I would try lots of watering. Don't fertilize them! The bushes are stressed enough without trying to push out new growth. Even if they look dreadful, remember that willows are tough. Did you check the Ortho site to see if they had any advice?

Not yet. Thanks Lisanti; the reason I thought about "fertilizer" is that I wasn't sure whether there was some king of "vitamin" or "med" that would help strengthen it until all of the poison is out.

i am surprised there is space between your pavers.. for seed of weeds to sprout ...

nor do i understand.. how you applied so much product.. it RAN off the pavers ...

ken