Hello Gary and all Gary you are right the first paper on breakdown of Vf gene is 1993. Just this morning on my desk the IOBC wprs (international organisation for biological control of diseases and pests) Bulletin on integrated protection of Fruit Crops. There are interesting papers (english) among those one from Parisi and alt which title is : Geographical distribution of Venturia strains virulent to the Vf gene in Europe. Pp 49-52. If I try to summarize : 7 strains have been discovered in Venturia depending on their ability to overcome genes that are present in different apple varieties : If we consider races 1, 6 and 7 Gala is susceptible to all; Golden D is S to race 1,2 and resistant to race 7; Prima is S 6 and R 1,7 Malus floribunda (Vf source) is R 1,6 and S 7
And the landscape is that Vf gene is broken by race 7. This race is mainly present in northern part of Europe. In our conditions in south west of France where we grow lots of Vf monogenic resistant apple varieties, we do not saw any break-through. In order to strengthen the durability we decided to spray once a year the resistant varieties on the main ascospore releasing peak. Its still working on this base but future is not clear. All the main teams who are hybridising apple are now involved in a European project named DARE for durable apple resistance. Regards Jean Marc Jourdain Ctifl jourdain(&at&)ctifl.fr www.ctifl.fr www.fruits-et-legumes.net -----Message d'origine----- De : Gary Mount [mailto:[EMAIL PROTECTED] Envoyé : mercredi 28 mars 2007 15:55 À : Apple-Crop Objet : Re: Apple-Crop: Time article (More on same) There have been several postings about Vf resistant scab being a possibility since most resistant varieties share this gene. However, these varieties have been around for quite a while now--is there any information about resistance showing up anywhere? Is there something different about Vf resistance that would save it from what happened to Baldwin or Bramley? Gary Mount, Grower Princeton, NJ ----- Original Message ----- From: "Bill Shoemaker" <[EMAIL PROTECTED]> To: "Apple-Crop" <[email protected]> Sent: Wednesday, March 28, 2007 7:05 AM Subject: Re: Apple-Crop: Time article (More on same) > Steve > > I've been growing Liberty and Pristine for about 10 years on B9 for > evaluation in northern Illinois. It's taken awhile to appreciate them. But > last year we had a very nice crop of Pristine. For the first time, I really > enjoyed them. Flavor was great, flesh color and texture were very good for > such an early apple (second week of August). I gave quite a few away and > people were very fond of them. But Liberty has not developed the culinary > quality I would want in a fresh apple. What are the characteristics of > Liberty that you find compelling? > > Bill Shoemaker, Sr Research Specialist, Food Crops > University of Illinois - St Charles Horticulture Research Center > www.nres.uiuc.edu/faculty/directory/shoemaker_wh.html > > > > The apples I rely most on are all products of breeding > >>programs, and the two I would most loath giving up are PRI varieties: > >>Liberty and Pristine. > > > Steve Demuth > > Decorah, Iowa > > > > -------------------------------------------------------------------------- - > > > The 'Apple-Crop' LISTSERV is sponsored by the Virtual Orchard > <http://www.virtualorchard.net> and managed by Win Cowgill and Jon > Clements <[EMAIL PROTECTED]>. > > Apple-Crop is not moderated. Therefore, the statements do not represent > "official" opinions and the Virtual Orchard takes no responsibility for > the content. > > > > > > > --------------------------------------------------------------------------- The 'Apple-Crop' LISTSERV is sponsored by the Virtual Orchard <http://www.virtualorchard.net> and managed by Win Cowgill and Jon Clements <[EMAIL PROTECTED]>. Apple-Crop is not moderated. Therefore, the statements do not represent "official" opinions and the Virtual Orchard takes no responsibility for the content. --------------------------------------------------------------------------- The 'Apple-Crop' LISTSERV is sponsored by the Virtual Orchard <http://www.virtualorchard.net> and managed by Win Cowgill and Jon Clements <[EMAIL PROTECTED]>. Apple-Crop is not moderated. Therefore, the statements do not represent "official" opinions and the Virtual Orchard takes no responsibility for the content.
