cucumber problems

[Robert T. McLaren]

I am growing cucumbers in a 'cold' greenhouse,early fruits were o.k now leaves are turning yellow and fruits are withering while very small.Help:

[sewer rat]

It could be a number of things from simple nutrient deficiency 9possibly magnesium - try adding Epsom Salts next time you water) to CMV (Cucumber Mosaic Virus). If it's the latter, it's bad news. Could you take a couple of snaps of the plant, leaves and fruits and post them so we can get a better idea.