Rose Rosette- A recent surge in Knock Out Roses

Rose Rosette- A recent surge in Knock Out Roses

Rose Rosette is a fungal disease that affects roses. Rose rosette is currently found in almost all parts of our country. As a professional in the field for more than 20 years, identifying rose rosette disease (RRD) has become easier, but is still easily overlooked by the untrained eye. Most recently, RRD has been spotted on Knock Out Roses. Action must be taken now in order to prevent the spread of RRD to all of the susceptible roses in our area. In the past, RRD was thought to only threaten the native multiflora roses (Rosa multifora) that grow in the United States. It was expected to kill off the native Rosa multiflora, but this didn’t happen. Rosa multiflora still thrives on fencerows and tree lines in our area. In recent years, researchers and horticulturalists are noticing the susceptibility of the Knock Out Rose to Rose rosette disease. Now these native roses are considered to be hosts or carriers of RRD. Rose rosette disease is spread in three ways and is a lethal disease for roses. RRD is spread by wind gusts, root to root spread, or a mite that carries the disease. Wind gusts easily carry RRD and spread it from plant to plant. There is also a mite that eats the foliage of the roses, travels to other roses, and spreads the disease through contact by doing so. Once the rose contracts the disease, there is nothing that can be done to save it, but there are some things that should be done to prevent the spread. Upon identification, the roses should be completely removed from the sight,...