Foliage Disease on Turkey Chomp

lee_71June 22, 2005

I have seen this disease on many of my tomato plants over the past few years.

It seems to always be limited to the lower leaves, and it doesn't seem to affect the plant in terms of growth or productivity.

I was just wondering what it could be.

Thanx for your help!

Lee

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carolyn137(z4/5 NY)

Lee,

I can't see the interior structure of the spots that clearly but it's either Septoria Leaf Spot, which I'm leaning towards, or Early BLight ( A.solani) and both are common fungal foliage pathogens and would be treated the same way.

The fact that you see it only on the bottom leaves means the infections are from splashback reinfection from previously contaminated soil since all NEW infections are airborne.

Carolyn

    Bookmark   June 22, 2005 at 8:04AM
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lee_71

The fact that you see it only on the bottom leaves means the infections are from splashback reinfection from previously contaminated soil since all NEW infections are airborne.

Probably so, but it is frustrating that this happened even though I put down a straw mulch. I have never mulched before, so I wanted to try it this year to see if it would help prevent splashback problems!

What are the distinct characteristics that distinguish Septoria Leaf Spot from Early Blight?

Lee

    Bookmark   June 22, 2005 at 8:35AM
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farkee(Florida)

Septoria has little black dots within the leafspot which are the fruiting spores of the fungus.

With early blight you may find concentric circles within the leafspot.

http://www.ento.okstate.edu/ddd/diseases/earlyblight.htm>

Here is a link that might be useful: Septoria

    Bookmark   June 22, 2005 at 2:54PM
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lee_71

Oh, so if it is Septoria, I should remove the infected leaves ASAP so no more fungal spores come into being?

Lee

    Bookmark   June 22, 2005 at 5:14PM
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farkee(Florida)

If you read the Early Blight link it also says this: "Thousands of spores are produced in spots of infected leaves that are capable of causing more infections. " so spores are not just a factor with septoria.

    Bookmark   June 22, 2005 at 5:57PM
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lee_71

Maybe I should invent a Carolina Quarantine Cage to help keep the spores away from other plants once disease hits!

Lee

    Bookmark   June 22, 2005 at 8:49PM
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