rust spots need help

[Needhelp146]

Not sure what this is. Can anyone help?
My first grow
using promix
dutch nut a and b
5m of a and b to 1L water 3 time week
I want to get them strong before I move them outside

Oh ya its a auto flower white dwarf (female) I hope

 

[Needhelp146]

Some more pics the bottom leaf is turning yellow and drying up I looked at all the pics on this site none match this problem.

Not sure what this is. Can anyone help?
My first grow
using promix
dutch nut a and b
5m of a and b to 1L water 3 time week
I want to get them strong before I move them outside

Oh ya its a auto flower white dwarf (female) I hope