Any specific should I do about these roses?

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 ?

Here is your picture with some questions:
Red: The part growing above this point is the part with nice flowers. If any stems or leaves come out from below this point remove them. Below is a sturdy root, but the flowers are not so great.

Yellow: This might be coming from below the graft.

Blue: This leaf looks like it has powdery mildew. This is a very common fungus of roses. You can spray to minimize it. You will not get it under control by pruning off all the affected leaves. The next leaves that come out will just get it because the spores are blowing around all the time, all over the place. Read up on it. It is one of the few fungi that prefer mild to warm, dry weather. (Just what we have been having most of the winter).

Overall: This rose has been pruned in a way that makes it lop-sided. All the growth is way out of the pot, all on one side. Perhaps there were no well placed branches. I would work to bring it back to being centered by encouraging any growth in that general direction.
If you look down from above, it would be good to have 3-5 main branches radiating out like spokes on a wheel. So watch for some buds starting to grow that way.

The other one at least has some growth in each direction, but the left is so much taller! I would prune this back so the whole plant is more symmetrical.

OK, so here is the pic.

Pruning Roses is one of the most worrying things for most gardeners, especially for the firs t few years.
I would suggest you have pruned wat to close to the main stems and by doing this, you have removed the whole branch and removed any TINY little red buds that would have been ready to burst into growth,
When pruning in future, try to look for OUTWARD facing buds and use a slanting cat away from the bud, the slant should help any water to run off AWAY from the bud 1/4 inch above the outer facing bud.
The reason for selecting outward facing buds us to try get the bush to look like a Goblet shape, remove all crossing inner branches this allows plenty air to circulate the inside of bush, preventing mould etc, and making it easier to spray if required.

By over pruning it might be that you wont get flowers till later in the season,
Roses are very greedy plants and like a wide root run once they are settled, a rich in HUMUS soil is required also as it helps hold onto moisture, allows air into the soil and gives some nutrients around the roots.
I would be inclined to pot them into much larger pots, as deep as you can find too,
As to fertilising, there are some specific for Roses, powdered mix, you have to go by the dosage and NOT over feed, mix the powder / granules into the soil in the pot and very gently use hand fork to mix it into the soil, water well.

There are several books on pruning, Roses / tree's / shrubs etc, also sections on trouble shooting both bugs and diseases that are a problem for Roses, they are NOT expensive BUT are plane speak and easy to understand. try the local Library or Book store .

For got to mention the pic No 2, there looks to be a little bit of damage at the main stem just above soil level so watch that area as bugs / disease can get into broken bark areas. it also might be very close to the part where Grafting may have been done, NOT too sure IF your Roses have been grafted though so I could be wrong. As Diana has mentioned, you can get sprays for grey mould, I use a very weak mix of vinegar and water, you may have to re-spray a week later just to help keep on top. make sure the Roses have good air flow around them as the grey mould likes still warm conditions, so dont have the pots against a wall etc.
Hope this helps a little and things go back to normal,
Best of luck and kind Regards.
WeeNel.