Q.How to treat Hydrangea Bush rust
Rust spots are on my leaves, pale green to yellow. What causes the rust?

Nikki
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on August 1, 2012
Rust is caused by a fungus and it will appear as more of an orange or rust color. Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm
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