Having white spots on the ground while rendering

Greetings everybody,
i am having a problem with rendering my kitergarden. i Tried every possible way to remove those white spots but Somehow I cant get rid of them, If any of you have any Idea what the problem is or how I can fix it please do let me know the Fix
Thank you in Advance

What rendering program?

Vray in sketchup version 2016 3.4

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