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View Full Version : How warm does it have to be for roundup to be effective?


Cutworm
01-18-2005, 10:12 AM
Just wondering at what temp you guys stop spraying.

westwind
01-18-2005, 10:54 AM
anything below 40 degrees F, but up here have never sprayed later than Sept. 1

PTP
01-18-2005, 10:58 AM
Whatever you are spraying it on has to be growing and not dormant.

GroundKprs
01-18-2005, 02:17 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.

Cutworm
01-21-2005, 05:45 AM
Thanks All!