Tomato leaf curl - help

[jcaswell]

I have 6 tomato plants growing in my greenhouse, and a couple of them (one in particular) is curling up its leaves. These are curling longitudinally (along the length of the leaf), and the veins in the leaves are darkening. See below pictures.

There are no obvious other symptoms - no blotches. The greenhouse has got quite hot over the last couple of days, but I am keeping them well watered.

So - any suggestions please?

[jackarmy]

I think youve already answered your own question .
I tend to think it is simply the heat, i believe leaf curl is a built in self protection mechanism, other than maybe upping the water a touch i wouldnt worry too much.

[Thelma Sanders]

I've got 9 tomatoes in my greenhouse and only 2 of them are curling - one is near the door and t'other is under the window. I assumed it was cos they were in a draught

[Jungle Jane]

Tomato plants curl their leaves when they're not happy about something. If it's happening on the oldest leaves they can be cut off to help with air circulation. If there's not enough spacing between each plant,overcrowding can restrict airflow. If the greenhouse is getting hot in the day & then cold at night,it could be the change in temperature. Do you leave the door open during the hot days? Have you checked the plants for insects? The soil could be lacking nutrients? I feed a high potassium tomato feed once a week,it's for the fruits & flowers. Leaves curling is quite common,your tomatoes look great!

[skeggijon]

It's mainly due to lack of humidity. You can help by watering the floor of the greenhouse, but I really wouldn't worry about it. Lots of my toms have curly leaves and I've still got a bumper crop this year

[Potstubsdustbins]

Courtesy of Dr D G Hessayson author of the 'Expert' books.

'Unlike potatoes rolled tomato leaves do not indicate disease. The inward curling of young leaves is usually taken as a good sign if they are dark green. The rolling of older leaves is usually due to excess deleafing or a wide variation between day and night temperatures.'

This time of year I find it is usually the latter as I leave my GH door open.

[jcaswell]

Tomato plants curl their leaves when they're not happy about something. If it's happening on the oldest leaves they can be cut off to help with air circulation. If there's not enough spacing between each plant,overcrowding can restrict airflow. If the greenhouse is getting hot in the day & then cold at night,it could be the change in temperature. Do you leave the door open during the hot days? Have you checked the plants for insects? The soil could be lacking nutrients? I feed a high potassium tomato feed once a week,it's for the fruits & flowers. Leaves curling is quite common,your tomatoes look great!

Jungle Jane - thanks for your response. The plants are quite crowded (3 plants in a Grow Bag, and 2 Grow Bags) - airflow may be a problem. I do open the door and top vent. I will also open the louvre window now.

No insects obvious, and I give Tomorite as instructed about twice a week.

Fruit still very healthy.

So - I suspect heat and air flow.

Thank you very much

[jcaswell]

Courtesy of Dr D G Hessayson author of the 'Expert' books.

'Unlike potatoes rolled tomato leaves do not indicate disease. The inward curling of young leaves is usually taken as a good sign if they are dark green. The rolling of older leaves is usually due to excess deleafing or a wide variation between day and night temperatures.'

This time of year I find it is usually the latter as I leave my GH door open.

Potstubsdustbins - thanks - and thanks to Hessayon - I should have looked at him first. Encouraging.