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Secure the netting so there is no place for the birds to enter . The fence must be high enough so the rabbits cannot get over the top when the snow is deep . Loosen soil around the roots with a garden fork , and tip each rose into its trench . Within two weeks , a rust-colored pustule containing spores develops in the center of each spot on the lower leaf surface . It truly has no place in the home landscape . Finish by covering with chicken wire to hold everything in place . It was thought that the overwintering structures of this fungus were not cold hardy , but they have now been shown to survive winters when under cover of snow and / or mulch . Other non-diseased plants that do not have deformed or blemished foliage can be left in place for winter interest . You may mix in up to one-third by volume compost , peat moss , or other organic matter . A short time later , rust-colored concentric rings may begin forming around the initial pustule ( illustration ) . During feeding , plant sap containing the phytoplasma is sucked into the leafhopper 's body where multiplication of the microorganism takes place . Then dig a trench out from the base of each plant . Birds often find these flowers in the snow and it 's fun to watch them harvest seeds from the flower heads .