@Beckygardener I would not expect that excess moisture by itself would cause the pods to rot. If there are good seeds in the pods, the pods should not simply abort as they would if none of the seeds were good. If the seed pod is physically damaged in some way then it is possible that they might rot. That would presumably require bacteria or some microorganism getting into the damaged area. Excess moisture would enable the microorganisms to grow.
Although I do not know of an insect that damages daylily seed pods specifically in that manner, there might be insects that suck juices from plant tissues (like aphids) but that use firmer tissues, like scapes or seed pods. Sue
@Sooby may have a much better idea of what might cause appropriate damage that could lead to rotting.
