Jo not disputing your word On it Cause you spray a lot , But I had to look it up and see If the old man that told me what I posted was just pulling my leg or not and It seems to have some merit like I said It has worked for me. The dew Im speaking of is not a Dripping type dew.
"One of the evils of glyphosate -- at least from the standpoint of weeds -- is that it is most effective on weeds that are happy and growing quickly. The phloem is active and respiration is complete, both of which allow the herbicide to work more effectively. Weeds tend to be happy in the morning, just before the dew on their leaves has evaporated under the morning sun, and this can be a good time to spray them. There is no conclusive evidence that dew either inhibits or enhances the effect of the glyphosate in Roundup."
http://homeguides.sfgate.com/can-use-ro ... 92766.html