I have a customer with scale thriving on the leaves. Is it too late to treat? What is the best way to rid the bushes of this problem? I have heard of people using tobacco (nicotene) to kill bugs on their property somehow as a synthetic (ground up cigs on the ground watered in). Sounds like bs to me. I've heard that oils aren't very effective on these guys because they are too tough. Do I need something toxic and/or a systemic? They are all in poor soil, planted next to each other (quick to spread bugs from one to another), and drought stressed heavily in the summer. I gotta save these bushes.