The symptoms shown on attached pictures were found among tubers of one commercial stock of potato seeds. What is this? Nematode, insects, or fungus? Tubers were sent to experts but, maybe, somebody knows the reason already...
in my idea it was start by insect then bacterial infection lasted by necrotrophic fungus,
the soft rot ring in tuber is similar to Ralstonia solanacearum or Clavibacter michiganensis.
Meysam, thank you!
Can it be Tobacco Necrosis Virus transferred by Olpidium brassicae?
if it was any report in your aera previously about this virus, yes it could be
Looks like potato dry rot = Fusarium solani , but could also have secondary Erwinia soft rots present.
You can confirm the fungus by isolation in a humid chamber and incubation at 22°C. If no, it could be Erwinia carotovora pseudomonas; you can also pass by isolation.
Alexey. Do not fully disclosed subject. It seems that there is a complex disease. Tell me, what comes out of the infected tubers (bacteria, or fungi? or nemathode (some properties of their culture))? At first sight - dry rot (FUSARIUM), but why only on the surface of the tuber. whether in the central part living cells?
@Igor,
The tubers indeed have some features of insects/nematodes damage, but, I would not say that they have obvious symptoms of Fusarium solani. Bacteria of Pectobacterium spp. are present in small amount. There is no other bacterial pathogens. The most obvious characteristic trait of this tubes: rot of outer tissues of tuber (above vessels ring), and inner tissues are less affected. I would suggest nematode+fungi or necrosis virus +fungi.
Regards
Alex (Alexander)
I agree with Mr Taghinasab based on the macroscopic tuber symptoms...
Best regards, Laszlo Gergely, ret. Potato Trials Officer, Plant Path.
The symptoms on potato (indicated by your photos) strongly resemble the same symptoms of bacterial ring rot caused by Corynebacterium michiganensis subsp. sepedonicus as shown in the photos of the attached extension fact sheet from Washington State University. Do the symptoms of the affected adult potato plants match also (i.e. rosette etc.)? This is another possibility of the cause. See also the link to this publication.
http://mtvernon.wsu.edu/path_team/Potato-bacterial-ring-rot-WSU-Extension-Fact-Sheet-FS102E.pdf
Thanks to everybody who discussed this question 3 years ago - this year I met the same type of disease and was ready for PCR analysis - it was a mix of Fusarium solani with Pectobacterium spp.
I wish you a Happy New Year 2019!
Alex
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