Xyleta infecton in Europe from World Rose News December 2018

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henry kuska
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Xyleta infecton in Europe from World Rose News December 2018

Post: # 68928Post henry kuska
Wed Jan 09, 2019 3:57 pm

See:

https://www.gardenweb.com/discussions/5 ... r-2018#n=0

Also, there are other articles in this issue that I think will be of interest to hybridizers.

guillaume beaugey

Re: Xyleta infecton in Europe from World Rose News December 2018

Post: # 68940Post guillaume beaugey
Fri Jan 11, 2019 8:42 am

Please find a correction of Mr. Alain Meilland about last World Rose News, his comments have been misunderstood:

During an analysis in 2015 in Corsica, 1 plant of “Rosa x floribunda” was found positive to the bacteria Xylella fastidiosa. After a second check, it appeared that the plant analyzed was not from the genius Rosa, it was a mistake. Rosa x floribunda has been removed from the list of the EUROPEAN COMMISSION DATABASE OF HOST PLANTS FOUND TO BE SUSCEPTIBLE TO XYLELLA FASTIDIOSA. From what we know, up to now, no sample of the genius Rosa has been found positive to Xylella fastidiosa in France or in Europe. Any plant of roses can be moved within European Union if they have an European Phytosanitary Passport, and outside European Union depending on specific Phytosanitary legislations of each country.

henry kuska
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Re: Xyleta infecton in Europe from World Rose News December 2018

Post: # 68941Post henry kuska
Fri Jan 11, 2019 10:35 am

Can you give us a reference for your statement?

My interpretation of the link link below is that it has been found in 9 rose plants. (Please note that later in this thread it has been pointed out that this interpretation is incorrect.)

Title: "Plant Hosts of Xylella fastidiosa In and Near Southern California Vineyards"

https://apsjournals.apsnet.org/doi/pdf/ ... 88.11.1255

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Also, please see:

Title: "Can Rose Plants Host Xylella fastidiosa?"

http://cssf.usc.edu/History/2007/Projects/J1407.pdf

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This is what a Google search found:

https://www.google.com/search?num=100&n ... 35&bih=516

There is a reference to an infected Laurier rose (which is not a rose). Is this the cause for the confusion?

https://www.youtube.com/watch?v=9hYO7oE0qTo

https://fr.wikipedia.org/wiki/Laurier-rose
Last edited by henry kuska on Fri Jan 11, 2019 12:26 pm, edited 1 time in total.

guillaume beaugey

Re: Xyleta infecton in Europe from World Rose News December 2018

Post: # 68942Post guillaume beaugey
Fri Jan 11, 2019 11:24 am

Dear Henry,

It is mainly based on private discussion with research people in France and on European Union website https://ec.europa.eu/food/plant/plant_h ... tidiosa_en .

On your article "Plant Hosts of Xylella fastidiosa In and Near Southern California Vineyards", are listed "Plant species sampled from the field that
did NOT test positive by any method were" "Rosa spp., n = 9". Every rose plant tested near infected wineyards were NOT INFECTED. Also, around 50 rose plants were tested in Corsica in infected area, and all were negative.

The experiment "http://cssf.usc.edu/History/2007/Projects/J1407.pdf" has to be done again to validate. The main question is: is there a vector (insect) of the bacteria to transmit it to roses? Also, there are many sub species of the bacteria, each one attaching a few plant species. For exemple, in Corsica, the subspecies attacks mainly polygala myrtifolia but do not attacks wineyards or olive trees.

Yes Laurier rose in french is Nerium oleander and unfortunately is sensitive.

Guillaume

henry kuska
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Joined: Thu Dec 15, 2011 9:06 pm
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Re: Xyleta infecton in Europe from World Rose News December 2018

Post: # 68944Post henry kuska
Fri Jan 11, 2019 1:09 pm

The following was stated:

" From what we know, up to now, no sample of the genius Rosa has been found positive to Xylella fastidiosa in France or in Europe."


H.Kuska comment:

Rosa canina L. is listed in the last three updates of:

Title: "COMMISSION DATABASE OF HOST PLANTS FOUND TO BE SUSCEPTIBLE TO
XYLELLA FASTIDIOSA IN THE UNION TERRITORY – UPDATE 9, 10, and 11" They were updated on July 28, 2017, Feb 15, 2018, and Sept 19, 2018 respectively

https://ec.europa.eu/food/sites/food/fi ... date11.pdf

In the Dec 21, 2015 update (labeled update 1) Rose floribunda Steven (syn Rosa multiflora Thumb) was listed.

In updates 2 through 8 rosa X floribunda was listed. These updates were Feb 3, 2016; April 18, 2016; May 30, 2016: June 27, 2016; July 15, 2016; Nov 11, 2016; and Jan 11, 2017 respectively.

Is it possible that the original assignment of a floribunda was changed to rosa canina L. between updates 8 and 9? Or is it just a coincidence that one rose was removed and another separate rose was found in the same time interval?

https://ec.europa.eu/food/plant/plant_h ... eptible_en

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