Hey Lime, where's my rep? Ohmy I'm still working the "bugs" out of this one, LOL. That would be a good subject; this time I won't steal anything from another site.
"first photo,under heat stress....when u click on it and it expands in the bottom right corner it says mag deficiency????.....is that right?? " That may be a pic of Mg def but it sure looks more like nute burn to me. I just snagged it off the net and that was the filename of the pic. Sorry for the confusion.
they might get a little confused by the heat stress one tho,normally its just the leaf edges that turn up,but the colour remains healthy.ive never seen heat stress as bad as in that picture before.