[CANUFNET] Basswood treated for spongy moth caterpillar control

[Elaine Ethier]

Hello,

Thank you for updating the information and knowledge transfer. I must question the purchasing and licensed professional requirements for TreeAzin.

I’m I wrong to think that a practicing arborist must be certified and trained to buy, handle, transport, drill as well as inject this targeted systemic pesticide ?

Could there be other species or specimens not described and/or not pathologically referenced, signs and/or symptoms possibly caused by un assessed parasites be described on the ´Caution when using’ notices ?

TreeAzin is a powerful chemical, in the above mention case, it seems it was misused. The results of punction holes by drilling into the Tillia at a wrong time of season using an inappropriate product are creating unwanted diseases and portrays unprofessional images to the field of some worthy practitioners.

Elaine Ethier
Plani Gester
Aménagement, foresterie urbaine

Le 6 sept. 2022 à 09:41, Iola Price via CANUFNET <canufnet at list.web.net> a écrit :


Hello people - I posted the question about the basswood and early leaf drop on behalf of a friend who had had the tree injected with Tree Azin.  At the time I told my friend that I would ask professional foresters if the treatment might have caused the leaf drop but that, in my non-professional opinion, Tree Azin was not the problem but summer heat and drought might be candidates.
My friend reached out to BioForest/Lallemand and Elsa Cousineau immediately visited the property and looked at the tree in question.  She then posted a reply which went only to me and should have gone to the entire CANUFNET group.  So, here in its entirety, is Elsa Cousineau's response.  And it mirrors other replies received.  Tree Azin was not the problem.  Iola Price

Good morning Iola,


Hope you’re doing well! I had a feeling you might have heard of these basswoods! I’ve just come from visiting the property this morning and can share my thoughts.

 For some context, the property owner reached out to BioForest/Lallemand Plant Care asking if there could be a negative reaction following a TreeAzin injection.

In our professional experience, and since TreeAzin has become available in 2008, we have never seen a tree react negatively immediately following an injection, nor have we heard of a tree suffer from a phytotoxic reaction.


Upon hearing of these basswoods, our main concern was that these trees were injected pre-bloom! TreeAzin’s label clearly states that all injections must be conducted post-bloom, meaning once the flowers have dropped, to reduce the risk to pollinators. Basswood trees bloom late in the season and at a time when spongy moth larvae are no longer active. Therefore, spongy moth treatments should never be conducted on any tilias.


Having seen these trees, I can attest that most are in good condition, despite their age: they are quite mature, and some are showing signs of decline not uncommon with trees that size (cankers, rot pockets, dead limbs, etc.). Some are showing signs of a bacterial wetwood infection at the injection sites, but bacterial wetwood, also known as slime flux, should not be a contributing factor to canopy decline. A neighbouring mature basswood that was not treated is also showing signs of early leaf senescence.


Some of my colleagues across the province have noticed that some trees are showing signs of early leaf senescence this year—perhaps a delayed reaction to some of the droughty summers we’ve experienced over the past few years.



It’s really a shame that these trees were unnecessarily injected, and that they are showing signs of decline, but I can’t say that the two are directly related.  I hope the owner is able to work with an experienced arborist to give them the care and maintenance they deserve.



Thanks, and talk soon,

Elsa

Elsa Cousineau
Spécialiste Technique – Technical Specialist
Arboricultrice certifiée de l’ISA – ISA Certified Arborist ON-2215A, TRAQ
Lallemand Plant Care
[Receiver outline]+1 647 529 0453    [Envelope outline]   ecousineau at lallemand.com<mailto:ecousineau at lallemand.com>
[Marker outline] Ottawa, ON, Canada
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