[NAFEX] brown tor resistance, was: Plum Curculio Resistant Cultivars

Anton Callaway marillen at earthlink.net
Sat Nov 17 13:12:25 EST 2007



-----Original Message-----
>From: Douglas Woodard <dwoodard at becon.org>
>Sent: Nov 16, 2007 1:43 AM
>To: Anton Callaway <marillen at earthlink.net>, North American Fruit Explorers <nafex at lists.ibiblio.org>
>Subject: Re: [NAFEX] brown tor resistance,	was:  Plum Curculio Resistant Cultivars
>Apparently the Brazilian brown rot resistant peach was a standard type
>of canning peach with the same rubbery flesh that the Babygold series
>has. The Babygolds, from the New Jersey Agricultural Experiment Station 
>in 1961, were bred for suitability for machanical processing and 
>originally with a view to mechanical harvest, which latter I don't think 
>worked out well.
>I was told that when a rubbery-fleshed "canning clingstone" peach is 
>crossed with a standard freestone fresh eating type, the first few 
>generations tend to have poor flesh texture for any purpose. Given 
>Vineland's chronic shortage of resources, breeding the brown rot 
>resistance into the canning peaches was by far the highest priority. I 
>have noticed that the Babygolds are quite prone to brown rot here and 
>grower losses to this cause are usually appreciable and can be quite 
>serious. I expect that being able to sharply reduce losses to brown rot 
>would make a considerable difference to the profits of growers of 
>canning peaches here.
>I doubt very much that there was any linkage between flesh texture and
>brown rot resistance in the Brazilian peach.
>As to information, I think the mention in Pomona was in the late 1980s
>or early 1990s. If the index covers those years likely you could find it
>by that means, although I am not sure that it would contain much more
>than the abstracts referenced below. I expect that articles discussing
>it would be in something like HortScience and in either
>Horticultural Abstracts or Plant Breeding Abstracts or both. The latter
>you might have to go to your state research station's library to find.
>I would be surprised if there had not been interest in the Brazilian
>peach among canning peach breeders in the U.S. southeast - if there are
>any there now. Perhaps the growing of canning peaches in the U.S. is now
>concentrated in California.
>There are some articles (papers in symposium proceedings) with abstracts
>readable on the internet:
>ISHS (International Society for Horticultural Science) Acta 
>Horticulturae 465 April 1998)
>IV International Peach Symposium
>Breeding for brown rot (Monilinia fructicola) resistance in clingstone
>peach with emphasis on the role of fruit phenolics
>Assaying brown rot susceptibility in peach cultivars and progeny
>It appears that Glohaven is somewhat resistant in after-harvest tests.
>for the index to papers see
>There is another paper mentioning this resistant Brazilian peach
>"Bolinha" which is said to be of low quality:
>ISHS Acta Horticulturae 622  August 2003
>XXVI International Horticultural Congress: Genetics and Breeding of Tree
>Fruits and Nuts
>Resistance to brown rot disease in peach is determined by multiple
>structural and biochemical components
>for the index see
>I noticed an obituary of one of the California researchers involved at
>These symposium volumes might be available by inter-library loan.
>Doug Woodard
>St. Catharines, Ontario, Canada
>Anton Callaway wrote:
>> Resistance to brown rot in peaches is very interesting.  I'd love to hear more details about this Brazilian peach and the mechanism of resistance.  For instance, is the rubbery flesh a coincidental phenotype or is it part of the resistance mechanism?  Does this resistance hold up even when curculio control is less than complete?
>> Anton
>> Zone 8
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