I have a "Mr. Lincoln" a long stem red rose. It has some very irregular growth. I have cut the irregular growth several times. A friend of mine said that it may be Rose Rosetta for which there is no cure. Is there anyway to identify it for sure before I have to dig it up? The white you see on it is a recent dusting of Sevin. Thank you
Frederick County Maryland
We viewed your photos and the light red growth looks like normal new growth. Take a look at our website and view photos of rose rosette to see if this is what you are referring to. http://extension.umd.edu/hgic/rose-rosette-shrub
We do not recommend Sevin as a preventative because it is a broad sprectrum insecticide that kills everything
including beneficial insects. Monitor your plants for potential problems. Identify the pest or disease and use the least toxic control if needed. You may be able to physically remove, etc. or spot treat if needed. Here is a good publication on Common Sense Pest Control. http://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG62%20IPM...
You can send us photos of insects or damage if you see additional symptoms.