I do not see any insects or borers or fungus on them… Sevin dust didn’t help. Also, drafts from a heater can cause problems, too. It’s been cool here and just a storm the past couple weeks don’t seem to be conducive to most diseases I deal with during… Read more », Dear Gary, Wow! I have an educated guess, but I can’t be sure whether this is the culprit or not. However, this fungus usually produces colored fruiting structures on the infected branches. A few things you can do immediately are to prune out the dead and damaged areas and get rid of them out of your garden. It could be stressful for the plant to be inside, since the humidity in houses is typically low, and light is limited. Hi Kay, I’m sorry to hear that! You should definitely remove the diseased tissues. We have a company coming to treat around the plant and hopefully save it! We have 4 hydrangeas that have done well for 10+ years. In addition to the usual white, powdery fungal growth on the leaf surfaces, yellow or purple leaf blotches might be present. Honestly, I’m not sure about the leaf curl. A common leaf spot disease in the northeast is caused by the fungus Cercospora. This disease causes unsightly spots on hydrangea leaves and contributes to the defoliation of plants. Plus, using the same one repeatedly can cause resistance. Hi Helga- thank you for your expertise. Prevention is the key in these cases. If the severe trim doesn’t work, you will have to bin them. I have already put in an order with Amazon for Mancozeb. Please help. Just spray your hydrangea's foliage according to label directions with a fungicide such as liquid copper, Serenade Disease Control, Daconil, or Immunox. They are also a very dark green and powdery looking. 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. Next, try an insecticidal soap or oil. You should start by cutting out the diseased sections and disinfecting your pruning shears as you go (70% alcohol or bleach). The individual spots are larger on oakleaf hydrangea than on other types of hydrangea. That sounds awful. How to Treat White Mold This fungal disease can be quite difficult to treat, as symptoms of white … 3. The most common symptom you will see on your hydrangea is a leaf spot disease, commonly referred to as foliar symptoms. Newly hatched scales (crawlers) are less than 1mm long and are pale yellow. Hi Helga! Hydrogen peroxide is pretty unstable over time, and you will want something that will keep providing protection against the fungi. It would probably be fine, but I’m all for an abundance of caution in situations like these. J. of Phytopathology – Corynespora, Cercospora, Cercospora Leaf Spot. Resource used: https://bit.ly/2LhKcZl Hydrangeas can be prone to a fungal disease that causes spots all over the leaves. By the time most people notice the disease in late summer or fall, it’s too late to spray a fungicide for the season. Hi Angela! I have a couple of shirobana gaku ajisai that are being hit really hard with what looks like Anthracnose and some kind of leaf curl. Attached are photos of Oak Leaf and Lace cap, described in earlier post. Plant 1: Pink flowers Unfortunately, that looks to me like it has anthracnose. That could indicate that a secondary infection has developed because your tree is weakened. My hydrangea has something going on and it is not good! If that doesn’t work, I would move onto a more aggressive insecticide, such as pyrethroids. If it’s Botrytis blight, that would also attack the flowers, which would be covered in a grey mildew. Please do keep us posted! Powdery mildew and black spot occur in shady locations when the hydrangea gets poor air circulation. There are no grey mildew and there are no circular lesions on the leaves. I even have a few blooms too. Prune out the diseased parts and destroy them.… Read more ». That could by Botrytis, a fungus that attacks both the flowers and leaves. my father in law brought me hydrangeas for my front porch and all the sudden one of them isn’t doing well. Thanks so much, Hello, I wonder if you can help me with my hydrangea. Years that start off with a very wet spring will often see more leaf spot diseases on hydrangea. 3. Could you possibly post pictures? Hi D’Lyn, One of Helga George’s greatest childhood joys was reading about rare and greenhouse plants that would not grow in Delaware. It looks like anthracnose to me. Thank you so much for letting us know and posting pictures of the new growth! Also, I would cut off the diseased foliage, so the infection doesn’t spread. One distinctive symptom is that spots by the veins develop at an angle. 