Squirrels Killing Tomatoes

The squirrels have been decimating our tomato plants.  Most only had small green tomatoes but the squirrels just destroy the plants.  Our biggest plants are now just a pile of shredded green stems.  We fenced two remaining plants in what we thought would be squirrel proof structures.  It seemed to work for a week but then the plants started showing signs of damage.  Finally yesterday the back one in the second picture was totally destroyed.  We don't think the holes in the fencing are big enough to allow a squirrel in but there really isn't another explanation for the destruction.   No thanks to the squirrels, we'll have to find a local farmer for fresh tomatoes this year.