I haven't been on ATP as long as many of you and the only thing I recall is that the original rust ratings were entered from these sources, according to an earlier thread:
http://garden.org/barn/notes/r...
I assume anyone who is an ATP member can enter rust data. It has nothing to do with AHS registration, the AHS does not do rust ratings, this is strictly an ATP thing. There was an AHS associated rust resistance/susceptibility survey (which is quoted in the ATP link above) but due to technical difficulties it is no longer functioning although the results appear to be included in the ATP ratings. It was for people to enter their garden observations but a cultivar would not appear on its public listing until it had at least three ratings because one observation from one garden is insufficient to make a determination, especially if it is a rating of resistance as opposed to susceptibility.
