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 Post subject: Tot
PostPosted: Sep 1st, '16, 10:41 
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My toms were doing great, healthy, thick stems and rapid growth. Then one by one the leaves curled and they started losing color. This has affect 4 out of 6, with the remaining two looking great.

It seems to set in when they flower, but this may just be a coincidence.

Nitrates are in the red, ph is 6.4. I’ve only added a little iron (I’d run out) and a bit of potassium sulphate.

The weather is hot, (low to mid 30’s), very humid even for Thailand. Any suggestions?


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 Post subject: Re: Tot
PostPosted: Sep 1st, '16, 15:05 
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Look up physiologic leaf curl and you'll find several potential causes of the leaves rolling up, including hot weather, high nitrogen, low phosphorus, excess moisture...

http://cru.cahe.wsu.edu/CEPublications/ ... PNW616.pdf

There are also a number of viruses that can cause similar symptoms.

I'm guessing it's a combination of heat, variety, and nitrogen to phosphorus ratios. It may cure itself when the temperature drops but don't count on this happening.


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 Post subject: Re: Tot
PostPosted: Sep 1st, '16, 15:38 
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Thanks. That sounds right, except the fact sheet say is happens to older leaves first, which is opposite to my experience. I will add some shade cloth and reduce the water. For plants badly affected, would it be better to pull them out?


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 Post subject: Re: Tot
PostPosted: Sep 1st, '16, 17:32 
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Bordering on Legend
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Is it possible a mod can change the heading? I meant it to be "Tomato problem, advice needed.


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