http://wtop.com/news/2012/09/how-dog-urine-can-kill-city-trees/
Anna Browder: Keep dogs away from young trees
This is the fall planting season for the Providence Neighborhood Planting Program. Once it's over, residents will have added many free trees to lawns and sidewalk strips all over the city. The young trees need a bit of coddling. Regular watering, mulching and weeding contribute greatly to their ongoing health. But there's one more thing we need to do for them. They must be protected from dog urine. "The acid eats right through the bark and cambial zone to the wood zone, destroying the tree's defense system."
http://m.providencejournal.com/opinion/letters-to-the-editor/20141026-an...
Dog Pee Kills Trees
Dog park politics just got a little more complicated. A recent investigation by The Atlantic Cities reports that dog pee is a major threat to the survival of urban trees. Trees in big cities face so many challenges - poor soil quality, air pollution, road salt contamination to name few - and dog pee is making it worse.
http://www.torontostandard.com/the-sprawl/dog-pee-kills-trees/
Long term problems with Tree Gators?
So, Bert, you (and others) have done research on Tree Gator-type products and found them useful in providing water to newly planted trees and shrubs. For those of you that haven’t seen supplemental irrigation products, they are heavy-duty plastic bags that zip up to create a sleeve around tree trunks and drip water from their perforated bottoms .....
http://blogs.extension.org/gardenprofessors/2009/08/05/tree-gator-problem/