If it is mostly just on the buds, it could be a type of aphid. Try swishing a budded branch end in a container with dish soap +water. (disposable tupperware type container is good, as you can see through it.) If they are aphids, they will drop off and remain in the water.
If you think they ARE aphids, you can spray the whole plant with a dish soap/water combo. That should safely help keep it to a minimum. Dawn or lemon dish soap are both good. ( don't spray in full sun, please) If the plants are small yet, feel free to swish ends like above, in a container. You won't kill the buds.
If you think you need more help, Bayer makes a 3-in-1 systemic product for roses that is easy. You mix it in a bucket of water and pour it around the base of the rose bush periodically as per product directions. I have used it with great results.
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