The squash vine borer is the larva of a clear wing moth that some thinh looks more like a wasp than a moth. The key to control of the borer is to keep the adult from laying eggs on your plants and that involves using Floating Row Covers. Once the larva hatch from the eggs and enter the plant stems there is very little any insecticide can do since spraying the outside of the plant will not reach the borer.

The most effective control for the borer, once it is in the plant stem, is to slit the stem and remove that larva. Some people have injected the Bacillus thuringiensis - Kurstaki spores into the stems ahead of the borers and have reported success doing that. The larva travers the stems, not the plants roots.

Perhaps this article will be of some help.

https://entomology.ca.uky.edu/ef314

If it wasn’t sufficiently apparent, the original post provides a link to a post (In an equally appropriate category) with three very specific questionsregarding Squash Vine Borers.
Please view them here: “Squash Vine Borer Questions” and--If you know the answers-- reply in whichever category you prefer.

Thank You