David from Dryden writes
i sprayed QuikPRO on a stone patio to kill grass and weeds between the stones, it worked well. 10 days later we got 1.5 inches of rain. Then, two days later the grass adjacent to the patio died as if something had washed off the patio and onto the grassy area. The grass was previously healthy and strong. Could QuikPRO wash into the grass area 10 days after application?
Glyphosate, the active ingredient in Roundup QuickPRO, does not remain active for long after an area is treated. Per the manufacturer, if an excessive amount of Roundup QuikPRO was sprayed into the stone patio, there may have been enough of the Roundup remaining on the stone to wash off onto the adjacent grass area.
Answer last updated on: 08/17/2018
