Is this some kind of pinapple disease?

Question

Front sides of leaves have yellow-reddish-brown spots. In frist stadium these spots are white. On the other hand some leaves on their back side have brown strips. How to stop them forming?

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Answer 1

This appears to be Rust Fungus.
This article will help you.

https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm