What do I use on my knockout roses? I'm assuming it might be spider mites. I've already lost one whole bush and don't want to lose anymore.
Knockout Rose Spider Mites
The first thing to do is to make sure what insect you are battling for sure. Then go about treating it. You could get some Bayer Tree and Shrub granules and apply that around the rosebush. It feeds and provides systemic protection. It has helped me with may insect issues on roses, shrubs and trees.