The Bartlett sales rep seems to be operating on the premise that any new roots will then have lots of time to become established before next summer places a heavy demand on the root system. But what has he done to promote root growth other than loosening the soil? After root invigoration and
macro fertilization the tree will respond with a lovely new flush of top growth and the "after" picture will make the tree look like its on the road to recovery.
It very well may be.
but...
It is this arborist's opinion that cambistat along with soil fracturing/aerating and mulch to promote root density
could be a better treatment for long term health over short term cosmetics. Likely cheaper as well. Ask your arb. rep. about this option.
http://treecarescience.com/uploads/marketing materials PDFs/SMPLInjured_Roots_SS.pdf
Remember. The good doctors at the BTR lab develop the science. It's up to their sales reps to accurately apply it in the field. The following is from the BTE patent for their root invigoration process. "1. A method of improving existing rooting soil around a plant comprising the steps of: selecting a portion of the existing rooting soil surrounding the plant as a first improvement zone; loosening the existing rooting soil in the first improvement zone with an air excavator which releases compressed air at supersonic speed, to a depth of around 6 to 8 inches below ground level"... "the treatment being selected from the group consisting of: organic matter, fertilizer, mycorrhizae fungi, a soil conditioner,
and combinations thereof; and maintaining the treated existing rooting soil within the first improvement zone."
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http://www.freepatentsonline.com/6845587.html
A tremendous tool for trees in compacted soil but Is this the best remediation for root damaged trees? Root damaged trees in compacted soil? Root damaged trees in compacted low fertility soil? Could very well be. I was not there so I can only help you make an informed decision.
Any pruning of live wood removes much needed foliage and creates wounds but maybe your arb rep has a very good reason for the pruning.
Often pruning is used in conjunction with bracing to lighten loads. That decision has to be determined on site.
I hope all this info helps, Good luck