Is it blight? (Tomatoes)

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Goldfinger

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Is it blight? (Tomatoes)
« on: August 05, 2012, 19:32 »

As my toms' are growing, the leaves are then curling and twisting into very horrible deformed shapes.  :(

Even though there is no signs of blackening or rot anywhere else on the plants, is this some kind of 'blight'??

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arugula

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Re: Is it blight? (Tomatoes)
« Reply #1 on: August 05, 2012, 19:34 »
Pictures would be helpful. It may be some other kind of "stress".
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Yorkie

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Re: Is it blight? (Tomatoes)
« Reply #2 on: August 05, 2012, 20:08 »
What are you growing them in?  Was any manure added?
I try to take one day at a time, but sometimes several days all attack me at once...

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Goldfinger

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Re: Is it blight? (Tomatoes)
« Reply #3 on: August 05, 2012, 20:35 »

It's only happening in the poly', which is what I don't understand as there was manure added to both the GH and poly - virus/bug in manure?

I grew potatoes in the poly' first, then the toms', so I'm a bit confused....  ???

As the poly was built last year on 'new ground', and this year being it's first growing year, could it be something that was in the ground already?

I know that part of where the poly sits, there was a chicken run, the other half was just 'wasted space'.

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sunshineband

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Re: Is it blight? (Tomatoes)
« Reply #4 on: August 05, 2012, 20:39 »
I've had leaves like this in the greenhouse this year. I think it is something to do with stress rather than disease, being too hot for example

Of course it could be a response to aphid damage, or to herbicide use. With mine I know neither of these are the cause, but I thought I should mention them.

Sorry, didn't mean to sound smug
« Last Edit: August 05, 2012, 20:44 by sunshineband »
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Ice

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Re: Is it blight? (Tomatoes)
« Reply #5 on: August 05, 2012, 20:46 »
The leaf roll is more than likely due to fluctuating temperatures, so stress, but a picture would help to make sure. :)
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GrannieAnnie

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Re: Is it blight? (Tomatoes)
« Reply #6 on: August 05, 2012, 22:16 »
A lot of my tomato leaves are misshappen too.  It isn't blight in the polytunnel, but I know I've got it outside a bit, but got rid of the worst ones and dug up the tiny potatoes that had it.

Fingers crossed that the rest of the toms will be okay.

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angelavdavis

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Re: Is it blight? (Tomatoes)
« Reply #7 on: August 06, 2012, 14:51 »
Goldfinger, is this occurring to the new growth at the top of the plant?  If so, I have an identical problem and thought it is down to a virus in the manure which I added to the planting compost.  I even bought the manure from a local GC rather than from the farm.  However, sunshineband might be right about it being stress, although they are not showing any other symptoms and appear otherwise healthy.
« Last Edit: August 06, 2012, 14:53 by angelavdavis »
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Goldfinger

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Re: Is it blight? (Tomatoes)
« Reply #8 on: August 06, 2012, 16:25 »

Not really, it happends as the plant grows. The leaves form - look nice and healthy, then as they get bigger, they start to twist and deform.

If it is stress due to temperature fluctuations, how can I minimise it?

I've kept the doors at either end open all the time, once the winter and spring had passed, so I wonder how I could keep the temperature constant?

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pink aubergine

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Re: Is it blight? (Tomatoes)
« Reply #9 on: August 11, 2012, 08:06 »
Its really difficult when the weather is hot during the daytime and getting into the mid high 20's(degrees C). You can either install shading netting, but to tell you the truth the leaf roll doesn't tend to effect the production of tomatoes unless the leaves dry out excessively, to the point that they can't photosyntesize.
You can bring the temperature down by spraying water on the floor and leaving buckets of cold water around.

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Goldfinger

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Re: Is it blight? (Tomatoes)
« Reply #10 on: August 11, 2012, 09:33 »

I have some photos now, if it helps.....






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Goldfinger

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Re: Is it blight? (Tomatoes)
« Reply #11 on: August 11, 2012, 09:42 »
I've had leaves like this in the greenhouse this year. I think it is something to do with stress rather than disease, being too hot for example

Of course it could be a response to aphid damage, or to herbicide use. With mine I know neither of these are the cause, but I thought I should mention them.

Sorry, didn't mean to sound smug

I haven't spotted any aphids, or used any herbicides.

But I think you're right about stress, if that's what causes twisted / deformed leaves and stems.

Is it something to do with, one minute cold wet and raining - next screaming sunshine, hot and maybe humid, not like a 'steady / even' temperature?

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pink aubergine

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Re: Is it blight? (Tomatoes)
« Reply #12 on: August 12, 2012, 21:42 »
I hope its stress, however the pics show quite deformed  leaves, which may be due to a herbicide called aminopyralid. Its sprayed on cereals and then the straw left after harvest is baled and sold to horse owners who use it in stables. The herbicide is carried in the manure and affects the crops in the year following use, which is how it gets into greenhouses and polytunnels even if you haven't used it yourself.
There are certain crops that seem to be more affected, tomatoes and potaoes being a couple, sadly it often causes the plants to be blind, so sadly no tomatoes.
But you'll just have to wait and see, but I do hope its stress for your sake.
(The same manure the following year will not have the same problem, damage only last one year)

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mumofstig

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Re: Is it blight? (Tomatoes)
« Reply #13 on: August 12, 2012, 21:59 »
Aminopyralid usually causes ferny foliage and it doesn't look like that to me ;)

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Ice

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Re: Is it blight? (Tomatoes)
« Reply #14 on: August 12, 2012, 22:06 »
Aminopyralid usually causes ferny foliage and it doesn't look like that to me ;)
Nor me. :)



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