Again, the virus does not appear to be able to spread by pruners that have been used to prune an infected bush and not cleaned before pruning another bush. First detected in the knockout roses in 2009 in Kentucky, the disease has continued to spread in this line of rose bushes.ĭue to the huge popularity of the knockout roses and the resulting mass production of them, the disease may well have found its weak link to spreading within them, as the disease is readily spread through the grafting process. Unfortunately, even the knockout rose bushes have proven to be susceptible to the nasty Rose Rosette disease. The highly disease resistant knockout roses seemed to be an answer for disease problems with roses. I won’t go further into this here, but look up Emaravirus online for a further and interesting study. The virus has recently been placed into a group known as Emaravirus, the genus created to accommodate a virus with four ssRNA, negative-sense RNA components. Since then it has been a case for many studies at plant disease diagnostic labs. Research indicates that the virus was first discovered in wild roses growing in the mountains of Wyoming and California in 1930. The virus does not appear to be spread by way of dirty pruners either, but only by the tiny mites. Miticides used against the spider mite do not appear to be effective against this tiny wooly mite. They are not like the spider mite most of us are familiar with, as they are far smaller. The mite is named Phyllocoptes fructiphilus and the type of mite is called an eriophyid mite (wooly mite). The virus is believed to be spread by tiny mites that can carry the nasty disease from bush to bush, infecting many bushes and covering much territory. The difference is that the virus infected foliage keeps its color and can also become mottled, along with vigorous unusual growth. ** Note: Deep red colored leaves may be totally normal, as the new growth on many rose bushes starts out with a deep red coloration and then turns to green.
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