University of Maryland Extension

Rose Rosette - Shrub

rose cane infected with rose rosette

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Rose rosette is becoming very apparent on wild roses along roadsides. This disease abbreviated (RRD), is caused by a virus and infects multiflora as well as ornamental roses. The initial symptoms are reddening of the stems and stunted growth. Sometimes there is a proliferation or clustering of stems with excessive soft pliable thorns. The flowers may also abort. Infected roses may die within two years.

The disease is transmitted by an eriophyid mite and by grafting. Mites can be carried by wind currents from infected roses to healthy plants downwind. Multiflora rose serves as the main source of infection in ornamental plantings.

rose rosette

Management Strategies: Early detection is critical to prevent further disease spread within a planting. Infected roses should be uprooted and removed promptly. Remaining roses should be closely monitored for symptoms. If possible, multiflora roses should be removed from the vicinity. Ornamental plantings should be planted upwind of multiflora roses and spaced so that their foliage will not touch. There are no pesticides for this disease and the control of eriophyid mites is very difficult.

Photo Gallery:

deformed rose buds

infected rose shrub

Deformed buds

Leaves infected with rose rosette

mite that vectors rose rosette

abnormal thorns

 

Eriophyid mite that vectors the disease

Excessive soft pliable thorns

 

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