Quote Originally Posted by WashougalWonder
looks more like a P deficiency to me.

Night time temps? Does this effect all leaves or just the bottoms?

How do you know it is rust fungus? I need to learn about that I guess before I go spouting off too much.....
Haha.... I knew someone was going to say I had a nute deficiency. Its all good, and you cant really tell unless you go through the process of elimination.

So how I was able to tell is by this:

I've been using the exact same nutrients for over 2 years now. Almost everything is identical to what I've been doing for a while. All systems were recently cleaned out and fresh nutes were added.

The only thing that has changed, is the location. We moved into a bigger area (Small warehouse). The temperatures are VERY low in there at times. Cold, wet conditions are ideal for Rust Fungus. Its not wet in there, but it does get cold.

The number one thing that made me realize that this is Rust Fungus is that I brought in about 20 fresh plants from another grow site. These plants were very healthy when I first brought them in. We put them in a separate system, from the plants that already had this Rust Fungus on them. Within a few days, the new plants started showing signs of this Rust. Then a few more days pass by and there covered in it.

So that told me, that this is some how being transferred through the air. The only thing that would do something like this to my plants, that can be transferred through the air, are fungus' and mold's. They produce Spores and get blown around your grow room by the fans. Once these spores land on a plant, then the rust fungus starts to develope.

Right now.... my mind is set on a sulfur burner, but I have heard that if you've sprayed your plants with any kind of oil, like Neem Oil in the past 30 days, that entering Sulfur into your garden can burn your leaves. Still looking into it though.