Rust prevention is constantly spraying a multi-use fungicide. For me I can't spend that much time so systemic protection is required. I have found a great systemic fungicide that has multi-day protection made by Spectracide. Not sure how it will work on rust but by far the best fungicide I have found for the balance of fruit trees & grapes on the place here. Immunox here is the link
Spectracide Immunox(R) Multi-Purpose Fungicide Spray Concentrate For Gardens | Spectracide


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