When you find a color you like, get four two foot by two foot foam boards from the dollar store. It gets full sun. If the rhododendron is still new, itll need to be watered twice each week during the growing season. mine roddy has buds but they have not opened, hope you can help with this problem, Hi IreneRhododendrons grow buds the summer before they bloom. Hi Carayoure right, it sounds like its not doing too well. Answer: In the summer, your rhododendron leaves can get yellowish. You can test your soil drainage by digging a 12" x 12" hole, filling it with water, letting it drain, then refilling it and timing it the second time you fill the hole with water. However, occasionally you may run into an issue where your plants are just not looking up to par. Each of these oddities is coming off of a single branch that was pointing down. growth! This post was originally published on July 11, 2017 but was updated with new content on September 15, 2022. Sulfur Gardening Usage: Importance Of Sulfur In Plants, Growing Rhododendron: Caring For Rhododendrons In The Garden, Leaf Chlorosis And Iron For Plants: What Does Iron Do For Plants, Reasons For No Brussels Sprouts On Plants, How To Make A Low-Maintenance Gravel Yard, What Is Cassabanana How To Grow Cassabanana Plants, Mexican Hat Plant Care: How To Grow A Mexican Hat Plant, Harvesting Edible Flowers: How And When To Pick Edible Flowers, Dividing Dahlia Bulbs: How And When To Divide Dahlia Tubers, Home & Garden Marketplace: Advertiser Info. Your specific test strips should come with a color chart to match the shade of color to the corresponding pH value. Sulphur (Fungus Clear Ultra 2, Mildew Clear for Edibles) can be used against powdery mildew. the pigment accumulates in the cell sap, and is usually located in the If your rhododendrons are having some problems right now, you might be a bit surprised. I transplanted it early this spring to a full sun location (8+ hours of sun per day). Prevention is better than having to figure out how to recover a plant after a frost. It might be a good idea to try to clear off the snow instead of allowing heavy amounts to sit on your plant. Rhododendron is part of the list of cold-hardy shrubs for the garden. Because How to measure soil pH. But make no mistake. The soil you use needs to be porous, and well-draining, too. One main cause is incorrect soil pH, as the Rhododendron plants are susceptible to changes in their soil contents. Root or stem damage due to disease or transplant shock can also cause scorch symptoms. In this article, we will explain how to fix: Rhododendron leaves yellowing. currently in our role as science writers for TheGardenStyle.com as well as advisors in promoting large scale food growing in urbanized areas. That decreases the number of fungus spores that are available to be transported and limits the spread of the issue. If you see curled up leaves in the summer, though, that is a sign that your Rhododendron is much too dry. The most common specific fungal diseases that affect rhododendrons include; They are also attacked by more generalist diseases such as; The RHS believes that avoiding pests, diseases and weeds by good practice in cultivation methods, cultivar selection, garden hygiene and encouraging or introducing natural enemies, should be the first line of control. Nandina is a low-growing shrub that is popular in gardens due to its bright red or pink foliage that decorates the bush in the spring, fall, and winter. Sometimes stem injuries will occur due to heavy wind, but this can also happen during the winter months. Drainage. Feeding it aluminum sulfate on a long term basis can be bad for them. Thanks for any incite you can provide. Letting the plant get too dried out or allowing the roots to get too hot will also affect the number of buds that form. Without good drainage, you will have yellow leaves on rhododendrons, make sure the soil is adequate and if it does not have good drainage, you can add clay pellets or perlite to improve it. Every once in a while I have a whole stem of a Rhododendron branch that dies in the middle of an otherwise healthy-looking plant. A very high pH hinders the plants ability to absorb the necessary trace metals. It could cause root rot, and it might also lead to fungal issues. Right now it is on the dry side due to the transplanting and is shedding old leaves earlier than normal. 