Liquid fence. There also a motion detector sprinkler. I've used the LF and it works and stinks but you have to repeat after a rain.
Worked for me. Let it sit for a day or two.Get several milk jugs, use those to urinate in for the next few days. Poor urine around not on the trees. Follow this process several times and i bet they will not return. Had the same problem here in NH and the smell of human urine keeps them far away.
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