> I was told and it works for me that is you do a dormant spray in an above > freezing day in Feb or there abouts, you will kill 90 percent of your > troubling borers. It kills the eggs that are dormant on the plants. This has > the least affect on the birds or bees. Jackie A dormant oil spray works by enveloping something (an insect in this case) inside a suffocating film. There is no way this can kill eggs, as in order to kill something---that something has to be breathing. That is, if you are indeed referring to a dormant oil spray. Pat