My cucumbers were doing great and then one day last week, the leaves started spotting and the vines started getting mushy and slimy. I saw snails at the root so I bought snail/slug killer and Sevin dust (that's the white powder you see on the leaves). I applied both products 2 days ago and so far my cucumbers have not improved. Is this damage from the snails or something else? This is my first time growing cucumbers so any help would be greatly appreciated. Thank you!