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Posts Tagged ‘Massachusetts Arborists Association’

The Massachusetts Arborists Association workshop on September 10, 2009, took place on a sunny, cool day at the Mass. Hort. Society’s headquarters at Elm Bank in Wellesley, MA.

Quite a few arborists and other landscape professionals attended the workshop, which began with slide talks and then moved outside to field demonstrations.

Quite a few arborists and other landscape professionals attended the workshop, which began with slide talks and then moved outside to field demonstrations.

This workshop focused on root issues, with demonstrations of what some of those issues are — conflicts with utility lines, the effects of poor growing and planting practices, decline due to compacted and poor soils, and inappropriate tree locations — and how they may be remedied.

Rolf Briggs and Tree Specialists set up shop at a couple of different stations to show how they use air tools both to decompact soils and to excavate utility trenches near trees.  The demonstrating arborists first discussed protective equipment, and showed what  they use when they employ air tools:  We watched as they put on respirators, helmets with face masks, ear protection, gloves, and either foul weather gear or jumpsuits — all necessary to protect from the great quantities of dust, soil, and stones blowing into the air.

To protect the surrounding area from flying detritus, Mike Hickman of Tree Specialists set up plywood or screen barriers around his work zone.  I’ve seen plain plywood sheets used; the Tree Specialist guys have figured out that hinging several sheets together makes for a sturdier barrier, a good thing if you’re using air tools with any regularity in anything but a wide-open landscape.

Hinged plywood panels keep the dust contained to the area around a trench.

Hinged plywood panels keep the dust contained to the area around a trench.

When it's necessary to dig a trench near a tree, air tools can do the job while preserving the tree's roots.  You can see roots crossing this trench, but plenty of space beneath them for a new conduit or line.  This trench was blown out with an air spade, and rocks and excess loose material after the blowing-out removed by hand.

When it's necessary to dig a trench near a tree, air tools can do the job while preserving the tree's roots. You can see roots crossing this trench, but plenty of space beneath them for a new conduit or line. This trench was blown out with an air spade, and rocks and excess loose material after the blowing-out removed by hand.

The power of compressed air will break up soil move it out of the way; it can also damage roots to some extent, by blowing root bark or feeder roots entirely away.  When using an air tool, experienced operators keep the nozzle moving to limit this kind of damage, and whenever possible (definitely not always possible in trenching work), they direct the air flow parallel to the direction of major root growth, away from the base of the tree.

Note the plywood barrier inside the trench as well, to focus the air blast and prevent soil from blowing into a previously blown-out section.

Note the plywood barrier inside the trench as well, to focus the air blast and prevent soil from blowing into a previously blown-out section.

Blowing out the trench.  This air tool is a new product that uses an auxiliary stream of water to help keep the roots hydrated and the dust down.  Tree Specialists is assessing this new feature.

Blowing out the trench. This air tool is a new product that uses an auxiliary stream of water to help keep the roots hydrated and the dust down. Tree Specialists is assessing this new feature.

After blowing out a utility trench, Tree Specialists simply returns the native soil to the excavated area.  They may add some amendments such as lime or humates, if they have already had soil tests done that indicate the need for such amendments.  And to mulch the area once excavation and backfilling are complete, they have developed a proprietary mix of chipped and composted wood fibers (mainly from tree parts 3″ and less in diameter), twigs, and leaves.  They use this same mix in their soil decompaction process, and note benefits to the trees from its use.

Mike Hickman pointed out that air tools break down soil aggregates and so obliterate soil structure in the area blown out.  This breakdown can be considered a disadvantage of using compressed air for excavation; in Mike’s words, “Destruction of some of the soil aggregates I see as a “con,” but proper horticultural practices such as mulching and site specific amendments effectively mitigate these cons.”

Demonstrating arborist at this station:

Mike Hickman, Tree Specialists, Inc., Holliston, MA

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Yesterday the Massachusetts Arborists Association held a day-long workshop at Elm Bank, headquarters for the Massachusetts Horticulture Society in Wellesley, MA.  Three arborists — Dave Leonard from Kentucky, Rolf Briggs of Holliston, MA, and Matt Foti of Lexington, MA — spoke about particular  root issues; Mike Furgal, from Northborough, MA, discussed the use of air tools in bare-root tree transplanting.  After hearing the talks, the hundred or so attendees split into groups and visited five stations on the Elm Bank grounds where the featured speakers were giving demonstrations on their topics.

It was a fine workshop, and I’ll be posting quite a few photos from it in the next few days.  Today, though, I’m only posting this photo:

Sugar maple whose root flare was excavated several years ago at a Bartlett Tree workshop given to demonstrate the new and revolutionary use of air tools in tree work.

Sugar maple whose trunk flare was excavated several years ago at a Bartlett Tree workshop given to demonstrate the new and revolutionary use of air tools in tree work.

Several years ago, I went with a friend to this Bartlett Tree workshop at Elm Bank, and we were among a smallish group who watched as an arborist blew several inches of soil away from the trunk flare of this Sugar Maple.  As I recall, the tree had been planted a bit deep, it was set in a fairly compacted lawn, and it was not looking as well as it might; at the time (this was perhaps seven or eight, or perhaps even ten years ago) it had about a six-inch caliper trunk and was not thriving.

Now, however, the tree looks really good.  It may have a little too much mulch around its base — built up since its excavation — but its foliage is deep green, its bark is intact (trunk injuries sometimes show up as a result of some kind of root trauma or injury), and it certainly has grown.  A mulch bed surrounds it and keeps lawnmowers away as it minimizes compaction.  If this kind of growth results from attending to root issues early on and from maintaining a tree properly, the arborists from this workshop may prove, down the road, to be responsible for promoting what truly may be the best arboricultural practices around.

Workshop speakers:

Dave Leonard, Dave Leonard Consulting Arborist, Inc., Lexington, KY

Rolf Briggs, Tree Specialists, Inc., Holliston, MA

Mike Furgal, Furgal’s Tree and Landscape, Northborough, MA

Matt Foti, Matthew R. Foti Landscape and Tree Service, Inc., Lexington, MA

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Here’s a quick post to alert readers to the Massachusetts Arborists Association‘s Special Seminar and Demonstration on air tool use. A team of four arborists — Mike Furgal, Matt Foti, Rolf Briggs, and Dave Leonard — will be showing how compressed-air tools can be used in arboricultural work (root forensics, bare-root planting, bare-root transplanting, shrub moving, etc.), and will discuss the advancements that this technology provide those working with or using woody plants in the landscape.

The seminar will be on September 10 at Elm Bank, the Massachusetts Horticultural Society’s property in Wellesley, MA — check the MAA link above for registration information.

Registration is not limited to arborists, so interested landscape architects and contractors can go and see this work. I highly recommend signing up; last year’s seminar at Matt Foti’s farm, where Mike Furgal debuted the air-tool transplanting method, was really outstanding, and this year there’s bound to be even more information available and a great deal of informed and informative discussion.

One point: Bare-root transplanting, either with an air-tool or by root-washing, may never replace other methods of transplanting. But for specimen tree transplanting, where the value of an existing tree merits the effort involved, it is currently the gold standard. The number of roots retained with bare-root transplanting prevents the tremendous stress caused by other methods, and should be considered a valuable tool in the kit available to landscape architects, arborists, and contractors.

Bare-rooting allows for the moving of a tree this large in less than one day...

Bare-rooting allows for the moving of a tree this large in less than one day...

...while preserving this much root mass.

...while preserving this much root mass.

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