photo

Don't know, some sort of Squash, maybe like this one below? Says it is common in India?

...Desi Summer Squash ...

In any event, I might try the Desi next summer.

concur: looks like the Desi. Possibility is the lemon squash but color does not seem right.

I searched and perhaps it is apple gourd. thanks anyway.

apple gourds are green and turn that color when dried

Concur. It is also a vining plant and your photo shows a bush type. The Apple gourd ( (Lagenaria siceraria ) also has white blossoms. Blossoms are not clear in photo, but I think I see some squash yellow.