Question
I have a cucumber plant in the greenhouse. The older leaves are yellow turning crispy and brown. the new leaves are green. I have had two fruits off it but I have noticed some of the new fruits are going yellow and look to be dying at about 3cm long. Please can you help, I have treated with Epsom salts but it hasnt worked.

Answer
Dear Gaynor,
I can only answer this from a natural, organic perspective.  This is pretty much the lifespan of a cucumber plant.  Plants grown indoors, don't usually produce as plentifully as those outdoors, but once they have reached their maturity and normal life span, they just barely perk along.  My outdoor cucumbers now look like you are describing yours.
Kind Regards,
Kindred