Answer: I have questions regarding whether the Dwarf Holly will survive in containers outdoors in your area. Containers are exposed on all sides to freezing wind and snow, and the plants within are subject to freeze/thaw cycles. It takes a very, very, very hardy shrub or plant to survive outdoors in a container. It sounds like one of the hollies is already showing signs of temperature stress, I do not believe there is a fungus, disease or other pest at work on your holly, I believe they are trying to tell you they aren't going to be able to survive the winter. You may want to consider planting the hollies in the ground before it freezes, or, if size is not a prohibitive factor, move the containers to a sheltered spot for the winter.
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