tip roll, pale spots on tomato seedling leaves

joannaqcw(NY 4/5)April 19, 2012

My tomatoes are 5 weeks old, generally fast-growing and healthy-looking. Ever since I started putting them outside on warm days (over 50; in a sunny spot, slightly sheltered but still gets wind), a few leaves have rolled at the tips. I figured it was just stress. Today I found this spotted leaf (oldest true leaf on its plant) with a rolled tip and began to wonder if I was actually dealing with a disease (powdery mildew? I know the kale in the greenhouse had that months ago, but I thought it was species-specific....gray spot? bacterial spot?) A couple of other plants had older leaves with whitish tips. I've attached the spot pic; I think maybe you can see bigger pix of the spot and the white tip here:




Any ideas greatly appreciated.

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Tiffany, purpleinopp GardenWeb, Z8b Opp, AL(8B AL)

Google images of tomato blight and see if you think that's a match.

    Bookmark   April 19, 2012 at 3:06PM
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ken_adrian Adrian MI cold Z5

did you harden them off to direct sunlight.. or just take them straight outdoors .. even greenhouse glass tempers direct sun ...

in my z5.. tomatoes go in the ground mid may ... and you are z45 .. i wonder if blight is even possible in these temps??? my nights are still falling below 35 degrees ...

i suspect cold damage or hardening off issues .. and yes.. i am presuming you are taking them back in at night ...


    Bookmark   April 19, 2012 at 3:53PM
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joannaqcw(NY 4/5)

Thank you both. Purple, I've had tomato blight before, both late blight and early blight (though never on seedlings), and I don't think this is it--the spot color is different and it isn't spreading in the same way
Ken, I had them in the greenhouse in the sun for their first 3 weeks, then put them outside for an hour or so and brought them back into the greenhouse, then left them out for longer periods of time. They still come in at night as we're still getting freezes--I think the lowest temp they've been exposed to is 45 (though with strong wind it might affect them as if it were colder).
I was hoping this was just environmental stress, wanted to check if it looked like a disease anyone knew. Thanks for your time and thought.

    Bookmark   April 19, 2012 at 5:02PM
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jean001a(Portland OR 7b)

It's not a disease. It's environmental stress.

    Bookmark   April 19, 2012 at 6:29PM
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joannaqcw(NY 4/5)

Good. I can deal with that. Thank you all!
I seem to suffer from vicarious hypochondria--I don't obsess over my own sniffles, aches and lumps, but tomato spots tend to precipitate a panic.

    Bookmark   April 19, 2012 at 6:59PM
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