I will attach some pictures. This spring began with abundant new foliage from the roots but in the last few weeks leaves are again discolored. Hi Helga. Had you just fertilized them by chance? Hydrangeas can get minor pests and diseases such as powdery mildew, leaf spots, aphids, and scale insects. 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’s anthracnose. Scale insects are tricky to eradicate so, rather than recommending a chemical, I would cut the entire bush down to the ground in spring and dispose of all the trimmings. Typically, these are white and waxy and, as you say, quite large. Pick up any spotty leaves that have fallen and throw them out with the trash. Not sure if it is due to the hot weather and causing the flower to burn. Let us know when your hydrangeas have been cured. I hope this is not causing it to be a water from top approach. Watering without getting the leaves wet will help to prevent these diseases. Hello, I’m having serious problems with two plants I bought last summer for large containers. The problem is caused by a fungus that spreads via spores in wet or humid conditions. The bacteria that cause this disease can enter the plant through natural openings like stomata or through wounds. Is that correct? Thank you for providing pictures. Any ideas? They are most prevalent in moist conditions, although some occur in warm periods, while others form in cooler temperatures. Photo by Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org. Your picture didn’t upload, so I can’t comment on the disease. If you have a persistent problem, you may need to use fungicides. Are they round circles of one color, or do they have rings around them? Hydrangea are important bacterial diseases of h quercifolia (Oakleaf hydrangea), H. macrophylla, and are most commonly affected by . See more ideas about hydrangea diseases, hydrangea, planting hydrangeas. That’s a sunken lesion in the bark. They are permitted… Read more », Hi Helga… Look at the pic. I appreciate all of your help! Thank you for your answer. Are there any circular lesions on the leaves? If that doesn’t work, I would move onto a more aggressive insecticide, such as pyrethroids. The small specks generally go unnoticed. Anthracnose occurs sporadically in the landscape and only effects bigleaf hydrangea (Hydrangea macrophylla), what some folks call "mophead" or "French" hydrangea. I have attached pictures of both. That would make it easier to diagnose them. 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. Please do keep us posted! That’s horrible! These spots become larger lesions and can kill the leaves. Also, the stems look like they have bumps on them. Powdery mildew causes hydrangeas to develop small tufts of gray or white powdery mildew on the leaves of the plant. Powdery mildew first appears as small white spots on the upper part of the leaves. These typically produce large snowball-shape flower clusters in shades of blue, pink, red or white. Here is an article on how to deal with them: Doing Battle with Japanese Beetles: Tips for Banning Them From Your Garden Now about the flowers. Hi, I live in south of UK with a small garden. Are they in full sun, or do they get… Read more ». Hydrangea scale is a sap-sucking insect that develops on the underside of leaves on Hydrangea and some other plants. / 05 April 2019. I’m not an expert on azaleas, but my guess would be that it is Cercospora leaf blight (caused by a fungus, too). My hydrangeas are blossoming! What do you think the problem is? Plants are looking much better. Do you have any idea what this could be? Good luck, and let us know if you get rid of them. The leaves are pretty uniformly discolored. The plants also grow better… Read more », Hi Helga! Thanks Helga! This is a pretty harmless leaf fungus with a scary name — Cercospora! What do you recommend? As the watering is done at the roots with an irrigation system throughout the day. This fungus can severely affect the flower buds and even kill them before they open. Thanks. Be sure to disinfect your pruning shears to be safe with 70% hydrogen peroxide or 10% bleach. The plants themselves look fine. Also, they like hot and dry weather, which doesn’t sound like an issue at the moment. Also, drafts from a heater can cause problems, too. We have had an unusually cool spring with some nights in the 40s. Please don’t doubt your gardening abilities. Honestly, I’m not sure about the cause of the… Read more ». Cercospora Leaf Spot typically appears in late summer and fall. Thank you! I have hydrangea that I planted a year ago and they came back, however some leaves have a yellow discoloration. There are no chemical treatments against it at the moment. You can see white, cottony growth on the bottom of the leaves. Is there a chance that you could post a picture of the flowers? Are the leaves folded and stuck together? Fungal disease in moist conditions, especially those that take place during warm weather will cause leaf spots. Also, I still use the serenade treatment. - Botrytis: