The Cause of Hydrangea Leaf Curl – The Leaftier. Garden Answers is a division of Garden Answers LLC., a Greendale, Indiana based company that offers cutting-edge plant identification technology for mobile devices and has built a community of gardening experts who offer advice and guidance to our users. These spots become larger lesions and can kill the leaves. Hydrangea Leaves Curling – Causes and Fixes, Hydrangea Leaves Turning Yellow: Why + How to Fix Yellow Leaves, Pothos vs. Philodendron: Differences + Identification with Pictures, Hoop House vs Greenhouse: Differences, Cost, Uses. Typically, leaves of hydrangea have a healthy proper structure. One of the nicest things about growing hydrangeas is that they’re relatively trouble-free. Prevention is definitely better than cure. In late summer the nymphs move to the stems where they overwinter before maturing in late spring. Leaf spots caused by a variety of fungi can occur on hydrangea. Photo (cropped) by Elizabeth Bush, Virginia Polytechnic Institute and State University, via via CC 3.0. Water deeply to flush these out of the soil around hydrangeas. Lots of diseases that affect hydrangeas will harm the leaves. 2. 1. It contributes to leaves lacking enough water leading to downward curling of leaves. Diseases of hydrangea are typically foliar, although root and flowers may also become infected by fungal or viral problems. They usually feed on the lower side of the leaf when it is young. Download Garden Answers Plant Identifier App Today! However, they should still be taken seriously. Maintain an appropriate temperature to ensure minerals such as phosphorus are not affected in terms of uptake. In particular, there are root rot, leaf spots, and powdery mildew. In essence, overwatering usually causes hydrangea leaves to curl downwards. Therefore, if the leaves start to curl, it means that there is a problem. They are planted against a south facing wall. You can use a potassium salt of fatty acids to control aphids. I don’t see any bugs so I assume it’s possible that it was caused by a pre-emergent. Spray underneath of foliage with insecticidal soap if you see tiny insects on the underside of leaves. My name is Alex K. Worley. There are some minerals that are essential to maintaining the state of leaves of the hydrangea plant. This disease also deprives the plant of nutrients. Hydrangea scale is a sap-sucking insect that develops on the underside of leaves on Hydrangea and some other plants. Some of the most common diseases to watch out for are funguseslike Armillaria root rot, which will destroy roots and prevent water from reaching the leaves and blooms. When there is an insufficient amount of water provided for the hydrangea plant, the leaves curl upwards. The first symptoms of this disease are small circular brown or purple spots, which appear on the leaves near the base of the plant. They also have a beautiful appearance. The main symptom is curly leaves. If an herbicide such as weed killer has been applied around the plant or on a lawn surrounding the plant this can cause what you’re seeing. 7 April in Problem solving. Excellent performance of hydrangea plants is guaranteed if the above preventive measures are followed. Leaf spots occur when a fungal settles on a wet surface of a leaf. Here are some of the means of preventing blade curling from taking place. Low-maintenance landscape plantings are most susceptible to get this disease. 1. 1a. But now the leaves are curling. This damages the cells early in the life of the leaf so that as the leaves open they are distorted. To control fungal diseases that cause leaf curling, spray sulfur-based fungicides. They either bend from the damage these diseases expose them to or as a defense mechanism to control the disease from attacking the plants severely. Or should I put it out if it’s misery? 3) Diseases. Cercospora Leaf Spot (also known as Cercospora hydrangea), is typically brown or purple colored spots at the base of the plant. In most cases, the leaves curl inwards. Cercospora Leaf Spot (also known as Cercospora hydrangea), is typically brown or purple colored spots at the base of the plant. I am a web geek, but you won’t believe how much I love gardening and connecting with nature. Then reproduction takes place, making the spot enlarge and spread to other parts of the blade. 1a. Ensure that from the time of planting up to maturity, the plants are neither deprived of water nor offered excess. Curly leaves are very disappointing to the gardeners, especially when they occur unexpectedly. For the prevention of fungal diseases, providing a well-ventilated area is crucial. There is no cure for a virus, but as we say, this is the least likely cause. Beckie’s reply: There is a good discussion of the pest you describe on the Toronto Master Gardeners website ( There is one generation a year with young nymphs hatching from eggs in mid-summer and sucking sap from the undersides of leaves. This article offers an explanation in detail on curling variations of hydrangea leaves, causes of curling, ways to stop it, and preventive measures that can be adapted to inhibit it. There is one generation a year with young nymphs hatching from eggs in mid-summer and sucking sap from the undersides of leaves. This then enables the plant to survive water deprivation for a bit longer. Tan spots with reddish brown borders form on the leaves. Herbicide damage. There are two types of fungal diseases can infect hydrangeas - cercospora leaf spot and anthracnose. Diseases such as leaf spots, powdery mildew, and root rot cause hydrangea plant’s leaves to curl. In most cases, the plant is able to recover with proper care. There are a few reasons that hydrangea leaves can curl like this - you can think about which one is more likely for your plant, but fungus isn't one of them so you can stop using any fungicide. Most common cause is a sucking insect such as aphids or lacebug feeding under the leaves when the foliage is young. Fungal Leaf Spots on Hydrangea Leaves. Home » Outdoor Gardens » Hydrangea Leaves Curling – Causes and Fixes. ... curl up, and fall off prematurely. They also curl to prevent more water loss to the atmosphere through transpiration. ★ How to: Diagnose & Treat Leaf Curl / Yellowing Leaves (Inc. In the previous section, we just touched on some of the causes, here we are going to go into detail about what actually happens. If needed, protectant fungicides can be applied prior to infection. Infection can be reduced by minimizing leaf wetness. This disease can affect most of the hydrangea varieties. The hydrangea leaftier larva (caterpillar) binds two or as many as four leaves together with strands of silk into a cup form and then feeds on the flower bud within. 3. They also curl to prevent more water loss to the atmosphere through transpiration. Now its starting to bloom inside my garage. Powdery mildew also leeches on the plant’s nutrients, causing the leaves to wither, a condition which makes leaves curl upwards. Usually with a virus you’ll also see yellowing of foliage not just the curling. Its still under 40 degrees outside, so I decided to put it inside my house until spring time in about a month (I Live in Zone 7b). Typically, the leaf or part of the leaf turns yellow and the edges thicken and curl. Here are the three different curling variations of hydrangea plant leaves. About mid March I removed the dead flower heads and pruned them, taking out about a third of the stems of each plant down to almost ground level. If the plant lacks phosphorus, the production of nutrients becomes ineffective, leading to the curling of leaves downwards. Fungal infections are caused by dampness. Appropriate insecticides should be sprayed on the plant leaves to control insects that cause them to curl. Avoiding actual curling of hydrangea leaves is the best way to go about this whole situation. This disease also deprives the plant of nutrients. A common leaf spot disease in the northeast is caused by the fungus Cercospora. The main reason for the upward curling of leaves is to seek protection from sunburn exposure now that they don’t have much water to emit. Fungal Leaf Spots on Hydrangea Leaves. According to their research, the curling of hydrangea leaves could be caused by one of two insects. Now that we have explained the different types of leaf-curls, it is good that we explain the causes.

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