I get hit with SVB every year, but have yet to loose a zucchini plant to them. I only grow two that are both bush varieties (vs vining), so only one very short main stem.
The minute I see SVB frass, I go digging into the stem with a pair of sharp pointed garden scissors until I find them and then chop them up. It's amazing how healthy and productive the plants are even after I've hacked the heck out of the stem to the point where it's barely half attached!
This year I have eight plants and only two have been attacked and both are still producing.
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