Are the plants in the shade? Fungal Leaf Spots. Avoid planting it in hot, dry, exposed sites. Leaf spots caused by Cercospora, Alternaria, Phyllosticta or Anthracnose stem from a fungal disease. The are maybe half of the leaves not fully developing. I planted my first hydrangea a couple of months ago and I’m afraid it’s not doing well at the moment. I don’t like to use the toxic fungicides so switched to a copper one. I’m going to cut off the impacted leaves and spray the rest with fungicide. White spots can appear on the skin when protein and dead cells become trapped under the surface, or when there is a loss of pigmentation. We are so glad that you found the article informative! Quickly remove infected plants and their parts. Hi there Dr. Helga! It looks like a nasty case of powdery mildew, which is usually resistant to fungicides. If you are growing your hydrangeas in containers, you can avoid tomato ringspot virus by using a soil mix that is free of nematodes. Seems to have flushed away the fertilizer from the roots. Another option is to use neem. Like leaf spot, this malady likes warm, wet weather and spreads by splashing water. The leaves, buds, and growing tips will become disfigured as well. Plants are looking much better. Thank you. Brown spots appear, grow in size and spread over the plant. I planted two limelight hydrangeas last year, and last year they developed the same lesions. Different chemicals are required to kill it. Would you like to try uploading your images again? Thank you for posting pictures. May 30, 2017 - Explore sue andrepont's board "Hydrangea Disease" on Pinterest. Hi Tina! They have been there for seven years. Hi Roger, Thanks for the status report! Hi Jorge, Thank you for your update! If that doesn’t work, I would move onto a more aggressive insecticide, such as pyrethroids. Rust spots occur with too much direct sunlight after overhead watering. Do you have any idea what it is please? I hope you are enjoying the summer. We live in Indiana. i think the problem with your hydrangea flowers could be the amount of sun. It should be readily available at your local garden center. The white spots of powdery mildew will spread to cover most of the leaves or affected areas. You can see white, cottony growth on the bottom of the leaves. I’m sorry that your macrophyllas have a new affliction. 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 . Hydrangea scale is a sap-sucking insect that develops on the underside of leaves on Hydrangea and some other plants. That kind of leaf distortion is usually from a viral infection or an insect infestation. I have already put in an order with Amazon for Mancozeb. I pruned them both back this spring and one of them is already growing some full leaves. When a spot encounters a leaf vein, it spreads along it, forming an angular brown or black patch. Hopefully, they can exterminate them! Powdery mildew fungi also cover the flowers and new shoots of infected plants. Hi Japjeet, I’m sorry to hear that. It looks like anthracnose to me. I haven’t read about neem oil being used to treat anthracnose on hydrangeas, but it can be a great fungicide. Copper works, too, so that was a good choice. I appreciate all of your help! Had to heavily prune the other day. Leaf spots are dark reddish-purple and may have angular edges, where they are bordered by leaf veins (Photo 1). Hi Dlyn, I’m so sorry about the transformation of your hydrangea plants. However, this fungus usually produces colored fruiting structures on the infected branches. Plus, using the same one repeatedly can cause resistance. As the lesions get larger, the leaves can turn yellow and fall off the plant. Hydrogen peroxide is pretty unstable over time, and you will want something that will keep providing protection against the fungi. The mature scales are around 3mm in diameter, oval in shape and brown. The small specks generally go unnoticed. I would recommend the same fungicides listed in the response to the second to last question below. The first is try and flush the excess fertilizer out of the soil. You can also apply the fungicides chlorothalonil or thiophanate-methyl. The blooms all look sort of dead… They don’t have any color. Last year, I started noticing the brown spotting. Cercospora Leaf Spot typically appears in late summer and fall. I don’t understand. I didn’t fertilize but it’s pretty wet this year. The one that is all sticks was the one that was iffy last year and they have not bloomed in 2 years. May 30, 2017 - Explore sue andrepont's board "Hydrangea Disease" on Pinterest. Having trouble identifying what is going on. Powdery mildew first appears as small white spots on the upper part of the leaves. It’s always the ones I have in pots. Since then I moved the pots indoor to protect them from further damage. If you could provide more of a description of what is going on, that would help me give you advice. I would also prune off all of the infected leaves. You are the best. Then the leaves of the plant will start to be distorted and rolled, and the growth of the plant will be stunted. I’m so sorry to hear that. Leaf spots on a hydrangea are caused by the fungal infection cercospora. Whereas