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Too hot for glyphosate
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reddirtwheatfarmer
Posted 6/23/2012 14:18 (#2445426)
Subject: Too hot for glyphosate


Weatherford, OK
At what temp to glypho become ineffective?
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boog
Posted 6/23/2012 16:40 (#2445604 - in reply to #2445426)
Subject: Re: Too hot for glyphosate



spray a couple hundred acres earlier this week with temps 90 - 93ยบ. I could see weeds starting to turn yellow in 3 days. Will see if they continue to die
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Red/Green
Posted 6/23/2012 16:50 (#2445616 - in reply to #2445604)
Subject: Re: Too hot for glyphosate


Elizabethtown,KY
I always heard that it is good to spray in the mornings and quit by noon when it is this hot, as the weeds take in the Roundup better when it is cooler. My custom sprayer did my last 200 acres this week, he sprayed in mornings and the weeds and grass are already turning yellow.
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boog
Posted 6/24/2012 00:03 (#2446268 - in reply to #2445616)
Subject: Re: Too hot for glyphosate



I quit around 3:00 though our chemical dealer said not to worry about it
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emtbd1979
Posted 6/23/2012 16:48 (#2445612 - in reply to #2445426)
Subject: Re: Too hot for glyphosate



west central illinois
I do not spray once it gets above 90. Seems the weeds do not respond well above that temp. I usually start early morning and then quit around noon if I need to or soon after.
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farmerboy50
Posted 6/23/2012 16:52 (#2445621 - in reply to #2445612)
Subject: +1


West Texas
Especially if the humidity is low!
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Shawn michigan
Posted 6/23/2012 20:24 (#2445926 - in reply to #2445426)
Subject: Re: Too hot for glyphosate


AS long as you have moisture for them to grow good we haven't seen a problem. But when it is dry heat matters. The weeds shut down in the hottest weather and wont take up the roundup.
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SteigerSt320
Posted 6/24/2012 09:44 (#2446611 - in reply to #2445426)
Subject: Re: Too hot for glyphosate


Northeast Louisiana
I agree with Shawn michigan, as the plant "shut down" to battle the heat. It close it's "pores" in the leaves to retain its moisture in plant to survive. As it cool down, the pores will open back up. Thus allowing for intake. If you have good moisture and growing good when its hot, you should get a good kill. But if it's dry and hot during mid-day. It's harder to kill. Foliar feeding works the same way. I have done alot of foliar feeding cotton in eary am to achieve results.
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