Is This Rust Fungus?

  • Thread starter Buggins
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Buggins

Buggins

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The problem starts as small white patches, which become rusty, and then start spreading on the leaf. Usually it's the margins affected first, then moves inward. I've tried to capture a progression with these photos to show you how it starts and how it gets worse. Hoping someone could help me identify this quickly.

The plants are potted in sunshine mix #4, outside, getting all purpose 20-20-20 fertilizer once per week at 50% strength.
 
Whitespots
Is this rust fungus 2
Is this rust fungus 3
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