Author Topic: Breeding for Late Blight Resistant Tomatoes  (Read 600 times)

Diane Whitehead

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Breeding for Late Blight Resistant Tomatoes
« on: 2019-02-28, 07:12:37 PM »
We have had a long discussion on late blight, potatoes and tomatoes.

Instead of adding to it, I'd like to start this new one on a project to start breeding this year.

I have some resistant varieties, and have bought more, from England and the U.S.

 These are the seeds I have already grown. I don't know which resistance they have.

Geranium Kiss
Legend
Bolivianische Obsttomate
Chernomor, Reg Lf
IPK LYC 859 El Salvador
Little Julia
Matt's Wild Cherry
Sky Reacher
Skykomish

These are the new ones I just bought.

Make My Day - by Tom Wagner
Cocktail Crush a new release by Burpee Europe presumably F1, but it doesn't say
Crimson Crush F1
Oh Happy Day
Losetto Cherry F1  bred from the Bangor University research

The packets promise just 10 seeds each, but if someone has a project that they would be useful for, I can spare a few.

I hope Carol can suggest the best way to proceed.

Dehybridize the new European ones?  Start crossing?


Victoria, British Columbia, Canada
cool mediterranean climate  warm dry summers, mild wet winters,  70 cm rain,   sandy soil

Joseph Lofthouse

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #1 on: 2019-02-28, 09:05:11 PM »

reed

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #2 on: 2019-03-01, 03:43:34 AM »
I got some Iron Lady and a hybrid called Celebrity to add in to my mix. Celebrity doesn't have blight resistance but resistance to about all other tomato diseases and since blight is just one of many problems in my neighborhood I need the others too.  I'm just gonna try to cross them up several others of my own and see what settles out. I'm using Mr. Stripey, one of my favorite old tomatoes that apparently already has some resistance to try to come up with something that tastes the way we like but keep producing till frost like in the old days.  Diseases are bad enough here that I don't have to do much except wait till healthier longer lived plants show up.

PaulJ

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #3 on: 2019-03-07, 10:48:16 AM »
Would be more than happy to pitch in some seeds if anybody wants them
have some from last years tomato blight selections from unknown parents:

"Year 1 sweet slicer"
"Year 1 Cherry tom"
"year 1 Everything else" (have quite a bit of this)

also think I have some saved/leftover seed from:

"Glacier" did well, last pickings November, large cherry type, very productive, OK taste
"Moskvich" seems to do OK outside, tasty, average production

Would want to only send to one of you, as Im in UK
« Last Edit: 2019-03-07, 11:04:01 AM by PaulJ »

ImGrimmer

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #4 on: 2019-03-10, 12:47:43 PM »

Legend
Skykomish

didn`t show resistency here in northern Germany.

Mountain Magic has very good resistency.

I have my own tomato strain which shows often resistency but fails in some years between. But it has always better resistency than other varieties.

nathanp

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #5 on: 2019-03-10, 02:56:18 PM »
This is in the other post as well

I found the list:
Homozygous for Ph2 and Ph3
Iron Lady
Lizzano
Skykomish (from Tom Wagner)
Crimson Crush

Heterozygous for Ph2 and Ph3
Mountain Magic
Mountain Merit
Defiant
Jasper (probably has both - not confirmed, unsure if heterozygous or homozygous)

Homozygous for Ph3
Plum Regal

Homozygous for Ph2
Legend (OP)

Possibles/Probables
Matt's Wild Cherry - probably Ph3
JTO-545 - probably Ph2
Sun Gold   Some resistance anecdotally, but I am not sure what it is from.

These are the ones I have grown. I am currently working on growing out several of the F1 hybrids to stabilize the lines. Skykomish is F8/F9 so that is stable already, though a little too long season for my climate.

Homozygous for Ph2 and Ph3
Iron Lady
Skykomish (from Tom Wagner)

Heterozygous for Ph2 and Ph3
Defiant
Jasper (probably has both - not confirmed, unsure if heterozygous or homozygous)

Homozygous for Ph3
Plum Regal

This webpage has a more complete list
https://articles.extension.org/pages/72678/late-blight-management-in-tomato-with-resistant-varieties
« Last Edit: 2019-03-10, 03:00:27 PM by nathanp »

William S.

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #6 on: 2019-03-10, 05:33:20 PM »
Something that really strikes me about that list Nathan is that you have four varieties in the Homozygous Ph2 and Ph3 list. It seems you me that crossing up those varieties should be done and since many of them are F1s should lead to many new varieties.

My other thought is to develop a lot of F2 crosses with my favorite tomato germplasm. Then when the blight hits should have some resistant material with those traits. Course wouldn't wait for that but rather send some F2 seed out to collaborators.
Western Montana garden, glacial lake Missoula sediment lacustrian clay mollisoil sometimes with added sand in places. Zone 6A

William S.

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #7 on: 2019-08-25, 11:04:36 AM »
The one plant of Lizzano F2 I grew out is interesting. Would be good for winter breeding. Seems like it belongs in the very short season very small fruit and plant category. Saved some seeds.

Have an Iron Lady F1 in the seed saving pile. No sign of a ripe Skykomish yet. No crosses made.
Western Montana garden, glacial lake Missoula sediment lacustrian clay mollisoil sometimes with added sand in places. Zone 6A

ImGrimmer

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #8 on: 2019-08-25, 02:21:51 PM »
I grew many F2 and F3 Mountain Magic plants. So far no late blight infection. LB season just started. Today I found 2 infected plants in other strains.

William S.

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Re: Breeding for Late Blight Resistant Tomatoes
« Reply #9 on: 2019-09-02, 09:42:51 PM »
My one ripe Iron Lady didn't have many seeds. Then half sprouted while fermenting. So I have four Iron Lady F2 seeds drying. I may call that good. Picked some more and just put them in with the general bag to eat or give away. Still no Skykomish. Have to say, pretty excited about Lizzano comparatively for shortness of season.
Western Montana garden, glacial lake Missoula sediment lacustrian clay mollisoil sometimes with added sand in places. Zone 6A