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Old 07-09-2013, 12:23 PM
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RigglePLC RigglePLC is online now
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herbicide in dark

Do herbicides work better in the dark. Have you ever wondered?
So...I sprayed two different products Speedzone and a generic 3-way ready-to-use, using small bottle sprayers. I applied the solutions to three different weed species and applied the first treatment at 8:45 in the evening. The second was applied the following day.

Neither product worked well on violets, day or night. Both products worked well on clover, day or night.
The night treatments worked a little better when applied to Oxalis.

I am thinking the higher humidity of the evening helped the effectiveness.
Maybe if I had a way to test the effectiveness under differing humidity conditions...I would find out more.
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Old 07-09-2013, 03:19 PM
macgyver_GA macgyver_GA is offline
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Quote:
Originally Posted by RigglePLC View Post
Do herbicides work better in the dark. Have you ever wondered?
So...I sprayed two different products Speedzone and a generic 3-way ready-to-use, using small bottle sprayers. I applied the solutions to three different weed species and applied the first treatment at 8:45 in the evening. The second was applied the following day.

Neither product worked well on violets, day or night. Both products worked well on clover, day or night.
The night treatments worked a little better when applied to Oxalis.

I am thinking the higher humidity of the evening helped the effectiveness.
Maybe if I had a way to test the effectiveness under differing humidity conditions...I would find out more.
I would imagine that the dew would help keep the herbicide on the target weeds much better.
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Old 07-10-2013, 09:09 PM
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Think Green Think Green is offline
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Riggle,
With our usual 75% relatuve humidity days and nights followed with 100 degree temps, I am sure the weed will open the stomata at night in safety from the blistering sun.
I obtain excellent control either way it seems.

Are you referring to light degradation if used in the daytime?'
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Old 07-11-2013, 07:48 PM
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RigglePLC RigglePLC is online now
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For the second time. I treated Oxalis in day time and for comparison a few hours later at night.
The night treatments were slightly more effective in my opinion, Speedzone was more effective than a three-way product.

First two photos: day a 3-way ,day Speedzone.
Bottom pictures: night a 3-way, night Speedzone. Hat for contrast.

The same test on ground ivy had almost no effect from any product. Temps were about 80, soil slightly dry.
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Old 07-11-2013, 08:13 PM
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Think Green Think Green is offline
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Riggle, I get what you are saying. Oxalis seems to be affected better at night after the application compared to the other specimens.

I sprayed a variety of weeds in my own lawn this evening with 0.367 oz. of Solitare to one gallon of water with 0.5 oz of MSO. The evening temp here is 97 with o wind at 6:30 p.m.
Full sun lawn on common bermuda.
I'll let you know how the weeds faired.
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Old 07-12-2013, 05:59 PM
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clemsonturf clemsonturf is offline
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herbicides always perform better at higher rates of photosynthesis...
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Old 07-12-2013, 09:48 PM
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Think Green Think Green is offline
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I am sorry for not posting my pictures Riggle,
I guess my photos is too large to display on the forum, and I don't feel like uploading and sizing right now.
I obtained .75 percent burndown of oxalis within 24 hours use of Solitare.
I obtained complete curl and .50 percent burndown of dandelion.
I obtained .75 percent burndown of prostrate spurge.
I obtained .75 percent burndown and curl of lespedeza.

all done with 0.0625 oz of Solitare with 0.5 oz of MSO. Temperature's was 97 degrees if memory serves me with .75 % humidity. Sprayed in the evening around 6:30. In one gallon of water per K through a backpack sprayer with fan tip.
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