Preventing Bacterial Diseases of Tomato Plants

yumtomatoes(10a/FLA)September 11, 2011

I have some crown of thorns (euphorbia milii) that I suspect are infected with xanthomonas axonopodis pv. poinsettiicola. My neighbors have crotons that are probably infected with it, too. From what I have read, I don't think this species of xanthomonas is pathogenic for tomatoes. However, other species that are pathogenic for tomatoes are endemic where I live.

I would like to both treat my crown of thorns and prevent bacterial leaf spot on my tomatoes (which I think I had last year). I currently spray the crown of thorns with copper, which helps a bit and I sprayed the tomatoes with copper last year as I will again. I didn't spray the copper prophylactically on the tomatoes last year, only once I saw symptoms. This year I will spray prophylactically.

From all I have read, copper has some bactericidal effect, but the bacteria develop resistance over time so it is recommended to add other agents. I can buy manzate and streptomycin (agrimycin), both of which have been shown to kill xanthomonas as well as to help prevent the development of copper resistance by the bacteria.

Has anyone here ever used these products? The products are only available in large quantities, but the cost is less than my crown of thorns cost and I am ready to pull them and replant since they look so ugly. I thought I would give these products a try first and I could use them on my tomatoes, too, to prevent/treat bacterial leaf spot.

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