Once the small foliage looks like it is just about died off cut it off at the base cause it isn't helping your plant at all. Dolomite lime is used to lower the Ph of soil so I doubt it has a serious effect upon your current problem. Another thing, I highly doubt the yellowing is from spider mites. Spider Mites cause small holes in the plants not yellowing. I believe that your yellowing is most likely caused by a Nitrogen defecency. A nitrogen defecency is normal during flowering. Let me ask a couple questions.

1) Have you been using any nutes and if so did you switch recently?
2) What light cycle have you been using and have you changed it recently?
3) Did you top (cut the growing shoot off) or pinch you plant to give it its four tops?

Happy Toking :rasta:
kush07 Reviewed by kush07 on . First Post! - may need expert help Pls Hi guys, Its my first Post ! I looked at other boards but this one has given me much help since i started growing. I got my first 6 plants at 7 weeks now. I grew them from seed and only lost one :) - Thay are a mix of White widow and Bubblicious. I ned your guys expert opinion. ..do they seem Ok to you ? . Few things I worry about is 1. about a week ago small lower foilage leaes turned yellow and died. 2 One of the Bubbles has sprouted about 4 heads ..looks like a tree ! 3. I am getting Rating: 5