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Old 05-02-2014, 09:32 PM
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Caution on Herbicide sprayed in desirable tree dripline

I looked at a couple weedkillers labelsand both caution about spraying in drip line of trees. That would seem to limit spraying in a lot of places?

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These are the two labels I looked at so far. Will they all have the same caution?
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Old 05-02-2014, 10:07 PM
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Probably--dicamba kills by root uptake. Three-way labels all include the warning; they never include more than about 1/8 pound per acre of dicamba. Do not mix it double strength.
Redbud trees are especially sensitive. Sometimes box elder.
The risk is much higher if (for instance) it rains and the treatment is repeated.

Years ago a nice lady complained to me about how tough it was to kill poison ivy. "Nothing will kill that stuff and its growing up the side of my cottonwood tree!" It was my rookie year.
So I sprayed it for her. "Don't know if this will work." I sprayed the poison ivy ten times.
You guessed it--a few days later the manager mentioned that the customer called; the tree was dead, as was the poison ivy.
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Old 05-02-2014, 11:04 PM
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I would add on...be esp careful around evergreens. Give a wide berth.
Imprelis did me in on more than a few of those.
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Old 05-03-2014, 03:46 PM
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Most of the trees are large live oak, burr oak and pear. So that is probably the reason TruGreen usually didn't get the weeds under big trees. So what do you do about those weeds?
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Old 05-03-2014, 04:26 PM
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Sulfentrazone. It is now approved for use in containerized, field, and landscape woody plants. You would never apply a conventional broadleaf killer there. My soils are usually so impervious that I have to really over do the Banvel or 4 Way to get in trouble. On the other hand, the rare yard that is all sand causes me to be careful.
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Old 05-03-2014, 04:55 PM
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Quote:
Originally Posted by greendoctor View Post
Sulfentrazone. It is now approved for use in containerized, field, and landscape woody plants. You would never apply a conventional broadleaf killer there. My soils are usually so impervious that I have to really over do the Banvel or 4 Way to get in trouble. On the other hand, the rare yard that is all sand causes me to be careful.
Except Imprelis, that stuff violated all of the above rules.....
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Old 05-03-2014, 05:17 PM
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Only herbicide with similar properties is Tordon. I am still amazed, knowing how well aminocyclopyrachlor would work on trees, that it was ever approved for use in residential areas.
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Old 05-03-2014, 07:39 PM
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Quote:
Originally Posted by greendoctor View Post
Sulfentrazone. It is now approved for use in containerized, field, and landscape woody plants. You would never apply a conventional broadleaf killer there. My soils are usually so impervious that I have to really over do the Banvel or 4 Way to get in trouble. On the other hand, the rare yard that is all sand causes me to be careful.
Our soils certainly not sandy but would irrigation watering likely cause speedzone to get into tree roots system quicker? Second question do most herbicides degrade from sun light over a short time?
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Old 05-03-2014, 09:10 PM
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root absorption

Carfentrazone is more of a contact of green tissue herbicide--I don't think it has any root activity.
Most 3-ways with dicamba have been used (with caution) under trees for years without a problem. Under ordinary conditions I had no problems.
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Old 05-03-2014, 09:24 PM
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Quote:
Originally Posted by RigglePLC View Post
Probably--dicamba kills by root uptake. Three-way labels all include the warning; they never include more than about 1/8 pound per acre of dicamba. Do not mix it double strength.
Redbud trees are especially sensitive. Sometimes box elder.
The risk is much higher if (for instance) it rains and the treatment is repeated.

Years ago a nice lady complained to me about how tough it was to kill poison ivy. "Nothing will kill that stuff and its growing up the side of my cottonwood tree!" It was my rookie year.
So I sprayed it for her. "Don't know if this will work." I sprayed the poison ivy ten times.
You guessed it--a few days later the manager mentioned that the customer called; the tree was dead, as was the poison ivy.
Yea but you did what the customer wanted right?
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