0
points
Stem rot symptoms were seen on greenhouse-grown tomato during the 2017 winter

Tomato    Italia

Affected tomato plants showed darkening of the stem and a severe stem rot symptoms. I think it's a bacterial disease... Which bacterium causes these symptoms? It is the first time that we observe this symptom. What can cause such disease?


Posted by: Dr. Raffaele Giurato (6 points) Dr. Raffaele Giurato
Posted: April 18, 2017




Answers

2
points
Is there any infection on fruits? Also, is it possible to upload images of split open stem?
I think it could be a bacterial canker disease caused by Clavibacter michiganensis.

It is a seed borne disease quite common in greenhouse tomatoes. The symptoms may vary depends on age of plant, type of infection, environment and other factors. In general, the infected leaves exhibit irregular shaped water soaked lesions in between the veins, which later turn to light tan, necrotic and dark brown. Infected plants may wilt and die. Stems also shows sunken, necrotic lesions. The vascular system shows brown streaks. Yellow sticky fluid will ooze from infected stem.

http://ag.umass.edu/vegetable/fact-sh...
http://extension.msstate.edu/content/...
http://www.extension.umn.edu/garden/f...


Posted by: Dr. Ravishankar Narayana (10 points) Dr. Ravishankar Narayana
Posted: April 18, 2017




2
points
I support opinion of Dr. Ravishankar Narayana, but must say that the symptoms do not look typical for Cmm. It is impossible to identify bacterial pathogen by symptoms only. It looks like the bacteria can be easy isolated in pure culture on non-selective medium.


Posted by: alex ignatov (33 points) alex ignatov
Posted: April 18, 2017




1
point
Dear Narayana,
I think it's not C. michiganensis, because, in all cases, we have not observed the symptoms in the fruits.
This disease has affected several farms also very far apart. We had never observed such symptoms.
I think it's a bacterial disease... but to know the species only through isolation! :/


Posted by: Dr. Raffaele Giurato (6 points) Dr. Raffaele Giurato
Posted: April 18, 2017


Dr. Ravishankar Narayana commented,
Then certainly you should try to isolate the pathogen as suggested by Alex. Do you have any facility nearby for this?
over 2 years ago.

Dr. Raffaele Giurato commented,
Yes, I'll take and send the samples at the university for isolation. Thank you so much !
over 2 years ago.

Dr. Ravishankar Narayana commented,
That's very good. Please let us know the result. Thanks
over 2 years ago.



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