Camellias may be brought into the office with white streaked blooms or streaked mottled leaves. You may be looking at Ring Spot virus. As with other viruses, there is no control other than pruning out and sanitation. I have had a number of calls from agents about plants falling over and having no root system left. As if by a curse, I noticed three rose bushes in my yard had fallen over with nothing but knubs left for roots.
Voles are the culprit in all cases.
Zinc phosphide, a restricted use chemical, is the only product listed in the Georgia Chemical Control Handbook. TIPS Prune roses now. Remove weak and damaged canes. Use sharp by-pass hand pruners and make the cuts a fraction above a bud making the cut on a slight angle. Don't fertilize shrubs until the last part of March.