Answer: Well, obviously you want something temporary because eventually you want the deer to come back. So, I think a good choice would be the product "Deer Away" sold by Burpee. It is effective in repelling deer but must be reapplied every 7-10 days (you will find this true for most all repellents, the rain and dew tend to wash them away). You can simply stop applying the repellent when the corn is ready. Burpee also sells coyote urine which is effective at repelling deer. Check out the most recentcatalog (if you need one call 1-800-888-1447 or visit the website) to obtain either of these products. I have heard of people hanging Dial soap in the trees along the perimeter of the property to deter deer, I can not attest as to whether that works though. Perhaps a combination of methods would be your best option.
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