There is high fireblight pressure here, residual in some natives and frequently planted ornamental pear and pyracantha.
Pear trees without high fireblight resistance are toasted. Apples rarely show more than tip burn – including cultivars hard-hit in the 2020 Geneva event.
I don’t think I know enough to know what I’m missing 
I just stumbled on it and extracted the data to a spreadsheet.
Do you have a link hand to the USDA-GRIN?
Yeah, Orange Pippin and Cummins were two that I was cross referencing, as well. At first, I thought the data from Cummins was just matching Cornell’s database, but I did find some cases where they did not. OP seems to have a slightly different take on a number of them, so I’m guessing their data is coming from somewhere else.
It’s the same database. What urls are you using to access each?
When I first moved into this house, there was a poorly managed mature pear tree that seemed to get a lot of blight. After I removed a neighboring, overtowering tree, it bore a heavy load of fruit, and it appeared to be Bartlett. However (fingers crossed), not for the last many years, whereas an Apple I butchered last summer has it all over. I suspect health of the tree is better now, and while Bartlett is reported to be pretty susceptible, it seems pretty OK for me.
This one:
https://npgsweb.ars-grin.gov/gringlobal/cropdetail?type=descriptor&id=115
I won’t pretend to know anything about navigating USDA land.
Yes, I did look for some information from CSU, and they have some published under the extension. I’ve reached out to understand if it is from local data or just compiled data from other non-local studies. CO has a decent apple presence, but nothing by comparison to where you live!
The usda is one of my go to sites for fireblight. They are doing more research all the time. Fireblight has many strains.
https://www.ars.usda.gov/research/publications/publication/?seqNo115=365637
https://www.ars.usda.gov/research/publications/publication/?seqNo115=378289
When you look through their catalog look for fireblight resistant pears like ayers
https://www.ars.usda.gov/ARSUserFiles/20721500/catalogs/pyrhybrid.html
Resistance does not mean they cant get fireblight. It means they are rated with some resistance. Many universities rate them as highly resistant, moderatly resistant, FIRE BLIGHT RESISTANT, susceptible, moderately susceptible, highly susceptible etc. This disease is getting worse not better. Here is a great place to start in this write up from 1973
GOVPUB-A-PURL-gpo28764.pdf (6.8 MB)
Take a look at this information from Dr.Bell
New-Fire-Blight-Resistant-Pear-Cultivars-MAFVC-2013.pdf (1.2 MB)
This is by Dr. Ken Johnson on the more organic control of fireblight using copper etc. https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.eorganic.info/sites/eorganic.info/files/u461/Fire%2520Blight%2520Control%2520Program%2520in%2520Organic%2520Fruit.pdf&ved=2ahUKEwiE69GLkeODAxXhC0QIHXp_BO04ChAWegQICxAB&usg=AOvVaw1gAhraPNV-GCOgydrgY0jU
Not USDA ARS GRIN.
Further they have different login systems. And though the accession/descriptor searches feel similar; the results are different with work from international groups included.
What is the URL you use as a starting point for searching USDA-GRIN?
What is the URL you use as a starting point for searching GRIN-GLOBAL?
You login by going to a foreign repository website in the system. That links into Global Grin. Kind of strange.
Here is my page signed into:
Crop Research Institute
Welcome! dannytoro1@gmail.com
GRIN-Global Logo
We apologize, but the distribution of Solanum lycopersicum L. and Capsicum spp. is suspended due to the EU regulation (details); only accessions with CZE (CSK) origin are tested and available.
GRIN-GlobalGRIN Czech
Version:
2.3.4.1
Accessions
Descriptors
Reports
GRIN Taxonomy
GRIN-Global
Help
Contact Us
Your ProfileYour request history
Click on the web request number for details.You have no web request history.
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There is a lot of extra information and cultivars to be had. For instance the Czech site catalogs 24 available Polish apple cultivars. Many more then ARS-GRIN.
In the past, i have only dealt with UC Davis, Geneva, and Corvalis Very thankful for ARS GRIN programs! A plethora of pears & apples!
I didnt realize about the global side of the USDA ever being available to the public. I did know they import and eventually those plants are available in the 3 locations i mentioned after ensuring they are disease free.
You are simply looking at GRIN installed at foreign repositories.
No sir. More cultivars. Better Description over more charecteristics. No PI or GMAL numbers. They use a modified format of GRIN.
Thanks, Clark. That is all super helpful.
Sounds like you have seen some good data around the pear fireblight information they have. I wish I could have more confidence in the GRIN Apple FB data, or understand the root cause for so much variance from other public sources of data, but it sounds like I have to just accept the uncertainty and dig for local info.
Funny thing is I ran across the 1970’s doc you linked earlier yesterday and saved it off, but now you’ve confirmed it’s a still relevant read, so I’ll have to read through.
Thanks for the other links as well… will look through them tonight.
As always, you’ve been very helpful and sharing good information, and I appreciate you!
@dannytoro1
Here are the GRIN links I use most frequently.
Taxonomy: https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomysearch
Accessions: https://npgsweb.ars-grin.gov/gringlobal/search
What link(s) do you use?
I use descriptors heavily. Seconded by Accessions Advanced Search.
I’ve yet to see a foreign department of agriculture which had a use for these fields.
