My fall yellow straightnecks and cukes are doing well and producing after one squash acquired an SVB. The squash were transplanted out 7/24 and that borer hole was first noticed and injected with bT on 8/15. I had hoped it was too late in the season for borers but I guess that here in Georgia there is no end to them until frost.
After injecting the squash vine (it worked) I remembered Bill's Sevin treatment on the stem and started that on both squash plants and the two cukes as well. No more problem so far.