Dear honored researcher, I have attached few published papers that may guide you on how others did gene mapping in Cucumber. 

Thanks a lot Dr Ntambo, That is very helpful.

Look also at this

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4285734/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4835494/

Thanks Dr. Tripodi

Dear Mr. Rahat Sharif,

The most convenient method is to utilize F2 as mapping population but you can grow F3 to be more accurate other methods like RILs and NILs and DH production are lengthy. I am also attaching a PPT showing pros and cons of various methods it may be helpful to you.

Thank you so much sir g