You can probably start more seed still. I don't think the squash bugs feed on the roots, but they do like to hide on the ground, under things, and I notice my squash stems do seem to sort of whittle out a circle of dirt where they come out of the ground, presumably from the wind moving the upper part of the plant. Perhaps you just found two opportunistic hiding bugs?

I'm not too sure what you hope to do with all the soapy water and yeast, especially with the plant you pulled up. I would take a closer look at that plant now to maybe see if there might be other problems besides the two underground squash bugs. I'm not convinced that they are responsible for the strange growth you saw. I'm not saying for sure they aren't, it's just unusual enough to bear a closer look. Cheers!

Thaks Sunnibel, you may certainly be right that they were just hiding. The soapy water is real good at helping to kill many insects (and spiders on my windows). The yeast in water gets to smelling pretty attractive to insects and they go in there and drown. I have one sunk in the ground near my summer squash and I have seen far more dead squash bugs floating in that water than I have seen on my squash plants this year.

Funny thing this morning, I was checking the summer squash and zucchini for SB eggs and I found a clutch of three eggs. They were definately eggs, but only 3. Maybe they see me coming and hit the dirt.

I did check the dying plant after I sqashed those two bugs and could not see anything that could have killed the plant. I was afraid it might have been a virus or toxin that the bugs had injected in the plant. I put the vine, roots and dirt and all, in soapy water just in case they had laid eggs underground that I could not see. Sure don't want to have these guys multiplying in the garden.