I get plenty of spring sickness but have not had aphids on the daylilies
I am very surprised that you have not had aphids on your daylilies. Although I do not see them on the daylilies growing in the field, more or less every daylily that I have potted and brought inside during the autumn and winter has been infested with aphids. They are not obvious (visible) when I first bring them inside but their populations explode after the daylilies have grown inside for a while. I suspect that they are common on the plants in the field but are kept at low numbers by natural controls that are not present indoors.
Curiously, bulb mites are thought to be ubiquitous on daylilies but I have not found them on any daylilies I have examined, while aphids would seem to be ubiquitous here.