Scott from Grand Rapids, Mi writes
We have not heard of any issues of Avenger Weed Killer Concentrate harming structures, however it can break down seals in some sprayers over time. It should not melt the plastic of the hoophouse, but it could possibly discolor it or weaken it if sprayed directly. It would be best to protect the sheeting with a barrier like cardboard or a tarp, or to test a small area. We also recommend avoiding spraying during the day when it is very hot.
Answer last updated on: 07/05/2018