If it is mites then you will see lil yellow spots on the tops of the leaves and you can findout by useing a magnifying glass to examine the bottom of the leaves for lil black dots that move also look for tiny webs between branches and main stem
It's kinda funny that I helped housing your mysterious rust spots one of the leaves on my auto la diva ha mysterious rust colors spots on it and it's only one leaf tho so I'm gonna see if my tea helped it cuz my tea has p/k in it not much k tho (k = mag if you didn't know) I gotta get more guanos to mix up in my tea
It's kinda funny that I helped housing your mysterious rust spots one of the leaves on my auto la diva ha mysterious rust colors spots on it and it's only one leaf tho so I'm gonna see if my tea helped it cuz my tea has p/k in it not much k tho (k = mag if you didn't know) I gotta get more guanos to mix up in my tea