Roses in general can be subject to several disease issues such as black spot, cercospora, powdery mildew, etc. and pest problems like roseslug sawfly damage, aphids, etc. 

In general, it is best to select disease-resistant varieties of roses. There are hundreds of hybrid roses and cultivars available and they vary in their susceptibility to diseases. Weather conditions play a large role in disease severity. Do not use homemade spray recipes as they may cause phytotoxicity damage to the foliage. Make sure you identify the pest or disease before you spray and know what you are dealing with. Here is our page on common problems of roses with photos and management. https://extension.umd.edu/resource/common-problems-roses

Rose in the container - We cannot say what caused the damage. It may be from rose slug, a sawfly and/or black spot, a fungal disease which is common on roses.  There is no foliage on the rose and you need foliage to control a pest or disease issue. At this point, you can let the rose refoliate and monitor for symptoms and control as necessary. You will have to monitor for rose slugs as there may be several generations a year. Black spot causes yellow leaves and  defoliation.  At the least, remove all fallen foliage from around the base of the plant and dispose of. Most people will need to use labeled fungicide sprays every 7-14 days as the first leaves emerge in the spring through the fall for adequate control of this disease. See the above web page for management of rose slug and/or black spot. 

Second photo - is out of focus and we cannot identify what is going on. We cannot tell if the stubs are from pruning, deer damage, etc. If you are dealing with aphids on the flower buds, they have many natural enemies (predators) like ladybugs and lacewings in the environment that can help to control their populations naturally. You can also try to blast them off with a strong stream of water. 

If no aphid predator or parasite life stages are present, and the level of plant damage is objectionable, control may be necessary. A commercial brand of insecticidal soap is the safest insecticide to use. https://extension.umd.edu/resource/aphids-trees-and-shrubs

Third photo - looks like damage from rose slugs. These are insect larvae, not slugs, and are in the group called sawflies. They are easy to miss, small and wormy looking and often can be found beneath the leaves. Look under the leaves and monitor. It is possible the damage may have been done. Some rose slug species have more than one generation per year, so control efforts may need to be made more than once if you see damage continuing.
Here is our web page and how to best control: https://extension.umd.edu/resource/roseslug-sawflies-shrubs

https://extension.umd.edu/resource/common-problems-roses

Hand picking/squishing works and the most environmentally-friendly approach would be to try to blast the leaf undersides with a harsh jet of water from a hose nozzle. Sawfly larvae can't get back onto the plant after being dislodged like this. 

Otherwise, low-impact insecticides like a summer rate of horticultural oil or spinosad (an active ingredient in several products) will help control them while having minimal or no impact on beneficial insects. Spray upper and lower leaf surfaces. Follow label directions about how often repeat treatments can be/need to be made.

Roses in general are not low maintenance plants. You can send us more photos if you notice additional symptoms. Alternatively, you can decide to replace with another type of native shrub.

Marian