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Tree Azin injection
When we moved to Guildwood a few years ago, we were attracted by its mature canopy. The streets wind through urban forest, and many existing trees were preserved when the homes were first built fifty years ago. It did not occur to us that all five of the tall trees on our new property were white ash - and that they would face a deadly threat.


We soon found out about the Emerald Ash Borer and realized there was a very real possibility that we could lose all of these in a few seasons. Initially we were distressed. But as we learned more about the threat, it seemed we might not be so helpless after all.


Ash Canopy in decline


First, we planted through LEAF’s backyard tree planting program - ensuring that new trees were there to eventually take the place of the ash. We also attended information sessions by LEAF that led us to consider having our trees inoculated against the EAB. 


Initially we were sceptical. The cost seemed high, and treatment would not guarantee our trees would survive. However, the more we considered our options, the more we were compelled to try.


Do nothing, and the trees were doomed. In as little as two years we could be faced with the cost of removing five large trees. And worse, EAB can leave ash structurally unsound posing a safety risk - and more costly removal.  Do something, and we might extend the life of of these trees. With treatment we would spread out removal costs and buy time for our new trees to grow. Although TreeAzin must be reapplied every two years, it still seemed more appealing than giving up.


Ash Tree


We wanted to save the trees if possible - we loved their cooling shade in the summer. More pragmatically, we knew our property value was part of the equation as well.


The manufacturer of TreeAzin lists licensed applicators, so we began making phone calls and decided on Forest Glenn Tree Care.


Cost is based on the diameter of the tree, so Forest Glenn visited us in the spring to take measurements and prepare a written quote. Once we chose to proceed we were eager. But with TreeAzin there is a window in the early summer that must be met for optimal results. Eventually we got the call: the trees would be treated the next day. A good watering of each tree was recommended. This would ensure flow was moving through the trees, which would help draw the insecticide up.


Glenn, the arborist, began by drilling small holes around the base of each tree. In each hole a small nozzle is tapped. Attached to each nozzle is a pressurized capsule filled with the orange liquid. It looked like the reverse of tapping maple trees for syrup. According to Glenn, the liquid is often drawn up quickly, but on this day it took several hours for the trees to take the full dose. We created a short video documenting our experience.


Tree Azin injection on an ash tree

Some of our neighbours dropped by to ask questions. One had already treated a few trees in their yard. Another decided on the spot to treat the ash on their property and Glenn was happy to look into it right away.


It's nice to know our street is acting to save the canopy. Now we wait. Our decision may be a bit of a gamble, but for us it was one worth the risk.


Holly Pagnacco and Husband Chris live in the Guildwood neighbourhood in eastern Toronto. It holds the highest concentration of ash trees in the city. First introduced to LEAF on the EAB Tree Tour, the pair has been volunteering and educating their community about EAB ever since.



Hi,I am in despiarate needof information, on the presurized tubes used in the inoculation process, we are citrus Farmers in Florida, and faceing a very serious problem, wit asian leaf greening, it may wipe out all citrus world wide, I am wanting to inoculate A test study of trees, using Achromycin injection, This is what they are doing in asia to prevent the desease. but here in the usa There are no studies being dont to prevent this. here is a link, to what I am trying to accomplish here. thanks, I hope you can give me some info, on the presurized tubes used, thank you very much, John Gilmore

Hi John,

I hope you are able to accomplish what you've set out to do - and that you'll keep us posted. I would recommend reaching out to the company behind TreeAzin, Bioforest. I would think that they might be able to get you some answers.

Best of luck!

Hi Guys, Great post and well done. Your story is very similar to ours, on Wingate Drive in Ottawa. We organized to have 16 50+ year old trees on our street treated at the end of June. It was a ton of work to organize but we got it done. Your closing statement says it exactly! Best of luck! Simon Wilson Ottawa

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