[MAIPC] Ailanthus and Basalbark Treatment
John Ambler
john.ambler at verizon.net
Wed Aug 12 08:33:05 PDT 2015
Several years ago on the maipc listserve there was a comment that ailanthus becomes brittle when dead and dry, and then it can be dangerous to cut. The recommendation was to cut it before then. Does anyone have information on how soon it should be cut to prevent this? One month?
With adequate drill-and-fill treatment with glyphosate concentrate, there can be little regrowth from root suckers. But around female trees the small trees are likely to be from seeds. Adequate drill-and-fill treatment: 1 mL 40-50% glyphosate with or without surfactant per inch in diameter in the growing season, 2 mL per inch in diameter for very large trees and in the dormant season. Drilling is easiest and deepest on the trunk & roots near the ground.
-----Original Message-----
From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Richard Gardner
Sent: Wednesday, August 12, 2015 10:51 AM
To: MAIPC; Patricia Greenberg
Subject: Re: [MAIPC] Ailanthus and Basalbark Treatment
I prefer Drill and Fill instead because it uses less chemical, safer tools and less spillage.
With a cordless drill, drill a 3/8" hole 1" deep every 2" of girth at comfortable working height. Spray in 50.2% glyphosate (purple cap Roundup) with a spray bottle. Within 2 weeks the tree will be defoliating. Check the tree after 6 weeks for green bark by scraping between the holes with a knife to make sure the tree is dead. If not check it again in a few weeks. I know that they are dead within 6 months, probably sooner.
Once you are sure the tree is dead, cut it down or it may break at the drill holes in a heavy wind.
One sure way of knowing the tree is dead or near dead is to look for white tubes of frass from holes in the bark made by the ambrosia beetle Euwallacea validus.
Richard Gardner
--------------------------------------------
On Wed, 8/12/15, Patricia Greenberg <pgreenberg at reston.org> wrote:
Subject: [MAIPC] Ailanthus and Basalbark Treatment
To: "MAIPC" <maipc at lists.maipc.org>
Date: Wednesday, August 12, 2015, 10:30 AM
Hi Everyone,
Tree of Heaven is a big
problem in Reston. Due to the make-up of our open space, in many areas surrounding recreational facilities and homeowner property, we cannot leave dead looking standing trees for months at a time. Residents complain
and it reduces the “curb appeal” that the Association is trying to improve.
I would like your input on
this matter. When applying Triclopyr in a basal bark treatment, how long does the tree need to stay before we can cut it down? (2 months? 6 months?)
In certain cases, I think
we’ll be forced to do a cut stump treatment instead.
We typically use glyphosate at 20% on the stump. How problematic is this method with Ailanthus? I know it can be effective in killing the large tree but then
we have runners to manage.
Thanks for sharing your
thoughts,
Patricia
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Patricia Pearl
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(703) 435-6552
pgreenberg at reston.org
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