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Post by templeton on May 7, 2012 2:37:31 GMT -5
I did a quick search looking for some powdery resist varieties - after suffering several years with devistating PM I thought I would take a leaf out of Joseph's book and try and breed up some resistant lines and came up with this site <http://vegetablemdonline.ppath.cornell.edu/Tables/TomatoTable.html>
and these varieties Geronimo F1 Granadero F1 Massada F1 and Striped Stuffer.
I looked for suppliers, and found some of them at outrageous prices in the US - $31 for 50 seeds at johnny's for geronimo and massada, less for granadero. Of course, they aren't available here, but I was wondering is this normal for F1 seed? Seems like a lot of money for seed. T
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Post by Drahkk on May 7, 2012 4:44:09 GMT -5
Depends on the hybrid. If it's new, in high demand, or the vendor has exclusive rights to it, and it has some claim like that resistance that makes it valuable, then yes, they try to milk it for all it's worth. Last year I paid $7 for ten seeds of Black Hawk F1 zucchini from Territorial because it claims to be trailing and suitable for growth on a trellis. And that turned out to be a bald faced lie. It was a bush type just like all the rest.
I remember reading somewhere that you could control PM with either diluted milk or a baking soda spray. Did you happen to try either of those?
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Post by templeton on May 7, 2012 5:17:59 GMT -5
Yeah, tried potassium bi carb, with oil, seems to stop it for a lttle while, but it kicks back in a week or two. Resistance would preferable. it hits the potatoes as well. the Pot Bi carb works well on powdery on peas, but I think that's a different organism. T
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Post by Drahkk on May 7, 2012 9:34:02 GMT -5
A naturally resistant strain thus far only known as LC-95 seems to have been discovered in Ecuador. That would seem the best starting point to develop our own strains. Not sure how to go about getting our hands on some, though...
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Post by Drahkk on May 11, 2012 2:04:59 GMT -5
Still haven't found LC-95 itself, but Singer offers the accession it was derived from (LA-1230). That being the case, the seeds would probably carry the ol-2 gene for PM resistance, but would likely not be homozygous for it. And it is recessively inherited, so it could take a while to first get a homozygous (and therefore resistant) plant to start from, then breed the gene into your own line. Not sure if you want to go to that much trouble on a "probably", but here's the link: singer.cgiar.org/index.jsp?page=showaccession&acc=226vi005544&coc=co6Might be easier to bite the bullet and give the hybridizers their pound of flesh, to know for sure you're getting the resistant gene into your population. When they become available there, that is. Unless someone here has a sample they can share? One note: the hybrids MAY be considered GMOs. Some of the research articles I read through are a bit over my head, but it sounded like they were trying to either clone a dominant form of the gene, or delete the section that codes for the protein ol-2 deactivates in order to duplicate the results that way. Here's one of the longer ones, for those whose cognitive facilities exceed my own: mpiz-koeln.mpg.de/downloads/Publikationen_2008/bai_mpmi_2008.pdf MB
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Post by DarJones on May 11, 2012 2:40:50 GMT -5
Or you could just get the variety Tropic and use it as a parent in your cross.
DarJones
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Post by Drahkk on May 11, 2012 5:38:10 GMT -5
*looking embarrassed* Nice find! ;D MB
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Post by raymondo on May 11, 2012 6:15:14 GMT -5
Hey T, Eden carries Tropic!
Edit: So do a number of other Australian suppliers.
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Post by templeton on May 11, 2012 7:14:45 GMT -5
Thanks Dar, ray. I'll order some. T
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