I planted elephant ear bulbs last year after amending the clay soil I have. They showed good progress so far. This year, we had plenty of rains and the soil is constantly wet but I do not see any water clogging, so I think soil is not the culprit here. However, for the last couple of weeks or more, I noticed the plants have not been doing well. They have developed brown spots all over,developing big quarter sized holes and turning yellow and brown. I do not see any slugs or snails either.

Can anyone help me with any advice for the problem? I hope to salvage my Elephant Ear plants.