After two and a half weeks, I think I can give at least a tentative report on the outcome of my zucchini surgery. For the first few days, it looked like both plants were likely to survive and might even continue to produce. Encouraged by their outwardly healthy appearance, I decided that they might do better if I trimmed away some of the dead and damaged foliage to make more room for the healthy leaves. As I worked, I discovered more of the orange "fress"—that icky sawdust-like material—at the bases of the leaves. So I went digging in a little further with my knife and discovered yet more of the borer grubs working their way up the stems. In my efforts to extricate and kill them, I ended up breaking the main stem of the smaller plant and breaking off a large section of the larger one.
garden paths.) So I'm now cautiously optimistic that I may have managed to root out the borers and that this plant, though somewhat diminished in size, may actually remain productive well into August—long enough, at least, to see us through until our tomato crop starts coming in. And meanwhile, I figure I can use the nine square feet left behind by the removal of the other zucchini plant to put in some cabbages for fall.