Clavibacter michiganensis susp. michiganensis was recovered from damaged lettuce seedlings in greenhouse and confirmed by PCR with two different methods.
I have heard about natural infection of Cmm on brassicas (Chinese cabbage), but not on Compositae plants.
Other species of Clavibacter can infect solanaceous plants (potato, eggplant, peper), legumes (alfalfa, beans), Poaceae (wheat, corn), reported on sugar beet. Several non-solanaceous plants, e.g. Datura stramonium, Chenopodium album and Amaranthus retroflexus, have been identified as reservoirs for epi-phytic survival and spread (Chang RJ, Ries SM & Pataky JK (1992) Local sources of Clavibactermichiganensis subsp. michiganensis in the development of bacterialcanker on tomatoes. Phytopathology 82, 553–560).
Is there any reports about Cmm as lettuce pathogen?
Hi,
maybe this paper could help you. However i didn't hear about Cmm infecting lettuce until now.
Article Biodiversity of epiphytic Pseudomonas strains isolated from ...
Maybe is a co-infection in this case?
Best regards.
Francesco Desiderio Thank you! I have not heard about it till yesterday too. This year is very "fruitful" for bacterial plant diseases.
Many bacterial pathogens such Clavibacter can be seed borne internally in the seed source.
It is unlikely that commerical growing mediums would be supporting this type of pathogen because of the way they are developed but it can be seed borne and a seed grow out test on diagnostic media could ferret out the diagnosis of that source or not.
So lets say you have a new report.
It would be good to isolate the pathogen. Confirm Koch's postulates
As for the proper identification the use of physiological multiple tests and PCR analysis would be wonderful.
The seed sources might be analyzed for seedborne presence and prevalance.
This can be done on diagnostic media after surface disinfection to find the internally seedborne presence.
Finally a look at the ability to treat to eliminate the internally seedborne presence might be recommended.
Doing this I believe you would be able to have an excellent research contribution.
As Alex says bacteria diseases of this type seem to be becoming more damaging lately.
Paul Reed Hepperly Thank you! It looks like gram(+) plant pathogenic bacteria have interesting time in their evolution.
Yes Alex the idea that plant bacterial were pretty much the gram negative tribe is not following so true as it used to be taught
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