View Full Version : How warm does it have to be for roundup to be effective?
01-18-2005, 09:12 AM
Just wondering at what temp you guys stop spraying.
01-18-2005, 09:54 AM
anything below 40 degrees F, but up here have never sprayed later than Sept. 1
Whatever you are spraying it on has to be growing and not dormant.
01-18-2005, 01:17 PM
There is no real temperature limit for Roundup application. The only qualification is that a plant be actively growing if you want to control it with Roundup. You can actually use Roundup as a selective over the top control at lower temps - i.e., desireable plants are dormant, but weed plants are still growing.
01-21-2005, 04:45 AM
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