If you can, keep good airflow around your plants. But as the spots continue to slowly enlarge, mostly maintaining a circular shape, they become more obvious. Seems to have flushed away the fertilizer from the roots. That is actually not a fungus, but it acts like one. I bought two pots of endless summer hydrangeas last year from Lowe’s. Many different fungicides would work against this pathogen. Phyllis P. Hi Phyllis, I’m so sorry that your hydrangeas are suffering. Hydrangeas can be prone to a fungal disease that causes spots all over the leaves. GARDENER'S PATH® IS A REGISTERED TRADEMARK OF ASK THE EXPERTS LLC. You should also get rid of any fallen leaves. 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. Hi Aine, Your poor plant! Fascinated by the childhood discovery that plants make chemicals to defend themselves, Helga embarked on further academic study and obtained two degrees, studying plant diseases as a plant pathology major. However, a cool rainy spring would definitely be a problem. Thank you! I have hydrangea that I planted this spring forever bloom I think well the one planted on the east/south end of the house are really looking bad the leaves are stunted looking and have brown spots with white specks in center of the brown spots also it seems to be a small hole develop in the brown spots then the end of the leaves are browning and curling what have I done It looks like an insect infestation to me, so that makes sense that the fungicide didn’t help. Spot. Options include mancozeb, iprodione, or thiophanate-methyl. If you rub against the spots, do your hands turn rust colored? I do think it could be cercospora leaf spot because the circular spots on the veins do look purple. Pick up any spotty leaves that have fallen and throw them out with the trash. Hi, I live in south of UK with a small garden. Thank you for providing pictures. The other is to put mulch down. Is that correct? Round terminal flowers can be white, pink, blue, or purple depending on the specimen. My hydrangea leaves are getting folded and looks different in colour. Anthracnose is a very common fungal disease in other plants, too. There is a fungus called Nectria that causes cankers on trees and shrubs. I get them with the leaves curled and crunchy, some varieties more then others. Predictably, leaf spot fungus covers climbing hydrangea leaves and flowers with ugly brown or gray spots. You are right – hydrangeas do like partial shade, and your spot inside sounds like a good one for it. Those fungi are really widespread, and the weather must have been perfect for them to infect. I will attach some pictures. Also, the stems look like they have bumps on them. When it’s unusually rainy (or if you’re overwatering), hydrangeas’ leaves develop unsightly, black spots. I’m not an expert on azaleas, but my guess would be that it is Cercospora leaf blight (caused by a fungus, too). Also look… Read more ». Cercospora Leaf Spot typically appears in late summer and fall. Honestly, I’m not sure about the cause of the… Read more ». They survived the winter with no obvious problems but over the last few weeks have started going brown at the leaf edge and the new buds. I’m used to seeing and treating many of the listed diseases or just letting the hydrangeas be hydrangeas in the fall with the brown spot. Had to heavily prune the other day. I have pruned yesterday the most affected leaves and branches. The one that is all sticks was the one that was iffy last year and they have not bloomed in 2 years. Also, drafts from a heater can cause problems, too. Does that fit with the symptoms? You should pick up any leaves and vegetation under the plant and get rid of it away from your garden, so it won’t spread spores. Collect all the… Read more ». Lots of plants blooming, so I am enjoying the summer! I’m not quite sure what is wrong. Newly hatched scales (crawlers) are less than 1mm long and are pale yellow. It can be difficult to tell the fungi that cause leaf spots apart, but it looks to me like it’s caused by Phoma. There are some commercial products that contain it, but I suspect they have other chemicals to modify the solution. If it’s Botrytis blight, that would also attack the flowers, which would be covered in a grey mildew. They most commonly suffer from powdery mildew, aphids, spider mites, yellow leaves and leaf spots. Brown spots appear, grow in size and spread over the plant. Could you describe the spots? i would strongly suggest buying a commercial fungicide. If summer rains make the problem worse, try a fungicide such as Immunox (always follow label directions). Feed with a balanced slow-release fertiliser, such as Vitax Q4, and see if they grow away healthily. Unfortunately, it’s difficult to diagnose from a picture because several pathogens produce spots that look similar. 2. 3. All normally come with the leaves like that. However, to be sure that it is Verticillium and not something else,… Read more », A million thanks, Helga! Hello Helga! This virus causes the leaves to turn yellow and become distorted, and the growth of the plant will be stunted. Was it also a rainy spring? There are no spots. Do you have any idea what this could be? This is the same bush where I found the caterpillars a few days ago. Also, I would cut off the diseased foliage, so the infection doesn’t spread. That will help the roots by keeping them cool and maintaining moisture in the soil. Hi Dr. Helga, We are now thinking it might be an armored insect problem! Feed: Miracle-Gro. 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. Thank you for posting pictures. The stems got leggy last spring/summer just before the leaves became discolored. Will see how they look after first week of neem oil treatment. Thanks Helga! If you know that rust is likely to be a problem, you can grow the cultivar ‘Frosty,’ which is resistant to this disease. There are two types of fungal diseases can infect hydrangeas - cercospora leaf spot and anthracnose. Treat your pruning shears with bleach as you prune, so you don’t accidentally spread any disease. Various fungal spots may develop on hydrangea leaves. Leaf spots on a hydrangea are caused by the fungal infection cercospora. Thank you for the pretty picture! I also realized this a.m. that in addition to the leaves browning and dying around the edges,… Read more ». I can’t find a lot of pictures of the symptoms, but here is a photo from the University of Minnesota Extension – it’s number 3 here. Last year I sprayed a broad spectrum insecticide/fungicide/miticide: Monterey Lawn and Garden Fruit Tree Spray Plus. Thanks for the great website. My hydrangea leaves have a lot of white, flaky stuff on them. © Ask the Experts, LLC. (And keep disinfecting your pruning shears.) The symptoms look like those of a fungal pathogen, so I think you are on the right track to spray with a fungicide. You can read more about growing azaleas in this article, and feel free to post any additional questions you may have there. Small, gray to white patches appear on the leaves. Hydrangea > Leaves > Spots or blotches on leaves. I have a problem fungus that I can’t seem to identify or treat properly. Thanks so much in advance for your help! I thought hydrangeas loved partial shade so I kept my plants indoor but near a south-facing window. Hi Kay, I’m sorry to hear that! Don’t compost them or leave any on the ground. The symptoms sound like the plant might have Phytophthora root rot – a hideous disease. It looks to me like it might be the deformed growth that you can get from anthracnose on your hydrangeas. That can often cause some of the upper branches to die. While the leaves on my other Oakleaf are getting large and full, the leaves on this hydrangea have stopped growing. The undersides of the plant might have Botrytis blight be, though prune away heavily affected areas and leaves. A million thanks, Jorge, hi Veronica, I ’ m quite! Look as they are bordered by leaf veins ( photo 1 ) fertilizer burn: there several! Problematic for some gardeners new affliction indoor but near a south-facing window cause spots on the leaves kills plants! Will I make a mistake to bring it into my home ( see images ) for planting, dig large! Have also turned whitish in spots them bounce back up around 50-80 degrees, a. 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