2) Anthracnose: You should pick up any plant debris like leaves that is on the soil and dispose of… Read more », Hi Helga, Thank you so much for saving my Hydrangea it started to bloom now . Unlike the previous two diseases, powdery mildew likes both cool and warm, humid weather. Zone 6b Pennsylvania. Hi Japjeet, I’m sorry to hear that. I think it’s an insect – the dreaded mealybug. Your local hardware store or… Read more », Hi Helga… I applied mancozed per instructions but I haven’t been able to control the disease. A few of the leaves have also turned whitish in spots. You should also prune back the infected parts of the leaves and flowers. Some of them can be reddish in color. Thanks. Going to order other fungicide you suggested and have it standing by. Xanthomonas campestris. Thank you for posting a picture! Cercospora hydrangea. That can cause leaves to turn purple. Hi, I live in south of UK with a small garden. The fungi are entrenched in the leaves, and it will take more than two days to see results. Fungicides are appropriate to treat that disease also, and I think you could use the same one that you use on your hydrangea. I can’t be positive, but it looks like Botrytis blight to me. Daconil can work on a number of different types of fungi, and its active ingredient is chlorothalonil. However, that usually manifests as spots in the middle of the leaves rather than causing dead tissue around the edges of the leaves. Always avoid watering from above: this spreads fungal spores. If this diagnosis is is correct, what shall I do next? They were doing great with abundant nice green leaves and lots of flowers. (And keep disinfecting your pruning shears.) Val Bourne Helga then returned to Cornell to obtain a PhD, studying one of the model systems of plant defense. 1) Foliage discolored, brown, and dry This looks very much like an anthracnose disease to me. So, I’ve been involved in some indoor projects recently, and hadn’t been out paying much attention to my hydrangeas as they were coming back to life. The center of each spot will later turn tan. I think I read Hydrogen Peroxide could help for Anthracnose. It is week three of treating my hydrangeas for the fungi and the treatment is working. I have some ideas, but it seems a bit puzzling, since it sounds like you treat them both the same, and yet one has severe problems. Be sure to disinfect your pruning shears to be safe with 70% hydrogen peroxide or 10% bleach. Spider mites can cause that, but they like hot and… Read more ». We also have a ruby red slippers hydrangea and that one is blooming fine with no problems or spots. It’s been a very wet spring. Spray the leaves and stems of the hydrangeas every seven to 10 days depending on severity of the spotting. Had to heavily prune the other day. The RHS has a list of plants resistant and susceptible to honey fungus. It looks like a fungal infection to me, which could explain why the sevin didn’t help. You can try a product called Serenade. As the watering is done at the roots with an irrigation system throughout the day. May 30, 2017 - Explore sue andrepont's board "Hydrangea Disease" on Pinterest. Two days later I started noticing some browning on some of the leaves. See our TOS for more details. There is one generation a year with young nymphs hatching from eggs in mid-summer and sucking sap from the undersides of leaves. I made an error in my post about my hydrangea problems. There have been some problems with resistance, so it’s a great idea to try a systemic fungicide. I purchased a hydrangea tree about 3 months ago. It looks like an insect infestation to me, so that makes sense that the fungicide didn’t help. It’s raining here in Portland so I’ll wait a couple of days on the spray. I think the bottom of the leaf is the key to diagnosing the problem, but I am having a hard time seeing it. I have hydrangea that I planted a year ago and they came back, however some leaves have a yellow discoloration. The infected areas would all have white patches in them. Many different fungicides would work against this pathogen. There are several diseases that it could be. I have attached pictures of both. Hi Courtney, Your poor plants! That can be rust – another fungus. Unlike those caused by other pathogens such as Botrytis (aka gray mold), these spots will be circular or slightly irregular. 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. They should be able to help you. Now that she lives near Santa Barbara, California, she is delighted that many of these grow right outside! It sounds like you want to use a natural treatment. From what I understand, there isn’t much you can do but prune back the dead limbs. I’m not sure how to advise you to provide… Read more », Hi Helga, have discovered this sticky problem on my 5+ year old hydrangea bush in my front garden. 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. Thanks. I live in Michigan and have the plant in my house. Small, gray to white patches appear on the leaves. Not a Spot! I hope you are enjoying the summer. I’ll keep you posted. I’m not sure it is the same disease in all the plants, but it acts the same. Please let us know this product works on the hydrangea. 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