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i try to tell everyone(not talk their head of of course)about why it is important to hire a certified ISA arborist and why topping tree's is a bad thing and only an ISA certified arborist will be able to service every tree need.
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Well.............you ought to be able to sell tree work without having to include lies in your sales pitch!
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No 2 CA's are created equally, nor any other tree workers. Some people choose not to become or not continue to be a CA for different reasons. This is not indicative of their skill sets.
A qualified individual is a qualified individual.
Not to stir the Code of Ethics pot, but CAs topping (aside from habitat trees, or was that not included) and spike pruning are parts of the Ethics that the ISA was trying to enforce (professional practices up to industry standards).
A CA cert is only a basic certification that requires continuing education credits.
You're thoughts are in the right place to a degree, but I would suggest that you point to the ANSI (a300?) standards of practice.
I would suspect that most CAs, including myself, have the least skill of the all the testing domains in pests and treatment, along with fertilization "needs" and proper application.
As arborists, we should train our weaknesses as much or more than our strengths.
I'd suggest a photodocumentation of good and bad practices that should be sought and avoided, rather than telling the customer that CAs are the only ones to be able to do it all.
Offer the good and bad, then what you will do, with some before's and after's of your work, as well.
You know that pictures speak a thousand words (or more).
You may like to use ISA or other publications/ pamphlets to present your case more effectively.
Best of luck with presenting yourself and educating your potential client bases.
Speaking with gardening clubs, etc, as you will likely have read on TB is a good public dispersal of knowledge, and way of helping to prevent the implimentation of poor practices and fear-based decision making.