Normal new growth |
Red on new stem growth of a rose is not a bad thing. It's one way the rose protects its new, young, and tender growth from becoming sunburnt. It's a rose's sunscreen, so to speak. So don't panic if you see red stems and leaves. But if the growth is abnormally small, numerous, and usually red or even black - what is known as 'witches broom' - then you need to take a good, hard look at that rose. Or ask a knowledgeable rosarian to look at it.
What causes witches broom in different plants varies. It can be fungi, bacteria, viruses, or mites. Sometimes, a witches broom can be used as a dwarf cultivar, or desired by bonsai propagators. But not in roses! In roses, it is usually a symptom of a deadly, spreading disease called Rose Rosette Disease, or RRD.
Normal new growth |
RRD is spread by a tiny (microscopic) mite. These mites travel by gusts of wind. When they land on a rose, they burrow down into the rose and the rose will show signs of the infestation.
RRD is usually deadly to the rose. Unfortunately, while an affected rose lives, it is a host to the mites, which continue to spread to other roses by the wind. It won't just go away on its own. There is no cure. If you have a rose with RRD, you need to remove the rose.
Normal new growth |
Now, don't panic! You don't want to get rid of roses without cause! All the pictures shown here are of new, normal, red growth on the roses in my garden. These pictures are not of RRD! (Thankfully, I didn't have any pictures of infected roses to show you!)
Also, herbicides may cause damage that mimics RRD. Overspray from Round Up is notorious for causing abnormal growth in roses. Because of this, I have learned to never, ever, use Round Up near my roses. Be aware of any herbicides sprayed around your roses.
Ann Peck, of www.rosegeek.com, has written an extensive e-book on RRD. Please click HERE to look at it. She has lots of information, including pictures, and other symptoms of RRD. I believe this is the best source of RRD information you can find anywhere. Ann, we are grateful for your work.
Normal new growth |
My intention is certainly not to dissuade you from growing roses. I love my roses and take delight in looking at them daily. But I am also aware. And if any of them should ever show symptoms of RRD, I would take action immediately.
I hope this horror never comes to my garden. I hope this horror never comes to your garden. But I do hope you are informed.