it is a disease due to a polyphagous fungus, which alternates periods of saprophytic life with others of parasitic life. This limpet-like insect also feeds on acers and cherries. I just got fresh water hooked up to my main water this season because I hate having a constant fertilizer for my plants. Hi Alan, I’m sorry to hear about your rhododendron! But fungi are very good at developing resistance to fungicides. Also, it won’t remove an existing infection. I’m so sorry. Bacterial leaf spot in hydrangeas is caused by the pathogen Xanthomonas campestris and affects primarily Hydrangeae quercifolia, Hydrangeae arboreacens and Hydrangeae … J. of Phytopathology – Corynespora, Cercospora, 2. It is common from summer through fall. Thank you for the pretty picture! We have heavy shade and heavy soil in our yard, and hot summers here in Columbia, SC. If your plant has disease symptoms, this article can help. I am in zone 7 (East Texas) and we have sandy soil. If it’s any comfort, I’m struggling to identify the problem, too! Will try methods used in this post. It can turn whole leaves purple, which makes me think that it might be… Read more », I’m sure I can soon. Did the other spray help at all? Then the leaves of the plant will start to be distorted and rolled, and the growth of the plant will be stunted. Hi thank you for the informative article. Dear Amanda, I’m so sorry that your photos won’t upload. It destroys the roots, so the plants can’t take up water and wither away. It can be treated by a variety of cultural moves as well as spraying a fungicide. Normally, it would have taken me weeks to learn what it was and how to treat. You should also prune back the infected parts of the leaves and flowers. I’m so sorry to hear that. Should I cut off the stems with the curled up leaves, leaving the healthy looking ones in place? I’m not positive, but I suspect it might be due to Hydrangea Chlorotic Mottle Virus. However, you can try a different fungicide to see if the new growth will be enough to save them. Thanks! It can be treated by a variety of cultural moves as well as spraying a fungicide. My hydrangea has “rust-like” spots on the stems of the plant….. they are currently getting ready to bloom. Your third picture looks like insect damage to me, but I can’t find anything that looks precisely like them either. Most people buy hydrangeas when they are blooming, but spring or fall is the best time to set them out. It’s only on the macrophyllas I notice it. A reader's hydrangea seems to have caught a disease. TIA. Read more about identifying and treating anthracnose on hydrangea here. When it’s unusually rainy (or if you’re overwatering), hydrangeas’ leaves develop unsightly, black spots. Here is more about what we do. I’m currently using Natria Disease Control. This disease doesn’t usually harm the plant but is aesthetically problematic for some gardeners. Hydrangeas like cool temperatures (50-60) and ideally should go back outside when the weather improves. Discard any leaves with traces of mildew or fungus. Other names for the disease are white canker, watery soft rot, timber rot, damping off, pink rot wilt, crown rot and several other descriptive names. The leaves of infected hydrangea are often discolored, and the plant becomes stunted. I don’t like to use the toxic fungicides so switched to a copper one. Be sure and sterilize your pruning tools between cuts with bleach or rubbing alcohol, so you don’t spread the infection. In the Autumn (Fall) we pruned the branches back by 2/3rds. Is there anyway that you can reduce the size of them and try again? Leaf spots are dark reddish-purple and may have angular edges, where they are bordered by leaf veins (Photo 1). Anthracnose can be fatal to the plant, so it’s important to treat the infection. However, to be sure that it is Verticillium and not something else,… Read more », A million thanks, Helga! Hi Helga- thank you for your expertise. I suspect that you are right about frost damage. If needed, protectant fungicides can be applied prior to infection. We had some rain on sunday and then humid weather. This is happening on a limelight and a strawberry vanilla hydrangea. If sprinklers are used, always water early in the morning to encourage rapid leaf drying. We have seen cat present around our flower beds. Look at the base of the plant and see if there is a canker there. The white flaky stuff is on the ground under the bush, too. Spider mites can cause that, but they like hot and… Read more ». , Helga as sunspots, occur after excessive sun exposure the hydrangea poor! Water, but I ’ m not sure if it could be the growth. Measure 1/8 to 1/4 inches in diameter during the months of July through October leaf drying fungicides more time work... Then the leaves of infected hydrangea are afflicted with something doubts about using hydrogen peroxide to the... Bull'S-Eye effect for HP that is the causal agent of bacterial leaf spot is one generation a year with nymphs! 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