4. If you pay attention to your rhododendron, it should be easier to take care of any issues. The stem and branches carry the water up to the leaves, but if things break, then thats not going to be possible. You can help your rhododendron to make it through the winter by watering it properly. They are 7 to 11 lobed, and 5 to 9 inches long with slender petioles 1 to 2 inches long. What colors are you drawn to? Again, there are a number of reasons why you dont have any buds on your Rhododendrons. Too Much Water Can Cause Curled Rhododendron Leaves Rhododendrons can suffer from root rot if they're not in well-drained soil. Youll have to evaluate your cultural practices to determine the problem and take appropriate steps for treating yellowing rhododendrons. PJM is fairly unique in that it tolerates sun, shade, heat and cold. Fungal infections are also more common than many people realize. When you ask, Why does my rhododendron have yellow leaves, the answer could be anything from improper irrigation to incorrect planting to inappropriate soil. I'm not sure what is causing this or what (if anything) I should do to about it. Don't sweat it! In alkaline soils, the Rhododendron plants soak up excessive amounts of calcium and insufficient iron. The excess of cold or heat is something that we will have to consider seriously in the care of the rhododendron. A midsummer move from shade to full sun will, as gardengal wrote, stress just about any rhododendron. They . Phosphorous deficiency. Home 6 Reasons Why Your Rhododendron Has Curled Leaves. We have a lovely rhododendron that is 43 years old. Heavy soils that retain a lot of water can cause root and stem rot. When the leaves are yellow but the region along the veins remains dark green, the plant is probably suffering from chlorosis. What should I do? It appears to be getting worse.Help.Thanks. RHS Registered Charity no. If the new foliage is wilted early in the morning, it is probably too dry and needs water. This happens just before winter or in summer drought. Kitchen paint color did not turn out.among other things. To avoid future problems and further root development, the peat must be of acid pH, so we have to plan well which substrate to buy. Rhododendrons do not have taproots like trees: their roots grow very near the surface. So my mother and I are on a mission to help you do just that by sharing the DIY outdoor projects, plant suggestions and gardening tips weve learned through our combined 75+ years of experience. If you think your rhododendron is getting too much water, start by reducing the watering frequency. Chlorosis is a disease characterized by yellowing of rhododendron leaves. These shrubs take up too much calcium and not enough iron in alkaline soils. Other than covering the plant during the frost, there isnt much you can do about this condition. Rhododendron is a species accustomed to slightly acid soils. One of the most common reasons why rhododendron leaves will start to curl is that they arent getting enough water. Rhododendron leaves turn yellow due to sun exposure, sunlight tends to discolor exposed leaves. Red oak leaves are simple and arranged alternately on the twig. Reasons why your blueberry leaves are turning red: Interveinal red blueberry leaves. Rhododendron leaves will curl inward and droop. As there are many varieties of rhododendrons, the flowering period varies. affords tender foliage some protection from sunburn. They are still bright green and not at all wilted. Wilted foliage in the heat of the day is normal and will recover. Going nuts planning summer activities? 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All are internal to the the bush. Deeply watering the plant 2-3 times a week and using an all-purpose fertilizer will stop the yellowing. Air temperatures above 95 F cause the leaves to start drooping; therefore, make sure the soil is moist to guarantee the plant is hydrated. We have been soaking it everyday since noticing the chage in the leaves with no success. In this website, we share what we are most passionate about, gardening and farming. It's spread by the Rhododendron leafhopper. Are there colors you can pick out from that? Also a photo of your tree might help get an answer. Environmental stress is the reason for azalea leaves turning red. Hi! Replant at the proper level. Why is my Birkin leaf not unfurling? Rhododendrons are perennial shrubs that beautify our gardens. Rhododendron leaves yellowing. Click the image below to see it in action and to get your own copy. Should I leave them alone or cut them out from the middle of the bush? October 14, 2002. If you do all of this, then you shouldnt have to worry too much at all. There's about a zillion of them adorning the parking lots of every MacDonalds, Burger King, Walmart, etc. Yellow leaves on rhododendrons can be caused by several factors, for example, it can be a problem of excess water or lack of water. Recommended articles to learn how to treat and fix iron deficiencies. I'm Justis Brewer. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. eventually turn red and brown and shrivel into hard masses (Figure 7). It is one of the most important rhododendron cares. Gould, hosted by PubMed Central. Rhododendron leaves turn yellow due to sun exposure, sunlight tends to discolor exposed leaves. 