Problem Identifier Unit Screen//v.w/ RR Template

Problem Identifier Unit Screen//v.w/ RR Template Mosaic and Streak Viruses

Problem
Yellow or brown rings, or yellow splotches of various sizes, appear on the leaves. The uninfected portions remain dark green. New leaves may be puckered and curling; flower buds may be malformed. Sometimes there are brown rings on the canes. The plants are usually stunted.

Analysis
A number of viruses infect roses. The viruses are transmitted when an infected plant is grafted or budded to a healthy one. This generally occurs in the nursery where the plant was grown. Some plants may show symptoms in only a few leaves. However, the virus is throughout the plant, and further symptoms may appear later. Most rose viruses are fairly harmless unless there is extensive yellowing or browning. The virus suppresses the development of the green pigment (chlorophyll), causing the splotches or rings. Food production is reduced, which may result in stunted plant growth.

Solution
No cure is available for virus-infected plants. There is little natural spread of rose viruses; therefore, only weak plants need to be removed. When purchasing rosebushes, buy only healthy plants from a reputable dealer. (For further information on selecting healthy plants, see Choosing Plants.)

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