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  #11  
Old 05-03-2014, 10:30 PM
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ed2hess ed2hess is online now
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weed-b-gon

Seems they have no caution about tree drip line?

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  #12  
Old 05-04-2014, 02:53 AM
greendoctor greendoctor is online now
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Originally Posted by ed2hess View Post
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?
Not any more than lawns dependent on rainfall. If anything, ideal conditions are where I am the only one supplying water to the grass. All bets are off when there is a 2" per hour rain storm no matter what the soil texture is. I normally plan on an application several days before irrigation.

Some do and others are fairly persistent even when exposed to the sun. The more persistent ones are useful as preemergents or as total vegetation killers. On that Triclopyr amine herbicide: do not try to use that on any warm season grass other than zoysia. Low rates of Triclopyr will kill many weeds Dicamba is aimed at with less risk of uptake through the roots.
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  #13  
Old 05-04-2014, 02:55 AM
greendoctor greendoctor is online now
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Originally Posted by RigglePLC View Post
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.
Stay under the 1/8 lb rate and never under a tree on sandy soil. Carfentrazone is contact only and not persistent in the soil at all. Sulfentrazone has enough soil activity to make it usable as a preemergent.
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