No idea Martha ??? It is so very sad to see the fruit of your hard labour disappear in seconds.
In my case, it's broad beans - They are doing wonderfully and have now grown flowers which, I presume will reap the beans themselves.
Yesterday, I spotted some horrid slimy stains all over my rudbeckias and something had devoured lots of their leaves. Against my principles, I sprinkled some slug pellets and guess what, there were 8 of the b**ggers dead or dying in the planter. Tonight, I looked at the beans and the telltale signs were there. I rummages around the pot and have founr 2 enormous ones which I plucked out and sent to the bin!
More slug pellets around the pot but of course I cannot put any IN the pot. I hate the things !!! >:(