16 days ago

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.

1 answer

alex ignatov 16 days ago

Jorge,
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.
Alex

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