Hi I'm Stan DeFreitas, Mr. Green Thumb. How do you control rust on roses. Well rust is a fungus. Typically just like black spot, you are normally going to check the foliage over on a regular basis. I do it daily, go out and take a look at your rose, smell the rose, enjoy the blooms, but check for the foliage. Rust is just as the name implies, it looks like rust. It's sort of an orangy dust that gets on the foliage. And where it starts to grow into the leaf, the leaf will start to curl up and it will start to die. So check your foliage closely, and you may want to spray with a general fungicide type material. There is also some different products that you can get, if you want to go into a chemical type thing that have both the plant food and the fungicides built into them. They will be of some help. You may also want to think about doing some spraying. If you get your sprayer out, use something like Dithane 45, or Daconil or one of the Funganex products that you can get almost any nursery, garden supply store, and spray the plant from head to toe. And it should give you some pretty good control on rust. Also, of course go in there and take care of the bad leaves, get rid of those bad leaves and make sure you spray the plant on both sides of the foliage and you should take care of that rust problem. Rust is one of those problems that will show up on roses almost every season. So it's something you have to be aware of, and if you treat early, you probably won't have nearly as much trouble with it. For askmrgreenthumb.com, I'm Stan DeFreitas.