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Can someone please help me? My Mabella is dying! She has blackspot ,although it has not been a problem in the past. What worries me is that she has red patches with gray raised patches in them, and when I was doing spring pruning of her dead wood there was a fat, yellow worm in one of the canes. now all of her shoots are shriveling up.
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I'm sorry for your rose problems! Is this rose potted or in the ground? Has it been recently fertilized? Is is own root or a budded plant? Have there been issues with too much or too little water? Where are you located so we can try to determine if high heat or freezes might have contributed to the problems? Might you be able to take clear photographs of the gray/red splotches, the shriveling canes and entire plant to post here to help with the diagnosis?
The borer shouldn't cause all the canes to shrivel, unless it's a budded plant and the borer made it all the way down into the bud union. It's entirely possible the regular black spot each year weakened the plant to the point where something else is killing it. There are just so many possibilities that some answers and good, close-up, clear photos would definitely help to figure out the problems and what to do about them. Good luck! Thanks. Kim
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sorry for the wait. computer has been down and it will not let me upload photos. so unfortunately I cannot upload the photos I have. I live on the border of zones 5 and 6 if that helps. I do not know if it is budded or own root, because it was here when I moved here. all the tag said is that it is from Jackson and Perkins. thanks for the help. it has not recently been fertilized and it is in the ground. al though last year was a very hard year. a lot of bugs and blackspot and very little rain.
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If it's a J&P plant, chances are very good it's budded. It wasn't until rather recently in their history they offered own root plants. I believe their tags for the own root should call them "New Generation Roses", their designation for the own root ones. The plant may be declining because of freeze damage. Very little rain can also come into play and help other pathogens and pests adversely affect it. The borer would only have affected the cane you found it in. Have you been able to find any other borers in the other canes? Are the red patches with raised gray areas on the foliage or canes? How often is it being watered? Is it next to any walls or hard scape where it may be receiving reflected, radiated heat? Has anything changed (construction perhaps) which may have altered the drainage? Might it be receiving less sun than in previous years because of nearby trees growing larger? Might anyone have dumped any cleaners, paint or other chemicals near it which may be seeping into its root zone?
This link is to a site sponsored by the Sacramento Rose Society, with much of the information gathered by our retired State Entomologist. Perhaps if you browsed some of the photos of the various diseases and other issues, something might resemble what's happening to your rose?
http://www.sactorose.org/rosebug/irosepests.htm#DOWNY%20MILDEW
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Thank you for the link. It really helped. The patches are on the canes. In the summer it is watered about once every three days. The plant is right against a brick wall and a couple feet from the concrete driveway. As for the rest that has been consistent in past years. I am very appreciative for your help and she is finally started to recover after the shriveling.
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Marvelous! You're welcome! I'm glad it's appearing to recover and I could help. Good luck!
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