Only the last photo shows evidence of rust. Not saying you arent seeing it spreading, but a lot of your yellow streaking could just be normal drying down during bulb formation.
Mine are really starting to show yellow and I just removed scapes.
Every year this stage is a mental hurdle because my eyes and brain sub-consciously tell me something is wrong with my crop because is starts to look so "bad".
Really, top growth is just ending and sending product to the bulb.
As far as you saying its spreading, are you seeing the dark, raised pustules like on your last photo? Or is it just paling, yellowing leaves?
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