Hibiscus Leave's 

I Have a Very Big Hybiscus Tree. When we moved in, it was riddled with bug's and disease, so i cut it right back and treated it. it is growing back well. how ever it now seem's that it has a different problem. It look's like the leave's have pimple's (White Risen dot's)and still hasn't flowered. Can some one please help me. (N.Hough)