I was cutting off some of the yellowing leaves on the zucchini plants. After I finished I went to pick up all the leaves and saw the most disgusting white grub. It took me a while, about half the day, to realize this was not a good thing. I googled vine borer and saw a picture of an insect that I had seen a couple of times on the balcony. Before work, I checked the zucchini in the smaller container. Bad sign #1.