It has been very disease resistant, surprisingly, given that is a Golden Showers kid, and that one turned black from blackspot and finally died when I grew it in Pennsylvania. Golden Threshold has been very resistant and it has two blackspot prone roses growing intertwined among its canes, Eden and The Alchymist, both of which got a good amount of blackspot this year but seem to have been unable to pass on a heavy infection to Golden Threshold, though it showed a few speckles here and there, but nothing of real note. If something is prone to blackspot, it wil be apparent very soon in my garden, as I do no spraying and just let disease pick the best roses out of all the ones I try. About one in four or five turn out to be superior roses for organic growing, even with all the hours of research I do before plunking money down on a new rose to try.