New areas will complement existing areas of competency in mortgage insurers, tree valuation, tree-preservation orders and qualified tree-risk assessments.
"Each of the new areas represents a separate route to professional member status of the society," said a representative.
"Firstly, we have a new expert witness area of professional competency, he said of a series of seminars due to start in early December.
Dates for a new computer-aided design for arborists' course that satisfies British Standards are to be announced shortly, he added.
Finally, the society is to focus on lightning protection, with a talk by the inventor of the Arborbolt lightning-conductor tool, Ben Feust.
Chairman David LLoyd-Jones said:
"Ben will deliver his insights so that consultants and contractors can specify and install his advanced tree lightning protection systems."
"Promoting our members and the services they offer is the main reason our society exists."