I guess I've just been lucky, Maurice! I have occasionally seen aphids on daylilies I've received from elsewhere in Ontario. I've seen them on daylilies in a garden nearby but I don't know what species of aphid they were (more than one can affect daylilies). But I've brought my own daylilies indoors for the winter several times for various reasons - no aphid population developed over time. Perhaps they just can't handle the winters here where it can get very cold with little protective snow cover (as was the case this year until fairly recently).
