Black Stuff On Leaves

[min7b5]

So I have two Skunk X Afghan clones in my Portland back yard. Both are otherwise looking good and seem healthy, but one is getting this black discoloration on many leaves. Any ideas what is happening?

 

[slyone]

Some sort of mite attack ?

 

[min7b5]

I sure hope not

 

[thegreensurfer]

Have you supplied calcium and magnesium to the soil? Has it rained a lot lately?

 

[min7b5]

Have you supplied calcium and magnesium to the soil? Has it rained a lot lately?

No. And yes.
Maybe I should get some Botanicare Cal Mag?

 

[thegreensurfer]

Yea get some powdered dolomite lime or the CalMag.
If you had a good amount of rain it can leach ca and mg from the soil.