Answer: Grubs are a problem with turf grass (feeding on grass roots usually in mid to late summer) but would not be affecting your rose roots. So I suspect something else is happening to the roses. They might have been stressed by oscillating temperatures this past spring. Or, they might have suffered root damage from voles during the winter. Or, they might have suffered accidental herbicide or other chemical damage. Without knowing more of the symptoms it is difficult to guess what the cause would be.
At this point I would suggest top dressing with a good quality compost, trim off any winter damage, keep the soil evenly moist (damp like a wrung out sponge, not sopping wet and not dried out) and see if they come out of it.
In the meantime, you could also consult with your local county extension and see if they have any suggestions as to what is happening to the roses. I am sorry you are having trouble with them.
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