Boron deficiency or rust fungus maybe even calcium deficiency?

[StevOrganic]

Just a quick one guys this rust spotting is on two of the larger fan leaves 3/4 the way to the top. I have kept an eye on it and it hasn’t got any worse in a week just 2-3 leaves showing one small spot?

As you can see the plant is very healthy but worse case scenario if it is rust fungus an auto his healthy 60 days in should be ok right?

 

[BII]

To me, with seemingly just 1 or 2 leaves affected, this is totally trivial. It could just be burning from nutrient drops. They look healthy and if it's not spreading, I wouldn' be concerned at all.

 

[Waira]

Not B mate, look at the Defc. Pic Depot thread in this section for pics... B is a micronute, immobile and will always hit tops first and worst.. wrong symptoms anyway; that looks more like Ca defc. to me,...