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Author Topic: a virused 'Katharine Hodgkin' ?  (Read 5601 times)

biodiversite

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a virused 'Katharine Hodgkin' ?
« on: February 26, 2008, 06:47:09 PM »
comparing our photos of 'Katharine Hodgkin' on my french forum, we saw different variations of colors, i. e. it seems that in acid soil colors are stronger : do you make the same conclusion ? Moreover, one of our membre has a form with some broken colors (at the bottom of this page : http://plantes-passion.forumactif.fr/les-bulbes-f7/iris-reticules-2008-t1386-15.htm sorry the photo is too big for this forum !) : do you think this plant could be virosed ?
« Last Edit: February 26, 2008, 10:55:23 PM by Maggi Young »

David Shaw

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Re: a virosed 'Katharine Hodgkin' ?
« Reply #1 on: February 26, 2008, 06:58:53 PM »
It is certainly an unusual form, Biodiversite. I usualy associate virus with streaks on the petals, in this case the streaks are missing! I think your forumist should isolate the pot for the time being until you get an answere.
 See Dominique's 'Sheila Anne Germany' in the Reticulata thread.
« Last Edit: February 26, 2008, 07:13:59 PM by David Shaw »
David Shaw, Forres, Moray, Scotland

mark smyth

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Re: a virosed 'Katharine Hodgkin' ?
« Reply #2 on: February 26, 2008, 07:07:07 PM »
here's the photo
Antrim, Northern Ireland Z8
www.snowdropinfo.com / www.marksgardenplants.com / www.saveourswifts.co.uk

When the swifts arrive empty the green house

All photos taken with a Canon 900T and 230

biodiversite

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Re: a virosed 'Katharine Hodgkin' ?
« Reply #3 on: February 26, 2008, 07:14:44 PM »
thanks for the redimensionned photo and the answer : then, if not a virus, what could be responsible of such aspect ?

biodiversite

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Re: a virosed 'Katharine Hodgkin' ?
« Reply #4 on: February 26, 2008, 07:20:04 PM »
then, the answer is perhaps there : http://www.srgc.org.uk/smf/index.php?topic=1194.225
it could be 'Sheila Ann Germaney' virosed...

Ezeiza

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Re: a virosed 'Katharine Hodgkin' ?
« Reply #5 on: February 26, 2008, 07:40:52 PM »
Hi:
    That 'Katherine Hopkin' material was virused has been known for years but this is true of several Reticulatas. Virus in the foliage is highly evident.

    The images show unusual stripes but the emerging foliage will show unmistakingly if the plant has mosaic or not.

Regards
Alberto Castillo, in south America, near buenos Aires, Argentina.

ashley

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Re: a virused 'Katharine Hodgkin' ?
« Reply #6 on: February 26, 2008, 09:46:50 PM »
Alberto,

So do you think that the converse is also true, i.e. that plants with apparently healthy foliage are probably not virussed (even if the flowers show some coloured streaks, as here for example)?
« Last Edit: February 26, 2008, 10:55:42 PM by Maggi Young »
Ashley Allshire, Cork, Ireland

biodiversite

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Re: a virused 'Katharine Hodgkin' ?
« Reply #7 on: February 27, 2008, 06:32:36 AM »
moreover, iris viruses are specific or not ? I think for example to Tulipa platystigma witch is always infected when coming from Holland...

Ezeiza

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Re: a virused 'Katharine Hodgkin' ?
« Reply #8 on: February 27, 2008, 12:45:04 PM »
Hi Ashley:
             
               I wish things were different but in Iridaceae viruses show in the flowers and not in the folaige at times. There is a virus that affects Babiana, Sparaxis, Tritonia, Dierama, Watsonia, Freesia, etc. that shows as darker stripes in the flowers but no signs are seen in the leaves. It is highly infectious and would wipe the plants. There is at least one strain that passes through the seeds to new plants.

               Using high nitrogen, the leaves of many bulbs develop a dark green colour that masks the virus symptoms in the leaves.

Regards
Alberto Castillo, in south America, near buenos Aires, Argentina.

Maggi Young

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Re: a virused 'Katharine Hodgkin' ?
« Reply #9 on: February 27, 2008, 12:51:49 PM »
Quote
There is at least one strain that passes through the seeds to new plants
AARRGH! Frightening prospect.
 Would you agree, though, that is is worth trying to take seed from most plants that one suspects with a virus, in order to get clean new stock?
How would the amateur grower recognise the particular virus which can be passed even through seed? ???
Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!

Editor: International Rock Gardener e-magazine

Ezeiza

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Re: a virused 'Katharine Hodgkin' ?
« Reply #10 on: February 27, 2008, 01:27:04 PM »
Hi Maggi:

              This particular strain was propagated in Southern England and the seeds were sown as "capable of reproducing the pretty markings in the flowers". The symptoms were darker color stripes at random along the veins.


              Of course, one can clean a particular species from "normal" viruses from seed. The problem is that when a plant shows visible symptoms it is already too weak to produce any seed.


Regards
Alberto Castillo, in south America, near buenos Aires, Argentina.

Maggi Young

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Re: a virused 'Katharine Hodgkin' ?
« Reply #11 on: February 27, 2008, 01:35:41 PM »
Quote
  The problem is that when a plant shows visible symptoms it is already too weak to produce any seed.
Well, that's not always the case: we have quarantined plants of other genera and got good seed from them before destroying the affected plants and in the context of this thread, we have specifically done this with Iris winogradowii.
Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!

Editor: International Rock Gardener e-magazine

biodiversite

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Re: a virused 'Katharine Hodgkin' ?
« Reply #12 on: February 28, 2008, 12:46:30 PM »
Maggi, do you have photos of this infected Iris winogradowii ?

Maggi Young

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Re: a virused 'Katharine Hodgkin' ?
« Reply #13 on: February 28, 2008, 01:01:08 PM »
No, Bio, I regret I do not have such photos.
Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!

Editor: International Rock Gardener e-magazine

 


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