Cal/mag def? Help please

Its been raining hard last 2 days, upon looking at my plant ( inground) i discovered some spider mites :/ which i guess imma try that citric acid for those but what is up with these fan leaves, they have brown spots on them, they don't wipe off. I just fed her right before the rain and added a tsp of cal mag to jacks bloom booster. All the rain probably flushed nutrients away. What do yall think? Is it cal mag,or something else.

prob just a little rust from cal/mag. id checkout N-Force its a foliar spray so don't get it on any buds, but its organic i've had great success with it and all pests hate it just spray some around the base and on any fan leaves away from buds