this infection is mostly prevalent in big field plantations or greenhouses of carefully managed hydrangea, outbreaks can also reach residential areas and affect your garden. Fifteen different viruses afflict hydrangeas! Thanks, Jorge, Hi Jorge, I’m so sorry about the scorched leaves on your hydrangeas. One way to control this disease is to apply a fungicide as soon as you discover it. Treat your pruning shears with bleach as you prune, so you don’t accidentally spread any disease. Are they round circles of one color, or do they have rings around them? Best offers for your Garden - ----- Hydrangea Plant Diseases. My hydrangeas are blossoming! Continued rainy weather or heavy fog produces the conditions that favor infection. They are blue, pink and white in color! Thanks. Although Cercospora rarely kills its target plant, its effects are aesthetically undesirable, while sometimes reducing plant vigor and hindering flowers bud formation. There is also a very nasty fungus that can cause spots on the stems and the leaves to die back. It is only this plant that has this condition. Try that and see if it works. Unfortunately, if it is this virus, there is no cure. You can check for that if you carefully lift up some of the soil in the pot and look at the roots. Have you added anything to change the color of the flowers this year? Pretty much the same result. It’s difficult to diagnose without seeing it. Powdery mildew is most likely to be a problem on hydrangeas when the days are warm and the nights cool. We have had an ongoing problem with dieback on certain plants in our yard for years. I have some doubts about using hydrogen peroxide to treat anthracnose. The branches wilt and then die back, usually in the fall, and the brown leaves cling after the other leaves drop. Don’t compost them or leave any on the ground. Hydrangeas can get minor pests and diseases such as powdery mildew, leaf spots, aphids, and scale insects. Would it be possible to provide any pictures of earlier stages of the disease when the lesions are small? I think the bottom of the leaf is the key to diagnosing the problem, but I am having a hard time seeing it. It starts out with lesions that are angular shaped and dark brown to purple, and it also starts from the bottom of the plant. That disease also spreads to the leaves, and it looks like that is the case from your photos. Typically the biggest cause is a fungal problem. Fertilized on March 31. I’m sorry it’s not better. Thank you for the words of encouragement. In case it is anthracnose, what is best to buy to prevent it in the future? I hope it works out for you and look forward to your next update! There are two prominent insects that suck on hydrangea stems and damage them. Too much sun can also cause the leaves to turn brown, so hopefully it’s not another fungus! Hydrangeas are susceptible to Cercospora leaf spot, anthracnose, and powdery mildew. I’m also debating Cercospora leaf spot. White spots and cool weather with a storm immediately made me think of powdery mildew. They were doing great with abundant nice green leaves and lots of flowers. Water thoroughly past the shrub’s root zone. Get your first 3 months of Saga Magazine for just £3 and enjoy a world of benefits when you subscribe. Common pests and disease. I’m so happy to hear it, and I’m glad that they are a pleasure for you now instead of a stressor. Fungal disease in moist conditions, especially those that take place during warm weather will cause leaf spots. These particular plants are about 6 years old. Unfortunately, this kind of fungus develops resistance very quickly. Hi Courtney, Your poor plants! The bacteria that cause this disease can enter the plant through natural openings like stomata or through wounds. Abstract. The leaves can turn brown from having wilted if the plant is not getting enough water. I’m hoping it has just been over fertilized. The other is to put mulch down. Hi Kathy, I am so sorry to hear that your hydrangea is having problems with its flowers. I bought two pots of endless summer hydrangeas last year from Lowe’s. It seems like their stems are stung by an insect which suckles the juice, the stem shrinks and then dies! Thanks so much! This disease can affect most of the hydrangea varieties. We are rare on the West Coast. Would it be possible to post pictures? The spots darken and become angular in shape. Not sure if I did not give it enough water, but there are spots on the leaves. Infection can be reduced by minimizing leaf wetness. A couple days after I planted them we had frost for about 3 mornings. The fungus produces large brown spots on the leaves or flowers that will become more lightly colored in the centers. I will do that and hopefully will be able to save it. Leaf spot diseases Since, most ailing hydrangea symptoms are foliar, the number one cause is usually fungal. 70% rubbing alcohol or 10% bleach. Does that look like what you are seeing? The leaves are pretty uniformly discolored. Help. This appears days after the anti-fungal spray and I’m wondering if the brown edge is a different problem than the spot fungus I was originally treating. 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