Old 07-19-2013, 08:16 AM
ArTurf ArTurf is online now
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Herbicide penetration

Do herbicides get better penetration early in the morning vs late evening?
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Old 07-19-2013, 10:12 AM
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foreplease foreplease is offline
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There is probably research on this. I don't know but my opinion is whatever conditions favor best contact with the target plant will produce the best results. Using a spreader sticker is an important practice that will increase effectiveness. I don't spray every day or even every week so I can be picky about when I make applications. Wind - finding a calm time - is usually my first criteria. I have sprayed many athletic fields between the hours of 10 pm and 2 am with great results. Honestly, I find most herbicides to be quite forgiving if the equipment is calibrated well and range of label rates is met. I am more concerned with not damaging desirable grasses or, worse, nearby plants than with how well or how fast weeds are taken out. that seems to take care of itself if I deliver the chemical to the plant as carefully as possible.

I know this does not address your question, exactly. I will be interested in what others think.
Michigan PABL
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Old 07-19-2013, 11:27 AM
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basically depends on the temp if it's to cold or to hot the uptake is slowed so if it's cold in the morning it's probably better to wait until later when it's warmed up and the opposite if it's going to be hot better to do it early before it gets to hot
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Old 07-19-2013, 03:59 PM
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Old 07-19-2013, 09:08 PM
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translocating herbicides work better during the day. Foliar burning herbicides work about anytime. Root and stem herbicides work better during ample conditions.
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