This is my first year with Elephant Ears. I have both Black Magic and Maui Gold. The Maui gold has bright yellow spots with brown dots. It was very minor 3 days ago and I sprayed with a Neem oil and Copper mixture. Now it's gotten very bad and I don't know what to do or what it is. I thought it was some kind of rust but the spray should have taken care of that. Is it getting too much water? As you can see the black magic is fine. I have now cut off the bad leaves in hopes of it not spreading more. It gets about 4 hours a day of direct sun and bright shade the rest of the day. I have a Black Magic on the other side of my deck that gets about 7 hours of direct sun a day and is doing great also.
