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How long for roundup to work?

Updated: 9/15/2023
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12y ago

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Glyphosate (the active ingredient in the product with the trade name of "Roundup") normally has to have enough time to translocate (move around) in the plant in order to begin inhibiting photosynthesis. This will typically be around two to three weeks for the plant to visually appear dead. However, plant growth and development is essentially halted within just a day or two for susceptible weed species. Remember, glyphosate does not kill all weeds, just most of them.

Remember to always read, understand, and follow all label instructions on any pesticide before attempting to use it. If in doubt, please contact a qualified applicator, county agent, or state department of agriculture.

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How does Roundup ready seed work?

To oversimplify it, a gene is inserted into the plant that keeps the plant from metabolizing glyphosate (roundup).


What temperature does it need to be for Roundup to work?

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What is the low temp roundup will work?

To get the best results from Roundup, it should be applied when the daytime temperatures are between 65-85 degress. Roundup will not give satisfactory results if the temperatures are below 50 degrees


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Can it be to hot to spray roundup?

Yes it can be. To get the best results when using Roundup you will want the temperatures to be between 65-85 degrees. Roundup will not work with temperatures above 85 degrees because the plants start to go dormant, and when the plants go dormant, they will not absorb the chemical.


What does roundup ready mean in plant science?

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