- Associated Press - Friday, November 6, 2015

BOSSIER CITY, La. (AP) - A devastating disease of roses called rose rosette disease has been confirmed for the first time in Louisiana.

LSU AgCenter horticulturist Allen Owings and the AgCenter’s plant doctor, Raj Singh, says rose rosette was found on landscape shrub roses growing in a commercial landscape in Bossier City. Once infected, Singh says there’s no cure.

The disease produces a variety of symptoms, depending on the rose’s variety or species and the plant’s age. Some more recognizable symptoms include “witch’s broom,” excessive thorniness, thickened new canes and abnormal discoloration or excessive reddening of new foliage.

Owings says naturalized plantings of the wild species of rose called multiflora are serving as host plants around the country for the disease. Singh says the disease is transmitted by a tiny eriophyid mite, or by grafting.


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