A bit of background: for the last few weeks I've been battling an aphid infection - I've cut back on nitrogen-based fertiliser, and sprayed a couple of times with dilute washing liquid. So if any of that might be the cause, let me know!

Otherwise, the problem is I've got this leaf curl, which really doesn't look very happy, and now a kind of browning (which is a little moist) at the base of some of the stems. The plants were perfectly happy until recently and I am frankly a little confused as to how they have gone so wrong so fast!

Any ideas for what is wrong, and what i can do, would be gratefully received!

Nitrogen-based fertiliser, is not needed with new soil. If you use it you will cause the plant to produce more foliage than tomatoes. The extra nitrogen causes a very dark green color to the leaves and weakens the plant and help bugs and disease to attack the plants.

Nitrogen does two things to the pH when it comes in contact with the soil. Ammonium Nitrogen will drop the pH like a rock and Nitrate Nitrogen will raise it to a alkaline range. So the problem you have is caused from the introduction of Nitrogen when it wasn't needed.

oneeyeluke said:Nitrogen-based fertiliser, is not needed with new soil. If you use it you will cause the plant to produce more foliage than tomatoes. The extra nitrogen causes a very dark green color to the leaves and weakens the plant and help bugs and disease to attack the plants.

Nitrogen does two things to the pH when it comes in contact with the soil. Ammonium Nitrogen will drop the pH like a rock and Nitrate Nitrogen will raise it to a alkaline range. So the problem you have is caused from the introduction of Nitrogen when it wasn't needed.

What should I do? Do I need to replant in virgin soil? Or are the plants too far gone to save