That does not look like tadpole damage, or disease either. I think you are looking at a few things....I do not know where in FL you are, but as hot as it has been throughout the entire state, it probably doesn't matter. From what I see, the new leaves are coming up fine and then deteriorating. They are hardy lilies that can suffer at tropical temps, especially in what appear to be small black containers that heat quickly in the sun. Fertilizers also dissipate more quickly in the heat, and as they look a little chlorotic....they may be hungry. A big thing is, hardy lilies are seasonal growers and unlike tropicals which are perennial, given heat and warmth grow and bloom year round, , hardy lilies evolved over the eons in northern latitudes and the genes evolved to have them survive cold winters, one evolutionary adaptation is that as the days shorten, the lily metabolism begins to shut down. Rather than throwing pads and flowers....it is storing starches in the rhizome as a natural preparation for winter. Long way of saying it, I know, ....but simply put, even in FL, hardy lilies are genetically programmed to go dormant. It is a perfect example of evolution in action.
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Craig