Wrap the trunk with an electric fence spaced a couple of inches from the tree http://www.tractorsupply.com/tsc/product/economy-wood-post-insulator-black-pack-of-25?cm_vc=IOPDP1
Then at the top of the wire have something like this waiting for him with the center cut out http://www.amazon.com/Behrens-Replacement-31-Gallon-Steel-Trash/dp/B000RUAUIK/ref=sr_1_31?ie=UTF8&qid=1463881219&sr=8-31&keywords=garbage+can+lids
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