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Old 06-20-2012, 05:51 PM
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RigglePLC RigglePLC is online now
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herbicide vs too hot

I tested several herbicides on my neighbor's vacant lot. Temps were about 94. Non-irrigated. I wanted to see if injury to the grass might result.
Five types of herbicide. I sprayed with small squirt bottles or hand sprayers.
One second, 3 seconds, and 5 seconds.

Stay tuned.
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Old 06-20-2012, 06:57 PM
grassmasterswilson grassmasterswilson is online now
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Can't wait to see this. Let us know about turf injury and weed I jury.
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Old 06-20-2012, 07:22 PM
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Patriot Services Patriot Services is online now
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Question. Why the time interval instead of measured amout that could be easier to upsize to real app rates?
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Old 06-20-2012, 07:26 PM
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cgaengineer cgaengineer is offline
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I have found that even in Georgia heat, 24d is pretty forgiving on Bermuda...other grass types may vary.

I did turn a Bermuda lawn a bit toasty last week...a nice golden brown with a hint of green. Told the customer he had to water, my guess is he waited for rain...oh well, not my problem.
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Old 06-20-2012, 07:40 PM
greendoctor greendoctor is online now
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The heat restrictions are very true and what happens when products are applied to open fields with no irrigation. Maintaining turf in my area without irrigation is a no go. If I could not spray above 80 or 85, that would rule out the entire year for me. Only time it is not 85 is if it is raining or extremely windy.

Broadleaf weed controls like Banvel or Speedzone have not caused any harm to even sensitive lawns if they are irrigated according to my specifications.
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Old 06-21-2012, 09:41 PM
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Young Bros Young Bros is offline
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Keep us posted. It will be interesting to hear the results. Greendoctor, do you ever experience volatilization with the ester base speed zone?
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Old 06-21-2012, 10:07 PM
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I tested 5 kinds of herbicide for injury at high temperatures. On grass consisting of blue/rye/fine fescue. No sign of any injury so far, after 48 hours. Killed a few weeds. We had about 10 minutes of rain this morning. And the weather cooled from over 90 to to about 70. Rain less than a tenth of an inch.

The spray covered about a 10 inch diameter circle; that is one-half square foot. I will find the ounces per second delivered, and let you know.
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Old 06-22-2012, 04:13 AM
greendoctor greendoctor is online now
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Quote:
Originally Posted by Young Bros View Post
Keep us posted. It will be interesting to hear the results. Greendoctor, do you ever experience volatilization with the ester base speed zone?
I have, and that is on days I have no business spraying, much less being outside. 90 degrees, high humidity and no wind. Perfect conditions for my heat intolerance to kill me and ester herbicides to steam distil off a lawn affecting nearby trees or flowers.
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Old 06-22-2012, 10:47 PM
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I applied five kinds of herbicide to see if any would cause injury on a hot day, 94 degrees.
After 72 hours--no sign of injury.
I found that the squirt bottle-type sprayer took 40 trigger pulls to apply an ounce, and therefore applied 1/40 of an ounce at the low rate. I applied it to a half of a sqft. I used most of the weed solutions at one-ounce per quart. The method is crude, but calculations show I applied about 1.5 ounces herbicide per thousand sqft at the low rate.
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Old 06-28-2012, 03:43 PM
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frotis frotis is offline
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When Speedzone says not to apply when temps are 85 or above. It is safe to apply if the temps are 75 that day, and going to be 90+ all the following days?
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