I can’t be positive, but that can be a response to stress or root damage. So be sure and disinfect your pruning shears to avoid inadvertently spreading this virus. Hi Dr. Helga, We are now thinking it might be an armored insect problem! Also remove dead or damaged flowers and leaves to prevent the fungus from gaining egress into the plant. That can cause leaves to turn purple. : 90308 Rispenhortensie 'Silver Dollar®' Hydrangea pan. Some people recommend natural remedies like garlic oil, liquid kelp, or hydrogen peroxide (diluted), but you would probably be best served by using… Read more », Hello, thanks for the very informative article. I have an educated guess, but I can’t be sure whether this is the culprit or not. Let me know what you think. You can take steps to try and prevent this infection. Don’t water late in the day, and only water at the roots, so you don’t get the flowers and leaves wet. Then the leaves of the plant will start to be distorted and rolled, and the growth of the plant will be stunted. The plants also grow better… Read more », Hi Helga! Two of my hydrangeas are dying. Powdery mildew is caused by several similar fungi that appear as white, powdery spots or widespread coating on leaf surfaces. However, the bacteria is continuing to spread. Die Wuchsgeschwindigkeit richtet sich nach den Sonnenstunden und beträgt zwischen 15 und 50 Zentimetern pro Jahr. I have a problem fungus that I can’t seem to identify or treat properly. However, to be sure that it is Verticillium and not something else,… Read more », A million thanks, Helga! I’m sorry that your macrophyllas have a new affliction. (And keep disinfecting your pruning shears.) There is an organic treatment called neem oil that might help. Die Hydrangea macrophylla „Fireworks“ gilt als winterhart. Our borders grow shrubs vigorously so we tend to plant in pots. These plants are 8 yrs old. Would it be possible to provide any pictures of earlier stages of the disease when the lesions are small? Do you think this is a factor? I suspect that you are right about frost damage. Anmut und Eleganz beschreiben … It sounds like you are doing everything right. Hi Helga- thank you for your expertise. It affects both our oakleaf and mophead hydrangeas, our pawpaws, dogwood, and azaleas. It definitely looks like an infection. I’ve thinned the plants and actually have been using the neem oil on it for a few weeks and it hasn’t helped. Or you could be right about anthracnose. Thanks! The spots darken and become angular in shape. They should be able to help you. Also, most treatments will take longer than two days to start kicking in, so don’t give up yet. Look at the base of the plant and see if there is a canker there. Hi Roger, Thanks for the status report! But the leaves are starting to turn brown. I’m not sure it is the same disease in all the plants, but it acts the same. In addition, infected flower parts can fall on the leaves and infect them. I think there are two separate things going on. Are the leaves folded and stuck together? I have stopped the spread and my the branches / leaves are growing green. Have you fertilized them recently? Ask the people in the garden center for a fungicide with copper, chlorothalonil, or mancozeb. Disinfect your pruning shears with 70% rubbing alcohol or 10% bleach. Unfortunately, their beauty can be sullied by a number of fungal and viral diseases (and two bacterial diseases). Hi Helga, many thanks for getting back to me. I have attached pictures of both. Could you describe the spots? We have had an unusually cool spring with some nights in the 40s. We had weeks of beautiful weather but then some frosty nights. It’s only on the macrophyllas I notice it. What do you think? I’ve had another grower say “they just don’t like being potted” but I’m not sure if it’s another reason. There is a fungus called Cercospora that can cause purple spots, but they usually start as small lesions and don’t take over whole leaves from the tips. When your beautiful hydrangeas develop problems, especially white leaf spots, it's natural to assume that the cause is a fungus. That could be why you had problems with your other trees. Here is more about what we do. It looks like the rain and humid weather unleashed an attack of fungi on them. There are several things that could be going on. Do you have any guidance? Hydrangeas infected with this virus will have a pattern of yellow mosaics on their leaves. That type of browning looks like fertilizer damage to me. If this diagnosis is is correct, what shall I do next? Thanks for asking. I think it’s an insect – the dreaded mealybug. The leaves of the plants were green and flourishing. There are several diseases that it could be. This is happening on a limelight and a strawberry vanilla hydrangea. They were beautiful and green. 1) Fertilizer burn: There are a couple things you should do. That combination makes me think that it might be an insect known as oyster shell scale. The infestation looks severe to me, so I would definitely suggest treating it. You should also prune back the infected parts of the leaves and flowers. This is how my leaves look, so glad to find your site. This year, I have been doing the same about once a week, but now I’m also noticing browning around the edges of leaves. Hi, Helga! I hope this is not causing it to be a water from top approach. Would it be possible to upload a picture of the spots? Honestly, I’m not sure about the leaf curl. Last year, I started noticing the brown spotting. She transitioned to full-time writing in 2009. This fungus can severely affect the flower buds and even kill them before they open. Your poor plants! Sorry~ I couldn’t figure out how to add the photos on my first comment, so they’re coming separately. Janet Waters. Different chemicals are required to kill it. Fortunately, this fungus usually doesn’t kill its hosts. Can you help? There are some commercial products that contain it, but I suspect they have other chemicals to modify the solution. Cercospora manifests as circular purple or brown spots on the bottom of the plant. The symptoms sound like the plant might have Phytophthora root rot – a hideous disease. I think you should prune off the infected leaves to keep the disease from spreading. Was it also a rainy spring? Have you seen any of them on your plant? To prevent splashing rain from spreading the disease, add a layer of mulch around the hydrangea. It’s anthracnose. Hi Victoria, I’m so sorry that your hydrangea is showing signs of disease. Helga George, PhD. You said you used an insecticide. That is awesome that you removed the debris! Thank you for the informative article! My New Hydrangea Flowers Turn Brown in Early Summer, How to Remove Dead Flowers From Tardiva Hydrangeas. The tops of leaves turn brown or yellow and eventually fall off. Hopefully, they can exterminate them! 3) Are there round orange spots on the bottom of the brown leaves?


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