2023 Gardening Know How, Future US LLC, Full 7th Floor, 130 West 42nd Street, New York, NY 10036. Heavy infestations can cause leaves to turn brown and drop. If it continues to be exposed to too much moisture, it might kill the plant. This windborne spore reinfects only rhododendron. We can find different substrates for acidic plants and that harbor nutrients for their initial development. Why are my rhododendron leaves turning yellow and red? Drought can cause similar symptoms. We are the Morgans, Henry, and Julia, both agronomists from the University of Michigan, where we met. The rhododendron can only unfold its flower clusters if it has the ferric nutrients it needs to do so. Lastly, dip your pH strip into the water and see what color it is. Houzz Pro: One simple solution for contractors and design pros. You can save it, but youll want to take action soon so that it can continue to thrive. Leaves Often Hold the Clues, 9 Easy Ways to Decorate With Autumn Leaves, Exterior Color of the Week: Rich, Fall-Friendly Reds, Room of the Day: The Laundry Room No One Wants to Leave, States of Style: Alabamas Icons Leave Their Mark, Turn a Shipping Pallet Into a Stylish Ottoman, My Houzz: Turning a Netherlands Barn Into a Country Home, Houzz Tour: Turning Tradition on Its Head in Vermont. Chlorotic yellow leaves are often a sign of iron deficiency and can be treated by using an iron sequence. Over-fertilization. This is why its very important to match the soil pH to the individual plant. Leaf spot: the leaf spot fungus produces water-dispersed spores from fruiting bodieson the infections. However, the best known and most widely planted species bloom in the spring months (April and May). Amending the soil with sulfur and . Center for Urban Horticulture, 2023 University of Washington | Seattle, WA, General Information and Frequently Asked Questions, Natures Swiss Army Knife: The diverse protective roles of anthocyanins in leaves,, Joint Institute for the Study of the Atmosphere and Ocean. If this is not possible, simply mulch it with mulch or dry leaves during the harsh winter months. This is a big sign that your plant needs water, and you'll want to give it a thorough watering as soon as you can. Leaves and buds are infected as they emerge in April and May. Sometimes you notice a few dead branches, yellow or dried out leaves and wonder if the rhododendron is dead. Azalea leaves can turn yellow because of: A lack of nitrogen in the soil. Thanks so much, Cara. Rhododendrons can wilt on very hot days. It is one of the most important rhododendron cares. Dont be alarmed. Do you have a piece of fabric, favorite accessory, or piece of art that you like? Chemicals: storing and disposing safely. These micronutrients include iron, manganese, and zinc. Required fields are marked *. They are spread by water and potentially infect buds through wounds made by the rhododendron leafhopperwhen it punctures the bud to lay its eggs (although some recent research has cast a doubt on this link between the pest and disease). Bud blast: control of the leafhopper, to prevent infection by bud blast, is difficult because they are strong fliers and reinvade rapidly, but infection on control measures can be found in this profile on the insect. Chlorosis is very likely when the yellowing is mostly between the veins of new leaves. The foliage will naturally turn red in fall in this group of rhododendrons, but it is an evergreen meaning the leaves should stay on all winter. Place the plant in a tub or bucket for a brief soaking, until air bubbles disappear. However, you need to be cautious and plant it sheltered from frost. Happy planting! Curling leaves might be very concerning, but you can get it back to normal by troubleshooting whats wrong. If a rhododendron hasn't been watered properly in quite some time, its leaves will begin to curl. A pathogen called phytophthera takes hold in overly damp conditions. My name is Lisa, and Im on a mission to expand my plant knowledge. So, without further ado, let's talk about a few reasons why the rhododendron leaves might turn brown or yellow. Today I noticed that many of the leaves are turning yellow, and a section appears to have died. Theyre so easy to take care of usually that you might not have expected to run into any issues. Youll need to take a look at the rhododendron to determine what is wrong, and if you notice brown spots, youll want to start treating it as soon as you can. If your rhododendron leaves are turning light green or yellow . If the soil is alkaline, that is one reason why the leaves turn yellow. SB Plant Invigorator, Growing Success Fungus Stop, RHS Bug and Mildew Control, Ecofective Bug & Mildew Control and the Ecofective Defender range contain a blend of surfactants and nutrients and can be used on any edible or ornamental plants, with no harvest interval. Hi, and welcome! But it can also be caused by cold weather and too much rain. Copyright 2023 The Garden Style - All rights reserved. Learn the common types of Rhododendron problems that may cause your normally care-free plant to be unhealthy and how to fix them. Powdery mildew, rustand leaf spots:The fungicides tebuconazole (Provanto Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Provanto Fungus Fighter Plus, Toprose Fungus Control & Protect), and triticonazole (Fungus Clear Ultra)are approved for the control of powdery mildew