Question
QUESTION: I have 8 rose bush "trees" in different colors and they all now that spring has sprung, have new growth sprouting from the base of the plants, these plants are all 5 foot or taller and have been budding for about 1 month .. My question is " After I cut the runners from the base of these trees,/bushes, is there a way to stop them from from growing from the base? such as Tar or something, or do I keep cutting these new growths?
Thanks in advance!

ANSWER: As you probably know, rose trees are made by starting to grow a Rugosa rose and taking off the side shoots as it grows. When you keep rubbing them off they will in time stop growing at all. However sometimes it doesn't work that way and they start again. Don't cut them off as you will only be pruning them and this will encourage them to grow again. Take your hand and grasp the sucker and yank down. Don't be concerned if it tears because you want to make a wound so the rose will heal it over and shoots won't be able to break through again. You can't put anything on the stem as this would kill the tree itself.

---------- FOLLOW-UP ----------

QUESTION: Thanks for the REALLY FAST reply!!
I had river rocks as ground cover around both, these rose trees as well as the surrounding strip, there are drip irrigators installed for each plants , My follow up question would be " What would be best to surround the base of these roses, each 1 has a shallow box and I removed the rock covering the base, there is weed cloth installed, are rocks best? or would some kind of mulch be better as I live in a very hot summer climate"
Thanks again !

Answer
Here are the pros and cons of rock mulches.
Dirt  can settle in the rocks allowing weeds to grow so you have to keep hosing it down to keep it seeds and dirt out.  
It is best to use plants requiring low moisture or install drip irrigation for the thirstier plants in rock mulch as you have already done
Dark colored rock like lava rock can really "cook" an area and actually rock mulch keeps the soil warmer than normal.
You should keep the rock pulled back from the base of your plants so they don't end up getting choked.
Rock mulch is ideal and the best, in high wind areas.
So not many cons but the one con that isn't good for roses is the warm soil. Roses really love to have cool, damp roots as warm r hot soil just puts them under stress. That is why many times roses in hot climates simply shut down because the roots are too warm and so they go under stress.
So any mulch that is normal such as wood mulches, shredded news paper, compost, shredded leaves will cool down the soil when the heat of the sun starts to bake it. The only problem is that you have to replace it as it breaks down and becomes soil and it also holds water for a longer time. However if your roses are growing well and you have no problems with them, then I would just use your river rocks. Don't change what works for your situation.