how to fix rusting leafs

I thought this might be of interest to you:

Lets Talk About Rust Fungus & What You Need To Know.

What Is Rust Fungus? Rusts are plant diseases caused by pathogenic fungi of the order Pucciniales(previously also known as Uredinales). About 7800 species are known. Rusts can affect a variety of plants; leaves, stems, fruits and seeds. Rust is most commonly seen as coloured powder, composed off...
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This looks like a deficiency. Now, rather that's due to ph being off (locks out certain nutes from the plant) or just a lack of nutrients imputed is impossible to say by looking at a picture. Looks like week 2 of flower. What medium are you growing in? What nutrients are you using?
 
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