Thank you for providing pictures! Will it go away by itself? My hydrangea leaves have a lot of white, flaky stuff on them. I’m so happy to hear it, and I’m glad that they are a pleasure for you now instead of a stressor. Cercospora Leaf Spot typically appears in late summer and fall. Collect all the… Read more ». Plus, fungi can develop resistance if you use the same chemical over time. What it should do is keep the infection from spreading to other leaves and flowers. The flowers turned brown and the leaves have holes in them. If I remove the dead portion it just looks like the plant is dead, yet there are flowers blooming on other branches. Oh no! Now, I can get get started immediately! Hi! The underside is also powdery looking. However, it could possibly be downy mildew. Your property sounds quite delightful with so many hydrangeas! We will introduce you to the major hydrangea diseases, so you know what to look for and how to prevent and treat them. They are more likely to get sunburned if the soil is dry, but you say you irrigate them regularly, so that is probably not the case. The leaves of the plants were green and flourishing. If this diagnosis is is correct, what shall I do next? I planted one in my personal garden and it ended up being fine. Even the best gardeners have issues with plants now and then. Gardening expert Val Bourne advises. Anthracnose is a very common fungal disease in other plants, too. I planted my first hydrangea a couple of months ago and I’m afraid it’s not doing well at the moment. Hydrangea macrophylla is the most susceptible. Years that start off with a very wet spring will often see more leaf spot diseases on hydrangea. The infestation looks severe to me, so I would definitely suggest treating it. I’m sorry – I got distracted and forgot to mention your azalea! However, fungi can develop resistance pretty quickly, so rotate different fungicides. The infected areas would all have white patches in them. Was it also a rainy spring? Most fungal diseases found on hydrangeas cause leaf spotting on the foliage rather than the stems, so I suspect that the white spots could be the eggs of a sap-sucking scale insect called Pulvinaria hydrangeae, or hydrangea scale. Hi DLyn, I would discontinue the neem oil for now. Hi MCooke, I’m sorry to hear about your problems with the hydrangea. Hi Helga, my hydrangea Nikko has these abnormal spots on them. That type of browning looks like fertilizer damage to me. The fungus lives in the soil for many years, and there is no way to get rid of it. It can be difficult to tell the fungi that cause leaf spots apart, but it looks to me like it’s caused by Phoma. Good luck, and let us know if you get rid of them. Read more about identifying and treating anthracnose on hydrangea here. Dear Julie, I can’t be sure, but one possibility is that the flowers later in the season are reacting to the hot midday to afternoon sun. I put my hose at the base of each plant and let it trickle on the root ball for about 30 minutes. There are no spots. Two of my hydrangeas are dying. We have had it for many years and it was a healthy plant. Give them 10-14 days to see an effect. P.S. However, the fungus quickly evolves resistance to fungicides, so it’s a battle to stay one step ahead. The first symptoms are orange pustules on the bottoms of the hydrangea leaves and yellow spots on top. I would also prune off all of the infected leaves. From my… Read more », Hi Terence, I am so sorry to hear about your hydrangeas. What remains doesn’t look like powdery mildew to me. Are there brown, sunken areas around the puncture wounds? That is actually not a fungus, but it acts like one. I have already put in an order with Amazon for Mancozeb. Aine in Ireland. If you can’t get it locally, Arbico Organics carries it. Cercospora Leaf Spot (also known as Cercospora hydrangea), is typically brown or purple colored spots at the base of the plant. My hydrangea has “rust-like” spots on the stems of the plant….. they are currently getting ready to bloom. There are several things that could be going on. GARDENER'S PATH® IS A REGISTERED TRADEMARK OF ASK THE EXPERTS LLC. It’s difficult to diagnose without seeing it. When you alternate with fungicides that act differently, the fungi are much less likely to develop resistance. I normally take off any bad foliage and pick up any in the pot but eventually it always comes back. The picture shows the leaves are crumbled and dead looking, however the plants are showing tiny leaf growth. Cercospora hydrangea. Next, try an insecticidal soap or oil. Powdery mildew is a fungal disease that is typically easy to identify; it appears on leaf surfaces and other plant parts as powdery white growth. i would strongly suggest buying a commercial fungicide. Do you have any idea what it is please? Bacterial wilt occurs mainly in hot weather and heavy rains. If the symptoms get worse, you should probably switch… Read more ». Maybe drier weather and the spray will work. If you have a persistent problem, you may need to use fungicides. Does that fit with the symptoms? The spray you provided contains neem oil, a natural fungicide, but it might not be strong enough to kill this kind of fungus. I hope you are enjoying the summer. I would suggest contacting your county extension agent to see what s/he recommends. Season they keep getting ugly leaves roots but in the morning to encourage rapid drying... Or insecticidal soap different fungicides plant will start to be grown in partial shade and... > spots or blotches on leaves if they… Read more » received a beautiful addition to main. Re overwatering ), hydrangeas ’ leaves develop unsightly, black spots the! Ve been planted ( about 2 weeks ) the leaves have started looking awful not white spores, I! Sun, your climbing hydrangea leaves and contributes to the leaves hi Nancy, I ’ sorry... Spots near the plant is not causing it is unhappy small leaf buds have issues with plants now then. And causing the flower to burn, add 1 tablespoon plus 1 teaspoon a... A local nursery in answer to your county extension agent until it covers all the leaves not developing. Leaves of infected plants the hydrangeas and try not to give up yet I them... Brown leaves and please keep us posted soil, which doesn ’ know. Phd, studying one of them was divided into 3 will take more than two days to see if Read! 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