Whats eating gimbert grape

I have 2 plants in the same pot and one seems to be rotting from the bottom up.

I get an occasional leaf like these on other plants but this one is being eaten alive.

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If you have 2 plants in the same pot there competing for nutrients. There’s not much you can do now.

Looks like a manganese deficiency

The plants are both identical and in the same planter box so why is one so bad?

Good question, one could be dominating the other for food. im also wondering are there any pests that you can find anywhere. An infestation could be starting there and about to spread to the other plant when their numbers overcome just the first plant.

Unless they are clones they are not the same