proper use and application of pesticides and agricultural methods. Such
standards shall provide that in order to be certified, an individual shall be competent
with respect to the use and handling of pesticides or the use and handling of the
pesticide or class of pesticides covered by such individual's application or certification
and in the proper and safe application of recognized arboricultural methods.
(h) Any licensed arborist shall be considered to be a certified applicator under
section 22a-54 with respect to the use of pesticides.
Sec. 3. Section 23-61f:
(a) Any person who violates any provision of subsection (b), (c) or (d) of section
23-61b, as amended by this act, or section 23-61d or of any regulation issued under
subsection (e) of section 23-61a, as amended by this act, shall be fined not more than two
hundred dollars.
(b)Any person who violates any provision of chapter 441 or sections 23-61a to
23-61d, inclusive, as amended by this act, shall be considered under the jurisdiction of
the Commissioner of Environmental Protection.
(c) Any person who violates any provision of subsection (a) of section 23-61b, as
amended by this act, or section 23-61d shall be assessed a civil penalty of not less than
one thousand dollars but not more than two thousand five hundred dollars for each day such
violation continues. The Attorney General, upon complaint of the Commissioner, shall
institute a civil action in the Superior Court for the Judicial District of Hartford-New
Britain to recover such penalty. Any such action shall have precedence in the order of
trial as provided in section 52-191.
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