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'MASmabay' rose Reviews & Comments
Discussion id : 95-221
most recent 4 OCT 16 HIDE POSTS
 
Initial post 4 OCT 16 by Give me caffeine
Available from Swiss Garden nursery in Perth: http://www.swissrosegarden.com/r651/martine-guillot-roses-perth
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Discussion id : 95-220
most recent 4 OCT 16 HIDE POSTS
 
Initial post 4 OCT 16 by Give me caffeine
Available from Ladybird roses: http://ladybirdroses.com.au/martine-guillot
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Discussion id : 95-218
most recent 4 OCT 16 HIDE POSTS
 
Initial post 4 OCT 16 by Give me caffeine
The description page for this rose says it is susceptible to blackspot. There is nothing about that in the references, and the only member comment that mentions blackspot indicates that this rose has good resistance.

The member ratings (which admittedly must frequently be taken with a pinch of salt) claim excellent resistance to disease, but obviously without any indication of which disease this relates to.

There is one photo (Photo Id: 288945) which appears to show some "blackspot", but based on a recent conversation with Michael Garhart (https://www.helpmefind.com/gardening/l.php?l=21.288890&tab=32) it looks to me as though that spotting may be caused by Cercospora instead. The grey centres in the spots are a trait of Cercospora, and don't appear with Diplocarpon.

So the question here is: where did the "Susceptible to blackspot" warning come from?

Edit: Found this over on houzz (in the "Guillot Generosa Roses" thread) - "I used to live in Thailand (20 years ago) and now I live in southern Mississippi. We have very high heat and humidity here too. I have 5 plants of Martine Guillot and they are some of my healthiest roses. They do not have problems with blackspot or mildew and I rarely spray."
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Discussion id : 54-646
most recent 19 JUN 16 SHOW ALL
 
Initial post 30 MAY 11 by Simon Voorwinde
Lineage:

"Origin and Breeding Controlled pollination. Seed parent ‘New Dawn’ x pollen parent ((‘Chaucer’ x ‘Aloha’) x (‘Iceberg’ x “unnamed seedling”))"

Ref: http://pericles.ipaustralia.gov.au/pbr_db/docs/2001265.doc
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Reply #1 of 10 posted 31 MAY 11 by HMF Admin
Thank you.
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Reply #2 of 10 posted 14 OCT 11 by Robert Neil Rippetoe
I suspect but can't confirm the 'Iceberg' shown in this lineage is incorrect and should be the more common floridunda version 1958.
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Reply #3 of 10 posted 14 OCT 11 by HMF Admin
Thanks Robert.
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Reply #4 of 10 posted 14 OCT 11 by Simon Voorwinde
What was it before? I assumed the 'Iceberg' in the lineage I posted would automatically be entered as the common Kordes, 1958, version.
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Reply #5 of 10 posted 14 OCT 11 by Robert Neil Rippetoe
It was entered as Kordes 2002 florists version, which is highly unlikely since this rose was introduced in 1991.

http://www.helpmefind.com/rose/l.php?l=2.36436
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Reply #6 of 10 posted 1 JAN 15 by Michael Garhart
Its essentially just New Dawn x Graham Thomas. The way the parentage is listed is really odd. Its hard to fathom the breeder followed the same pathway as Austin did, lol. But yeah. Definitely the well-known Iceberg.
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Reply #7 of 10 posted 18 JUN 16 by Daniel Alm
The notes in the description of this rose should be updated to say that the pollen parent was most likely Graham Thomas. The parentage is "New Dawn X Graham Thomas," as proposed by Michael Garhart. ~Benaminh
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Reply #8 of 10 posted 18 JUN 16 by Michael Garhart
By the same breeder, Sonia Rykel follows the same pattern. Yet, two other roses by the same breeder simply say 'Graham Thomas'.
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Reply #9 of 10 posted 18 JUN 16 by Daniel Alm
I request that the HMF admins just add a note at the bottom of the description tab stating that Graham Thomas is the likely pollen parent versus changing the official parentage hot link. Saves us time having to look at all the progeny of Charles Austin (Chaucer X Aloha) and Iceberg to reach the same conclusion. ~B.
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Reply #10 of 10 posted 19 JUN 16 by Patricia Routley
Done. I know you will also be using the PARENTAGE TREE in LINEAGE
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