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Soil compaction leading to drought like syptoms, I'd hazard a guess

I've not seen many blow over here in the UK, plenty with broken branches and boughs though..

http://www.flac.uk.com/downloads/Meripilusmonograph.pdf

I'll see what I can find Paul, one of the leading experts, is a chap called Andrew Cowan, I take you get meriplius in Canada? we have a group called the national meripilus network.. Here is a link relating to the subject http://www.aie.org.uk/trunkline/aie_tr_rooting.html

I think the mushrooms are to do with the lawn, but on a side note, we are starting to realise and understand that tree roots naturaly decompose with the help of fungi of course. These dead roots have very little ''if any'' impact on the stability or the health of the tree. Research is showing...

Gotcha, how long will the herbicide last?

Why not just use a root deflector, imo putting more chemicals into the rhizoshere, can't be good long term

Expect a lot of crown die-back on that tree, you'd have been far better off using an Air-Spade and making clean cuts with a silky root saw and loppers, just my opinion..

Not a good idea in my opinion, I have a Resistograph and I've never sealed the wholes...

I'm not so sure girdling roots are such a problem as people make out, just my thoughts..

your won't be able to detect roots rots with a Picus with Extreme

Spray [foliar fert, no weed killer or pesticide] and deep root fert, i'm very happy with the set-up, I clean the tank with a pressure washer and flush the hoses, I like the pump and the engine, no problems so far, I use a Sherril fert needle...

this is my rig , well pump and engine.. http://www.rittenhouse.ca/asp/product.asp?PG=583

I did a chelated iron/seaweed emulsion drench this week. It works well if you have bare soil or shrubs/trees growing in a flower border. If you have grass growing up to the plant not so good imo..

I heard the other day some bozo [uk arb consultant/research big shot] doesn't believe in the benefits of mulching.....:O