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White spots on my plants: Magnesium deficiency or spider mites?


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I've noticed some of my plants have white spots appearing on them and was wondering what the likely causes were...heres some pictures

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JJ Bones

Nug of the Month: Feb 2013
Kind of hard to tell with these blurry pics, however it might look like some PM. Not sure though...if you think spider-mites, try looking on the bottom-side of the leaves with a scope.
Don’t just think or assume and jump the gun. Get a 120x microscope and look at the leaf, if there are trail marks then u got notes if not I wouldn’t worry so much. You are growing outdoor and your plant is a eco system or soon will be. I am not an experience grower at all, but it seems you need a good rain storm. It solved my problem.
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