Could be a bacterial disease?


My 23 days old tomato seedling cotyledons exhibit spots like chemical burn or bacterial. Please help me in identifying the problem.

Posted by: Jorge Hernandez (1 point) Jorge Hernandez
Posted: May 12, 2017

Mario H.Podliszewski commented,
Its difficult to give an opinion photo is not clare
about 3 years ago.


It looks very similar to black leaf spot caused by Xanthomonas spp. There are many species that cause such disease: X. euvesicatora, X. perforans (for warm climate), X. vesicatoria, X. gardneri (for cooler weather), and less common X. campestris pv. raphani & X. arboricola. Correct identification of the species is possible by PCR, ELISA, or microbiological analysis of isolated bacteria. The disease can be seed-born.

Posted by: alex ignatov (33 points) alex ignatov
Posted: May 12, 2017

Jorge Hernandez commented,
Thank you very much Alex for your help. Best regards
about 3 years ago.

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