Mini Rose Bush Question
Hi, I'm new to the community. I moved from Chicago to LA (entertainment industry) and had to give up most of my plants. I was gifted a mini-rose bush a couple months ago. I re-planted it and set it where it would get a lot of afternoon sunlight. It seemed to be doing really well. Earlier this week I noticed the newer leaves seem to have some sort of white powdery substance on them. What is this, and what needs to be done for treatment?