There are a number of different organisms that can infect hydrangea plants and sully their beauty. That’s fantastic news! There are no chemical treatments against it at the moment. However, there are steps you can take to keep your beauteous shrubs from falling victim to one of these diseases. I just got fresh water hooked up to my main water this season because I hate having a constant fertilizer for my plants. It sounds like you are doing everything right. . However, more severe infestations can cause both wilting and root rot. They should be able to help you. A highly contiguous fungal disease, powdery mildew affects many different species of plants, including hydrangeas. / 05 April 2019. Cercospora Leaf Spot typically appears in late summer and fall. Hi D’Lyn, I hope this is not causing it to be a water from top approach. I think I read Hydrogen Peroxide could help for Anthracnose. Common pests and disease. Fungal disease in moist conditions, especially those that take place during warm weather will cause leaf spots. One possibility is that they are getting sunburned. If you would like me to, I can delete your previous message. From what I understand, there isn’t much you can do but prune back the dead limbs. This won't take off the spots already there, but it will prevent any more from forming. Leaf spots are dark reddish-purple and may have angular edges, where they are bordered by leaf veins (Photo 1). Anthracnose occurs sporadically in the landscape and only effects bigleaf hydrangea (Hydrangea macrophylla), what some folks call "mophead" or "French" hydrangea. Don’t compost them or leave any on the ground. I am aware of the “rust” blight that hydrangeas sometimes have but I thought that was specifically a leaf issue. I would also prune off all of the infected leaves. Always obtain independent, professional advice for your own particular situation. Two days later I started noticing some browning on some of the leaves. The spots are small that typically measure 1/8 to 1/4 inches in diameter. It’s not responding to any of the fungicides I try, I can’t seem to get them to upload, or delete the comments that uploaded without the pics. It affects both our oakleaf and mophead hydrangeas, our pawpaws, dogwood, and azaleas. Is there a chance that you could post a picture? Here are Amanda’s photos of her hydrangeas: Your poor plants! Fungal Leaf Spots. However, these grow into reddish brown lesions. If the roots look brittle and mushy,… Read more ». The one that is all sticks was the one that was iffy last year and they have not bloomed in 2 years. Based on your post I am thinking maybe bacterial? It can spread throughout the plants and cause them to die back. In addition to the usual white, powdery fungal growth on the leaf surfaces, yellow or purple leaf blotches might be present. You should disinfect your pruning shears in 70% rubbing alcohol or 10% bleach. Another thing to do is pick up all the leaves and debris from under the plants and dispose of them away from your garden. I have already experienced one diseased plant from them that I… Read more », Dear Shannon, I’m so sorry that your hydrangeas came with problems! The leaves are always green and healthy – it’s just the blooms during the 2nd bloom period that are a light brownish color. Pretty much the same result. I put my hose at the base of each plant and let it trickle on the root ball for about 30 minutes. Get 10% off at Thompson & Morgan and save on seasonal specials. That starts with a gray film over the flowers. I really am delighted that your hydrangeas are coming back. It’s anthracnose. Powdery mildew first appears as small white spots on the upper part of the leaves. Water your plants at the bottom, so the tops will not get wet. I haven’t read about neem oil being used to treat anthracnose on hydrangeas, but it can be a great fungicide. The first symptoms are water-soaked spots on the flowers. Dear Ruth, I’m glad that you are bringing a company in. My hydrangea has some illness that I cannot identify. Watering without getting the leaves wet will help to prevent these diseases. Elephant ears are often grown for their huge, robust foliage. Hi Rosemary, I’m so sorry to hear that. I can’t be positive from the pictures. That type of browning looks like fertilizer damage to me. I just pruned more leaves and feel defeated. The amount to use depends on the percentage of hydrogen peroxide you are using. I don’t like to use the toxic fungicides so switched to a copper one. Those fungi are really widespread, and the weather must have been perfect for them to infect. How about the leaf curl? Hydrangeas infected with this virus will have a pattern of yellow mosaics on their leaves. When the weather conditions are favorable, these areas enlarge until they cover the entire leaf surface. You should also prune back the infected parts of the leaves and flowers. So be sure and disinfect your pruning shears to avoid inadvertently spreading this virus. There are several things you can do if it is anthracnose. Do you have any idea what this could be? Our yard stays quite dry due to a combination of the heat, a… Read more », Dear Harriet, I’m so sorry that your plants are under siege! The product just arrived and I used it Saturday. I’m not an expert on azaleas, but my guess would be that it is Cercospora leaf blight (caused by a fungus, too). That disease also spreads to the leaves, and it looks like that is the case from your photos. Any ideas? I’m not sure it is the same disease in all the plants, but it acts the same. But the leaves are starting to turn brown. Thanks for the great website. There is another article on the site about Phytophthora on fruit trees, but it might give some useful background: How to Identify, Prevent, and Treat Collar and Crown Rot in Fruit Trees. Let us know if that helps! Thank you so much! This is mysterious. If possible, plant them where the direct sun will be in the morning, or late afternoon and evening. If you rub against the spots, do your hands turn rust colored? This disease doesn’t usually harm the plant but is aesthetically problematic for some gardeners. I do not see any insects or borers or fungus on them… Sevin dust didn’t help. I’m currently using Natria Disease Control. Hi Kay, I’m sorry to hear that! I have fertilized it couple of weeks ago. If your hydrangeas are planted in the ground, there isn’t much you can do to stop this from happening. Was it also a rainy spring? Helga George, PhD. Phyllis P. Hi Phyllis, I’m so sorry that your hydrangeas are suffering. That sounds awful. For cultural control of all three of these fungal leaf