Answer: The borers are active for about a month in June with usually only one generation per year. Planting after that period should solve the problem. Zucchini grow fast enough that you should still have a nice crop. Another approach would be to plant at the normal time but wrap nylon stocking material around the stems to stop the borers; this is fairly labor intensive however. Finally, if you notice a borer hole in a stem early enough, you can kill the borer with a sharp wire or knife tip and the plant may recover.
Q&A Library Searching Tips