I have lost 2 to crown rot and they're both tet conversions. I'm wondering if it's a coincidence or if conversions are prone to it.

I'm interested in this question, too. Though the two I have lost to crown/root rot this last year are one dip and one tet, the tet seemed to perish much more abruptly and dramatically. Though both plants had been doing well, once they started failing the dip held on a bit and seemed to improve at least a bit before succumbing. Maybe those double genes are part of the equation ... if/when rot sets in the tets may have a more marked or rapid demise?

They are a lot more prone to it than other daylilies from what the persons who have treated some for me have said. I had one that got rot after doing great for two years, when I divided it all six fans died from rot. It was a 2005 daylily and the dip has never gave me any problem. I have other ones that are treated with no problems after deviding.

Thanks for replies. Anytime there's a problem here I assume I must have created it.