blueberry leaf rust
How do I eliminate the "rusting" of the leaf tips of my blueberry plant?
This article will help you with your rust problem: https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm
I would recommend treating the blueberry rust with neem oil. It is organic and people/ animal safe. Here is more information on it: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm