Small holes all over tomato plant leaves

My tomato plants, which are 2 to 3 feet high and are beginning to blossom, are developing small holes all over the leaves. I also found one leaf with small rusty brown spots on its top, but don't think the holes are developing from these brown spots.

I can't see any bugs on the plants. I don't know if its related but I also get larger holes on my hosta plants which eventually eat away the entire plant.

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