I'm so sorry. We have that problem here. We were discussing at our DL sale Sat. and the general thought was that an electric fence is the only "sure" defense. "De fence" is the answer. LOL
Short of that I've used milorganite put out about every 3 weeks. Plantskydd also works some but must be reapplied after a heavy rain.
In the past I alternated those two every four weeks. This year the deer have been more avaricious so we're planning on putting a fence around the breeding beds.