diseases, remove and dispose of fallen leaves. There are two types of fungal diseases can infect hydrangeas - cercospora leaf spot and anthracnose. I treated with an organic anti-fungal spray that seemed to help, but I noticed I had to use it more often than the every two weeks recommended on the bottle. Those leaves will remain spotted until they fall off in the winter, whether or not you spray. I ordered Bonide’s “Infuse”, which is a systemic fungicide… I’ll hit using both types, contact and systemic… hopefully that will get the situation under control. Cercospora leaf spot is an infectious leaf disease that affects smooth, panicle, oakleaf and bigleaf types of hydrangea in Arkansas landscapes and nurseries. Hi Tina! I can’t be positive, but that can be a response to stress or root damage. It could be stressful for the plant to be inside, since the humidity in houses is typically low, and light is limited. We also have a ruby red slippers hydrangea and that one is blooming fine with no problems or spots. I’ve had another grower say “they just don’t like being potted” but I’m not sure if it’s another reason. We occasionally link to goods offered by vendors to help the reader find relevant products. Thank you so much for all the information! Thank you. Simple Steps to (Once-Again) Stunning Blooms — How to Solve Common Hydrangea Problems . I have ordered up some Flairform Pythoff to enable me to treat all shrubs nearby. Some biofungicides (living organisms that kill fungi) have been used against… Read more », I have four endless summer hydrangeas planted in front of my shed. I can’t be positive, but it looks like Botrytis blight to me. Hydrangeas like cool temperatures (50-60) and ideally should go back outside when the weather improves. Please do keep us posted! I am worried that it would be too late to save it. It might not be anything that you did wrong. It is still small and today I went in the backyard where it is and noticed spots on many of the leaves as well as several leaves having large sections missing. I do not want to stress the plants. Fertilized on March 31. It sounds like you want to use a natural treatment. Three weeks ago, I transplanted a few hydrangea paniculata pillow talk. Is it worse on the undersides of the leaves by chance? It starts out with lesions that are angular shaped and dark brown to purple, and it also starts from the bottom of the plant. Prune away heavily affected areas and spotted leaves to prevent the fungus from spreading. 3. I have some doubts about using hydrogen peroxide to treat anthracnose. Help. They spots appear to have a hint of red and they start from the leaf tips. Spots are normal on some hydrangea stems, but if they are new, that is definitely bad. These three are the most common viral infections that you are likely to encounter: If your hydrangea has brown spots or rings on its leaves, there is a good chance that it is infected with hydrangea ringspot virus. . I’m hoping it has just been over fertilized. Fungicides are available to control it, including paraffinic oil, axozystrobin (Syngenta Mural Fungicide Azoxystrobin Benzovindiflupyr, and thiophanate-methyl, Cleary’s 3336 Turf & Ornamental Fungicide Southern Ag Thiomyl Systemic Fungicide). Is there a chance that you could post a picture of the flowers? I am wondering if the cause could be a deficiency of phosphorus. With early detection, most of these maladies can be eliminated. There are no spots. I will look for something different and perhaps stronger. Avoid planting it in hot, dry, exposed sites. Thought maybe it was due to a very cold night close to freezing. It looks like an insect infestation to me, so that makes sense that the fungicide didn’t help. And disinfect your pruning shears with 70% alcohol afterwards. I’m not positive, but I suspect it might be due to Hydrangea Chlorotic Mottle Virus. Hi Ann, Thank you for providing that information! Also, most treatments will take longer than two days to start kicking in, so don’t give up yet. The fungus lives in the soil for many years, and there is no way to get rid of it. Tomato Ringspot Virus. Be sure and disinfect your pruning shears periodically in 70% rubbing alcohol or diluted 10% bleach… Read more ». Transmission can occur by knives, leaf contact, and insects like aphids. It looks to me like it might be the deformed growth that you can get from anthracnose on your hydrangeas. Hi Angela! There are no grey mildew and there are no circular lesions on the leaves. Please help. GARDENER'S PATH® IS A REGISTERED TRADEMARK OF ASK THE EXPERTS LLC. They were doing great with abundant nice green leaves and lots of flowers. Fortunately, this fungus usually doesn’t kill its hosts. Here is a page from the Missouri Botanical Garden that shows the structures on various trees. I am in the UK, it’s been unseasonably sunny and dry so far this year, but this fungus has appeared – I’m worried it’s honey fungus but no mushrooms are apparent. Or do you think its too soon. These spots become larger lesions and can kill the leaves. I live in Michigan, which has very cold winter. Newly hatched scales (crawlers) are less than 1mm long and are pale yellow. Spotting generally begins at the base of the plant on older leaves and works its’ way up the plant. Fertilizer burn is an excellent suggestion, but the symptoms from that usually develop on the edges of the leaves. How often to use? This is mysterious. The are maybe half of the leaves not fully developing. Now I noticed the blooms are starting to die from the inside out. Keep the humidity low. That is awesome that you removed the debris! Does that fit the symptoms? Hydrangeas are susceptible to honey fungus, so replace them with more resistant shrubs. The white flaky stuff is on the ground under the bush, too. Let us know when your hydrangeas have been cured. Nematodes, not pruning tools, spread this virus. Leaf spots caused by a variety of fungi can occur on hydrangea. Hi Summer, I’m so sorry about your hydrangea! Hello, I’m having serious problems with two plants I bought last summer for large containers. If they are in pots, I would suggest moving them to a less sunny spot, but that’s not feasible if they are in the ground. Fertilizing hydrangeas can cause the leaves to brown on hydrangeas. Also, drafts from a heater can cause problems, too. Early signs of this disease are small circular white spots with feathery edges scattered on the lower surface of the leaves. As the name suggests, hydrangea ringspot virus (HRSV) causes round or ring-shaped spots to appear on the leaves of infected plants. 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