Uhmm well i have the same problem but i think it could be helpful for the dev team to know much more about these "white dots" (in close view you can easily see the bug). As Dogtags has said it affects mostly pine trees but i have seen the same bug with other trees or bushes and some sun glasses.
The bug vanished at night so i guess it is related to the light sources.
I have XP and use the last NVIDIA driver 190.15.
Regards A.U.