cucumbers

HI everyone i am new here,i have got a cucumber plant that was doing great but now bottom leaves are wilting any idea what the promblem may be have a good day

 

Welcome to you.
Cucumbers are very prone to rotting at the point where the stem meets the soil so it is important to keep the soil here dry. I always water from the bottom (if in a pot) and if in the border sink a 2 inch plastic pipe down to the roots of the plant and water through this.

The leaves can scorch and wilt in full sun so give them some light shade using netting or fleece.
Good luck.