Himelick, E. B. 1974. Fundamental diagnostic procedures in arboriculture. Proc. Midwestern Chapter, I.S.T.C. 29: 21-43.
To be an effective diagnostician a person should have the ability to recall information and experiences and associate these with the problem at hand. To verify the observations and diagnostic data taken, reference books and other publications often are necessary and indispensible in making a final field diagnosis. The most highly trained diagnosticians will usually refer without hesitation to one or more publications to verify their diagnosis. The art of diagnosing is acquired by a combination of training and field experience. The best diagnostician is one who is richest in knowledge, experience, and associations drawn from a multitude of tree problems with which he has had to deal. The tree or trees should be periodically examined to determine if the diagnosis was correct or incorrect. This adds to your experience, and builds confidence in your ability to diagnose.
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