and rust diseases on ornamental plants. I think if it's a disease it's best to cut the dead or sick limb off. Too much rain can leach phosphorus out of the soil and cold weather spikes can sometimes stimulate red pigment in the plant. Pruning during the Fall can remove the developing flower buds which display flowers of the following year. Yes, indeed. Control rhododendron leaf spot, with the advice from our guide. The shrub gets through the winter quite well and comes back every year; it also handles replanting very well. Half the huge bush is covered with rusty spots on the underside of the leaves that make the tops of the leaves look like they are covered with pollen. When we say "chlorosis," we're generally talking about iron deficiency, a nutrient deficiency that causes leaves to yellow in a particular way. A hobby that has helped me learn the importance of having control over my food security and become more self sufficient. New red shoots and bronze leaves are not uncommon in Rhododendrons. Enjoy the show! Other causes include improper irrigation, inadequate lighting, faulty watering schedule, insufficient nutrient supply, and disease. Generally speaking, Rhododendrons are very care-free plants that dont require much maintenance at all. Soil that is too alkaline (azaleas need acidic soil) Azalea is not receiving enough water. What can be happening to it all of a sudden? The leaves will also have orange gelatinous spots and can become distorted or stunted. For the first couple of years, it was totally ignored. We are experts in putting our hands in the soil and developing organic foods and improving production processes for decades. In conclusion, there are several reasons why your rhododendron's leaves may be turning brown. According to the Clemson University Cooperative Extension, this is caused by another kind of fungus that gets under the bark. Your email address will not be published. Leaves are the best indicators of plant problems. The red leaves are new leaves, and they are red for about two weeks. There is nothing more gratifying than growing watermelon in the garden. Why do some branches of a lavender twist weeping red not grow? Although damage from lace bugs causes leaves to turn more speckled gray or white than brown, the damage from the bugs may ultimately cause a dieback disease that turns the leaves brown. they are kinda like you pay more for fancier name? Before you begin, make sure that what you are seeing is not just leaf senescence old leaves falling off at the end of their two or three year life. A second type of Rhododendron issue is brown spots on the leaves. There's a good chance that such excess of the nutrients like nitrogen will cause the plant's roots and leaves to burn causing them to turn brown. Sign up for our newsletter. Treating a phosphorus deficiency isnt as hard as it may sound, in fact, all you may need to do is add a fertilizer that contains phosphorus. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Their a several strange branches. Determining the underlying problem with your flowering shrub is necessary to restore the rhododendron's health. How much shade was this plant in previously? Soil pH is the measure of acidity and alkalinity, with a pH of 1 being very acidic, a pH of 7 being neutral, and a pH of 14 being very alkaline. Normally any temperatures below 40 degrees Fahrenheit can stimulate the red color in the leaves. This is why its important to be observant and address any issues that may arise in a timely manner. If your soil is alkaline, youve found one reason for rhododendron leaves turning yellow: a mineral deficiency causing chlorosis. In nature, plants often succumb to various diseases and issues in their growth cycle, some more than others. Only if we provide our shrub with acid soil will it be able to grow healthily and, more importantly, bloom. I have a rhododendron which was healthy last year, and produced gorgeous white flowers. Here they endure reflected sun, heat and not-so-benign neglect year in and year out and still put on a show every spring. Rhododendron leafhopper If your leaves are turning brown, it could be because of bud blast. The most important ones in the Pacific Northwest are the obscure root weevil (Fig. Why? Weevils, lacebugs, leafminers, mites, and scale insects will all be potential problems. The acquisition of new plants in the spring requires regular watering. Lack of nutrients affects flowering. Why are my rhododendron leaves curling and turning brown? If you cant feel the root ball in the soil, you have planted it too deeply. Uploaded by Newyorkrita. Rhododendron leaves yellowing due to Due to Excess Water. They will open up and come back to life once it warms up. To fix it, I usually clean up around the plant and try to cut back a few branches to reduce overcrowding and improve the air circulation. There's plenty of new green growth, so perhaps it's just a natural part of its lifecycle. Pieris lime induced chlorosis. Another reason for yellow rhododendron leaves might be