tomato problem

 Evening all

                 I wonder if anyone could help. Six of my toms have turned bright yellow around the
                   growing tip and top leaves. I think it started around the time when the temp got
                   down to six c one night. the other six plants seem fine.

         Hi mumofstig

                Yes the leaves still have green veins, apart from the top of the growing tip and top leaves
                    the plants look  perfectly healthy.

Could it be sun scorch?

Mine went like that when we had the extremes of temperature with very hot days and then extremely cold nights. My plants weren't as big as yours, though, but the growing tips looked just like that.  They failed to grow after this, and I thought I might get away with waiting for some side shoots and choosing one to be the new leader. Alas - no side shoots to speak of were forthcoming. I took one of the plants out of the border and the roots looked wizened so I threw most of the plants away and started some more, which are now only about three inches tall. One of my friends gave me some of her spare plants, for which I was very grateful, and I cut my remaining 'poorly' tomatoes off leaving just three pairs of leaves at the bottom. I them re-planted them more deeply to try to encourage more roots to grow. Checked them today, and it looks as if some of them might grow on ok.  If I don't produce tomatoes my hubby will give me the sack, because he hates supermarket ones, and really looks forward to the home grown variety!

              Thanks jaydig, I think your right. I did have a very warm day ( in the greenhouse)
                followed by a chilly night, the tempreature swing would have been extreme.
                  Thanks goosegirl, one side of the gh is quite shaded, but the plants on that side have suffered
                    also. so, ha ho, of to the garden centre on sunday. Thanks very much all.