I just set out two more squash plants yesterday (one crookneck, one zuke) and put a row cover tunnel over them not only to deter borers but also to give a bit of shade in this hot sun.
They'll eventually will outgrow the row cover but by then hopefully there won't be any more borers out and about. Yeah, there's a small gap between the bottom edge of the cover and the ground but it will have to do. I can't lower the hoops anymore and the width of the cloth is what it is.