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What are these yellow spots and how should I treat it?

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What are these yellow spots and how should I treat it?

Post  dstack on Sat 11 Jan 2014 - 15:52



These spots are only on some of the older leaves. I'd like to get it under control before it spreads all over. Is this what they call downy mildew? And what do you suggest I do besides destroying the worst of the leaves?
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Re: What are these yellow spots and how should I treat it?

Post  camprn on Sat 11 Jan 2014 - 17:22

Please post a wider shot of the plant, there is so little to see here. To me this looks like maybe water spots from splash... and not much more.

If it's only on a few leaves and it's making you crazy or cautious, I suggest just prune the leaves off.

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Re: What are these yellow spots and how should I treat it?

Post  yolos on Sat 11 Jan 2014 - 17:48

Doesn't look like downy mildew to me.  Check out this website and also look at the underside of the leaves on your plants.  Also, what type of plant has the spots.

http://vegetablemdonline.ppath.cornell.edu/NewsArticles/Cuc_Downy_Mar06.html
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Re: What are these yellow spots and how should I treat it?

Post  camprn on Sat 11 Jan 2014 - 18:06

A wider shot of the plant really would help me wrap my brain around the issue. From what I can see in the photo posted, this link looks like it may have some reading value. I am not diagnosing the problem.

http://extension.umass.edu/vegetable/diseases/fulvia-leaf-mold-tomato

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Re: What are these yellow spots and how should I treat it?

Post  dstack on Sat 11 Jan 2014 - 20:50

I'll have to get that in the morning, but honestly, the rest of the tomato plants look quite healthy and normal.
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Re: What are these yellow spots and how should I treat it?

Post  malefacter on Sat 11 Jan 2014 - 21:09

there yellow ish but i cant tell arethey fuzzy?
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Re: What are these yellow spots and how should I treat it?

Post  dstack on Sat 11 Jan 2014 - 21:18

No, it's just a dicoloring of the leaves in spots.
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Re: What are these yellow spots and how should I treat it?

Post  dstack on Sat 11 Jan 2014 - 21:22

I'm a little surprised that I seem to have stumped everyone here. I see these spots every time I grow tomatoes. Last year it killed all the leaves and I thought the plants were gone for good, but a vigorous new growth gave the indeterminates a second chance.
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Re: What are these yellow spots and how should I treat it?

Post  malefacter on Sun 12 Jan 2014 - 2:26

well there are several things that can caws yellowing so the more info you give the better you may have some kind of imballance in the soil for instance like to little N did you use the pre made mel mix or did you make your own ?
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Re: What are these yellow spots and how should I treat it?

Post  camprn on Sun 12 Jan 2014 - 4:33

dstack wrote:I'll have to get that in the morning, but honestly, the rest of the tomato plants look quite healthy and normal.
Oh terrific! If the rest of the plant looks good, my suggestion is to remove the unsightly leaves and don't worry overly much okay . If you seem more of these or similar spots come out on your tomato plant foliage, checking in with the Extension Service Agriculture Agent would be the best thing to do for positive identification and any recommendations for necessary effective treatment. If the office is far away, email would probably work well for communicating with them.

Did you read the article to the link about fungus I posted? Are your garden conditions anyway similar to what was listed there?

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Re: What are these yellow spots and how should I treat it?

Post  dstack on Sun 12 Jan 2014 - 5:28

malefacter wrote:well there are several things that can caws yellowing so the more info you give the better you may have some kind of imballance in the soil for instance like to little N did you use the pre made mel mix or did you make your own ?
I made my own. But, like I said, I've seen this every time that I've grown tomatoes here in S. Florida. This is my first time doing it in a SFG. I know there's are deficiencies in my MM from other problems I'm having. I'm waiting on soil test results.
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Re: What are these yellow spots and how should I treat it?

Post  dstack on Sun 12 Jan 2014 - 5:35

camprn wrote:
dstack wrote:I'll have to get that in the morning, but honestly, the rest of the tomato plants look quite healthy and normal.
 checking in with the Extension Service Agriculture Agent would be the best thing to do for positive identification and any recommendations for necessary effective treatment. If the office is far away, email would probably work well for communicating with them.
I emailed them before about this, but the master gardener that I know there is not very responsive to emails. I'll try again. 

I skimmed the articles, but I'll take another look. Thanks!
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Re: What are these yellow spots and how should I treat it?

Post  camprn on Sun 12 Jan 2014 - 5:59

dstack wrote:I'm a little surprised that I seem to have stumped everyone here. I see these spots every time I grow tomatoes. Last year it killed all the leaves and I thought the plants were gone for good, but a vigorous new growth gave the indeterminates a second chance.
We, all of us, are stumped at some time or another. I don't know that there is a horticultural professional that actually is a member here; a lot of us are relatively new gardeners but some members here have been gardening for decades and have seen and know quite a bit, but not everything. I think we are all still learning. Wink

If you have kept garden and weather records, have you looked back at the conditions in the garden when you had this trouble with your tomatoes last year? If so, are you having similar conditions now?

http://extension.ifas.ufl.edu/

http://edis.ifas.ufl.edu/pp121




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Re: What are these yellow spots and how should I treat it?

Post  dstack on Sun 12 Jan 2014 - 7:52

My best record journal is contained in the properties of each photo I take. I'll have to check out the date that I took the photo last year. Also, the above  photo that I took of these spots was taken a few weeks ago. I noticed this morning that the spots are not quite so defined anymore. They are more like blurred smudges of yellow on the leaves. I'll get a fresh photo when I get home. 

Thanks for the clarification about the "stumped" thing. I'm only 45, and already planning to get my master gardener certification when I retire. Why wait? Their class hours don't coordinate with my full-time work schedule. And my garden is like a second (part-time) job.
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Re: What are these yellow spots and how should I treat it?

Post  camprn on Sun 12 Jan 2014 - 7:59

If you have the date of the photos, you can check your area weather history with this site to determine the relative humidity, and such, for the historical dates you know. This could give you some useful info regarding known conditions for plant diseases in your area.
http://weatherspark.com/#!dashboard;a=USA/FL/Boca_Raton


I have a similar problem finding the time to take the Master Gardener classes in my state, but a lot of the information that MG receive in their classes is available online. For example:

http://edis.ifas.ufl.edu/

http://www.gardening.cornell.edu/education/mgprogram/mgmanual.htm

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Re: What are these yellow spots and how should I treat it?

Post  dstack on Sun 12 Jan 2014 - 12:48

Camprn, thanks for the info and links. 

Here's what the yellowing look like now. You can also see something nibbled at some of the leaves, but that's another issue that isn't as concerning. From what I read in one of your links it looks like the common tomato bacterial fungi that we get around here. I'm heading out now to prune those leaves off.   Wink 

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