[like diggingk]

they were fine had 6 leafs each then i noticed that some of the leaf have full off
i had a good look at one and when i touched it if come out of the soil no roots ?  
the other 3 have all done the same  

they were in the greenhouse one the floor
the one on the bench seem ok

[DD.]

That sounds like stem rot.

They could well have been over-watered and probably a bit cold as well.

[like diggingk]

thanks DD
they were in diffident soil to the other ones
only put them on the floor as ran out of room 

tom's and 6 other cucumbers will stay on the benches until the weather warms up

[GrannieAnnie]

DD's right.  When we went away 2 weeks ago, I gave my greenhouse a good watering and covered the seedlings with fleece.  When we got back everything looked fine, but I have now lost all 6 of my melons and 6 of my cucumbers to stem rot!

[sarajane]

Mine are still in the house, about 3 inches tall with 4 leaves but I know from past experience then can keel over for no apparent reason so I will be sowing 4 more this weekend as a type of insurance

I would say like DD  -  yours have gone with a combination of overwtering, cold and its been very damp too

[compostqueen]

They are such divas! I water mine only the tiniest bit on a warm day. Those have been few and far between so I've held off and touch wood they look fine.  For now that is, they seem to keel over without provocation    You can get them to a good size, and into their final pots yet they still have a death wish.  Why do we bother 

[like diggingk]

hope mine are ok 
2 have got 8 leafs and some buds they seam to like it were they are will cut down on the watering they been having the same amount as the tom's

sowed 6 more seeds on 23 April they got 2 leafs each there at home on the window seal   

[compostqueen]

I've not watered mine for ages as I'm afraid they'll keel. They look absolutely fine and dandy.
So, hold back on the watering. Water from the bottom and only a little bit and don't leave them sitting in it at any price

[A Reyt Tayty]

I'm down to the last cuke of a second sowing. When this one kegs over it's off to the garden center in a week or two and buy a ready made one.

[A Reyt Tayty]

They are such divas! I water mine only the tiniest bit on a warm day. Those have been few and far between so I've held off and touch wood they look fine.  For now that is, they seem to keel over without provocation    You can get them to a good size, and into their final pots yet they still have a death wish.  Why do we bother  

Divas dosent even start to describe 'em! I've one left. It looked sturdy enough. The seed leaves have given up the ghost, but it's got one nice true leaf and another starting to show. good stem. Being a nice warm day with a good bit of sun, I thought I'd give it a spell in the greenhouse to give it a bit more light. WRONG! 2 hours later, one very unhappy cuke. Leaf shrivelling at the edges and starting to wilt. Brought it back indoors and onto it's place on the windowsill and it looks as though it may recover.

Update: It didn't recover.