Also, they like hot and dry weather, which doesn’t sound like an issue at the moment. There is also some brown sap running from some cut branches. The spots darken and become angular in shape. We have had an unusually cool spring with some nights in the 40s. We had some rain on sunday and then humid weather. I’m sorry that your macrophyllas have a new affliction. However, the fungus quickly evolves resistance to fungicides, so it’s a battle to stay one step ahead. Unfortunately, if it is this virus, there is no cure. Another thing to do is pick up all the leaves and debris from under the plants and dispose of them away from your garden. That’s horrible! Thanks! The spray you provided contains neem oil, a natural fungicide, but it might not be strong enough to kill this kind of fungus. The product just arrived and I used it Saturday. I just received these hydrangeas the day I sent them to you. These hydrangeas are heirloom, 7th generation plants, and they’re dying quickly. Treat your pruning shears with bleach as you prune, so you don’t accidentally spread any disease. It would help me to figure out what the cause is. It definitely looks like an infection. I take off the bad leaves, but throughout the growing season they keep getting ugly leaves. You should also get rid of any fallen leaves. Is it worse on the undersides of the leaves by chance? Will I make a mistake to bring it into my home? Also, cut off the infected leaves (and disinfect your pruning shears with 10% bleach or 70%… Read more ». I will continue to treat the hydrangeas and try not to give up. I get them with the leaves curled and crunchy, some varieties more then others. Botrytis is more likely to be a problem under cool and damp conditions, such as several days of cloudy, humid, and rainy weather. Thanks Helga! Two days later most of those leaves were showing brown spots. We acquired 2 hydrangeas last year and planted in fairly large pots. Hi Rosemary, I’m so sorry to hear that. The one that is all sticks was the one that was iffy last year and they have not bloomed in 2 years. I’m not sure what could be causing it. Or you could be right about anthracnose. Be sure and disinfect your pruning shears after you are done. If so, let us know in the comments. Hopefully, they can exterminate them! Waterworth received a Bachelor of Arts in American history from Columbia College. Hydrogen peroxide is pretty unstable over time, and you will want something that will keep providing protection against the fungi. Powdery mildew is most likely to be a problem on hydrangeas when the days are warm and the nights cool. Hi Summer, I’m so sorry about your hydrangea! Hi Brian, I’m sorry that your hydrangea has such horrible symptoms! Do you have any idea what it is please? We occasionally link to goods offered by vendors to help the reader find relevant products. There is also a very nasty fungus that can cause spots on the stems and the leaves to die back. While these conditions make people miserable, the leaf spot fungus kicks up its heels. The plants themselves look fine. I made an error in my post about my hydrangea problems. Also look… Read more ». 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 . Would it be possible to post pictures? A highly contiguous fungal disease, powdery mildew affects many different species of plants, including hydrangeas. Many different fungicides would work against this pathogen. Helga then returned to Cornell to obtain a PhD, studying one of the model systems of plant defense. Would it be possible to provide any pictures of earlier stages of the disease when the lesions are small? WATCH: Grumpy Gardener's Guide to … Help!! I just got fresh water hooked up to my main water this season because I hate having a constant fertilizer for my plants. Actually, I don’t think it’s powdery mildew. Is there anyway that you can reduce the size of them and try again? Hi Ruth, Hello from a former Delawarean! Let us know how it’s doing in a week or two, and I hope it will be a good status report! That is effective on many plants. I don’t like to use the toxic fungicides so switched to a copper one. I would also prune off all of the infected leaves. What do you think? I will do that and hopefully will be able to save it. The hydrangea is a deciduous shrub characterized by its blossoms and green foliage. I’m currently using Natria Disease Control. Could this have caused the decline? 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! Have you fertilized them recently? A really common reason for hydrangea flowers to turn brown is that they are getting too much sun. My hydrangea has something going on and it is not good! You could start with neem oil, which is readily available. That is always a huge help. That makes me wonder if something else might be going on. Also did a little bit of pruning. (not sure of variety): Last spring stems became leggy and foliage discolored. The other is to put mulch down. (And disinfect your pruning shears or flower-cutting knives whenever you use them!). Had to heavily prune the other day. I can’t be sure, but it looks like it might be Japanese beetle damage. Water your plants at the bottom, so the tops will not get wet. Our borders grow shrubs vigorously so we tend to plant in pots. I am happy to provide more details. I’m also debating Cercospora leaf spot. I am glad to see that there is some growth in the center of the plant. Am I too late to save… Read more », Hi Pam, What distressing pictures! 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. Hi Helga, my hydrangea Nikko has these abnormal spots on them. The fungus lives in the soil for many years, and there is no way to get rid of it. They should be able to help you. But typically it… Read more ». I would suggest sending some leaves to your county extension office to see if they… Read more ». This year I took a lot of the deadwood off early in spring. 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. I’m so happy to hear it, and I’m glad that they are a pleasure for you now instead of a stressor. Thank you so much for all the information! That could be why you had problems with your other trees. You can read more about growing azaleas in this article, and feel free to post any additional questions you may have there. If you could provide more of a description of what is going on, that would help me give you advice. While the leaves on my other Oakleaf are getting large and full, the leaves on this hydrangea have stopped growing. As the watering is done at the roots with an irrigation system throughout the day. Look for little webs on the leaves. If it’s Botrytis blight, that would also attack the flowers, which would be covered in a grey mildew. Hydrangea is a favorite food for many scale insects, including the cottony hydrangea scales. There are no spots. That is awesome that you removed the debris! Have you been through a drought lately? Hi Michele, I’m sorry that your hydrangeas are afflicted by something. Bait any ants that are tending the pests to allow predatory insects to destroy the scales. I hope this is not causing it to be a water from top approach. Any advice would be greatly appreciated! 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. Hi there Dr. Helga! Lots of plants blooming, so I am enjoying the summer! Sorry~ I couldn’t figure out how to add the photos on my first comment, so they’re coming separately. Another option is to use neem. Scales are easy to control if infestation is not severe. There are two prominent insects that suck on hydrangea stems and damage them. From what I understand, there isn’t much you can do but prune back the dead limbs. Help. Good luck, and let us know if you get rid of them. This rust only infects the smooth hydrangea, H. arborescens, and hemlock as its alternate host. You suggested that could be the problem or possibly that I overfertilized. Cool weather favors many types of fungal infection, but I’m not sure if that is the case with anthracnose. 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. 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