Daylilies forum: Rust Susceptability Reviews

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Name: Chris Massengill
Upper East Tennessee, Bluff Ci (Zone 6b)
Clmasse
Mar 7, 2020 11:06 PM CST
Who has reviewed and updated rust susceptibility scores in the database?
Did you write a comment of the rust susceptibility in the cultivars page?
How many years was the cultivar reviewed in your garden?
Do you keep the cultivars or eliminate them from the garden?
Name: pam
gainesville fl (Zone 8b)
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gardenglory
Mar 8, 2020 8:22 AM CST
If I got rid of plants with rust I would have nothing. Doesnt hurt the flower.
Name: Nancy
Bowling Green Kentucky (Zone 6b)
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alilyfan
Mar 8, 2020 8:45 AM CST
Just curious, Chris, do you get rust where you are? I am 6b too, it does not seem to overwinter here, and I am not sure I would recognize it. Before I was really aware of it I traded with lots of people from more southerly states, and pretty sure I received some with rust, some that looked pretty sick. I don't seem to have any now so I assume it does not overwinter here. I do think zones don't tell the whole story.
Name: Larry
Enterprise, Al. 36330 (Zone 8b)
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Seedfork
Mar 8, 2020 8:47 AM CST
Chris,
What exactly do you mean by rust susceptibility scores? The way I thought the plants used to be listed for "rust susceptibility" was by individuals reporting how the plant performed in their gardens. It was either "Shows Resistance" or "Shows Susceptibility". I think that the value fluctuated as different people reported how it performed in their particular garden location.I don't think that is actually the case anymore just looking at "Shows Susceptibility" compared to decimal scores. I was told once the plant showed rust that meant it was susceptible. It appears to me that anything now showing to be "rust resistant" is anything with a decimal rating of 2.5 or below and any thing above that is rated as "Shows Susceptibility". I did not check every single plant but I did check enough that it seemed to be the case, I found no exceptions to that out of about 50 or so I checked. But if your are referring to the rust decimal scores then those are done by University Studies in most cases if not all from what I understand, so there are no reviews or updating done by members here, and they are not based on anything in members gardens but are the results of the plants studied over a limited period of time (usually short period) in university studies.
I actually pulled up the results for all the decimal scores from 1.0, 1.1, 1.2 etc. up through 2.5. The results showed some ratings with as few as 2 entries, some with well under 10 entries. The most were 216 plants with a 1.0 rating, 64 with a 1.3 rating, 49 with a 1.7 rating and 75 with a 2.0 rating and 25 with a 2.3 rating. Once I hit the 2.5 rating it seemed to me all of the "Susceptible" ratings changed to "Shows Susceptibility" from the 2.4 ratings and below which all seemed to be "Shows Resistance".
So my answer based on what I see is that there is no review or reporting of rust scores by members anymore, but maybe someone is aware of something I don't see looking at the data I saw.
Name: Chris Massengill
Upper East Tennessee, Bluff Ci (Zone 6b)
Clmasse
Mar 8, 2020 9:57 PM CST
alilyfan said:Just curious, Chris, do you get rust where you are? I am 6b too, it does not seem to overwinter here, and I am not sure I would recognize it. Before I was really aware of it I traded with lots of people from more southerly states, and pretty sure I received some with rust, some that looked pretty sick. I don't seem to have any now so I assume it does not overwinter here. I do think zones don't tell the whole story.


I have gotten rust from importing from Florida, Gulf Coast, and northern greenhouses. Ive only over wintered rust once when I used straw bales as an insulator against the house with evergreens. Rust will not survive without protection in upper east Tennessee.
Name: Chris Massengill
Upper East Tennessee, Bluff Ci (Zone 6b)
Clmasse
Mar 8, 2020 10:10 PM CST
Seedfork said:Chris,
What exactly do you mean by rust susceptibility scores? The way I thought the plants used to be listed for "rust susceptibility" was by individuals reporting how the plant performed in their gardens. It was either "Shows Resistance" or "Shows Susceptibility". I think that the value fluctuated as different people reported how it performed in their particular garden location.I don't think that is actually the case anymore just looking at "Shows Susceptibility" compared to decimal scores. I was told once the plant showed rust that meant it was susceptible. It appears to me that anything now showing to be "rust resistant" is anything with a decimal rating of 2.5 or below and any thing above that is rated as "Shows Susceptibility". I did not check every single plant but I did check enough that it seemed to be the case, I found no exceptions to that out of about 50 or so I checked. But if your are referring to the rust decimal scores then those are done by University Studies in most cases if not all from what I understand, so there are no reviews or updating done by members here, and they are not based on anything in members gardens but are the results of the plants studied over a limited period of time (usually short period) in university studies.
I actually pulled up the results for all the decimal scores from 1.0, 1.1, 1.2 etc. up through 2.5. The results showed some ratings with as few as 2 entries, some with well under 10 entries. The most were 216 plants with a 1.0 rating, 64 with a 1.3 rating, 49 with a 1.7 rating and 75 with a 2.0 rating and 25 with a 2.3 rating. Once I hit the 2.5 rating it seemed to me all of the "Susceptible" ratings changed to "Shows Susceptibility" from the 2.4 ratings and below which all seemed to be "Shows Resistance".
So my answer based on what I see is that there is no review or reporting of rust scores by members anymore, but maybe someone is aware of something I don't see looking at the data I saw.



Yes, it would be great to see people reviewing cultivars for susceptibility. I see it would be by opinion per person maybe some bias also. Valuable information can be shared this way for breeding or garden value. I don't believe that reviewing a cultivar would offend a hybridizer. Maybe I can keep updating some cultivars that I have so that there is information for the cultivars. After all I'm importing from Florida again this year.

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