Beginner Gardening: Any specific should I do about these roses?, 1 by sunray2003

sunray2003 wrote:
Hi,

This is my second year having these roses. I live in Bay area. I forgot to prune the roses last december and did some pruning early last week. Here are 2 issues I noticed
a) I noticed lot of white pale coating on the leaves on the first rose. I also noticed the roses were not fully blossom. So I did the pruning assuming the white coating is some disease.
b) On the other plant , you can notice the stem does not seem to be strong.

Again, the only fertilizer I have are the Miracle gro (24-8-16) and Sta-green (10-10-10). Which one should I use for these ?