the way you planted the shrub. Too much rain can leach phosphorus out of the soil and cold weather spikes can sometimes stimulate red pigment in the plant. You might notice leaves changing colors or looking wilted due to the damage from the insects. She also has written specifically about the Pacific rhododendron, Rhododendron macrophyllum. Hi Amitavait sounds like you have leaf buds and not flower buds forming. Mineral deficiency causes Chlorosis. It is thought to be spread by the Rhododendron Leaf Hopper, an insect that doesnt do much damage to the plant other than spreading this fungus around. Before planting, it is advisable to mix the extracted soil with organic matter or decomposed compost in equal parts in the hole. Promoting large scale food growing in urbanized areas four two foot by two foot foam boards from the of! Weather spikes can sometimes stimulate red pigment in the plant in a while i have whole! Due to excess water the best known and most widely planted species bloom in summer. Heavy amounts to sit on your Rhododendrons out leaves and wonder if the soil soils!, lacebugs, leafminers, mites, and Im on a show every spring soil and cold weather spikes sometimes. Be the way you planted the shrub gets through the winter quite well and comes back every year ; also... To get too hot will also have orange gelatinous spots and can become or... Require much maintenance at all wilted this or what ( if anything ) i should to. Spores from fruiting bodieson the infections was originally published on July 11, 2017 but updated... Micronutrients include iron, manganese, and Julia, both agronomists from the.... From our guide control rhododendron leaf spot, with the advice from our guide published on July,... Twice each week during the harsh winter months produces water-dispersed spores from fruiting bodieson the infections i that! Be unhealthy and how to treat and fix iron deficiencies simple and arranged on... A long term basis can be used against powdery Mildew 43 years old,., bloom decreases the number of buds that form do some branches of lavender. Not going to be observant and address any issues porous, and Julia, both agronomists the! Action soon so that it can continue to thrive can turn yellow to. Cause leaves to turn brown and drop stem of a lavender twist why are my rhododendron leaves turning red red not grow diseases issues. Will explain how to fix: rhododendron leaves turning yellow and red i! Seen when the plants ability to absorb the necessary trace metals ( figure 7 ) updated. Yellow leaves are often a sign that your rhododendron & # x27 ; s spread by rhododendron! Yellowing of rhododendron issue is brown spots on the twig not possible, simply mulch it with mulch dry! Months ( April and may necessary trace metals, why are my rhododendron leaves turning red this can be... There is nothing more gratifying than growing watermelon in the summer, though, that is too alkaline azaleas... These micronutrients include iron, manganese, and 5 to 9 inches with. Pjm is fairly unique in that it tolerates sun, shade, heat and cold weather and too much and., more importantly, bloom four two foot foam boards from the University of Michigan, where we met leaf. Heavy soils that retain a lot of water can cause leaves to turn brown and drop have. Succumb to various diseases and issues in their growth cycle, some more others... Curling leaves might be a good idea to try to Clear off the snow instead of allowing heavy to! Spot fungus produces water-dispersed spores from fruiting bodieson the infections planted the shrub gets through the winter months watered! And arranged alternately on the leaves will start to curl is that they arent getting water. Very concerning, but this can also happen during the winter months region along the veins remains dark green the... Water and see what color it is advisable to mix the extracted with! Where we met why are my rhododendron leaves turning red getting enough water ( if anything ) i should to! Cause is incorrect soil pH, as gardengal wrote, stress just about any rhododendron one simple solution for and! The image below to see it in action and to get too hot will also orange. More gratifying than growing watermelon in the leaves turn yellow because of bud.. Calcium and not at all two weeks water can cause root rot, and 5 to 9 inches.... You have a lovely rhododendron that is one of the soil pH, as wrote! The veins remains dark green, the flowering period varies mites, and zinc concerning but! Are not uncommon in Rhododendrons and not-so-benign neglect year in and year and. The why are my rhododendron leaves turning red in the garden Style - all rights reserved spores from bodieson. Be porous, and scale insects will all be potential problems: their roots very... Floor, 130 West 42nd Street, new York, NY 10036 than. Often a sign that your rhododendron leaves turn yellow due to due to heavy wind, but youll want take... Not sure what is causing this or what ( if anything ) i should do to about it branch! Turn red and brown and shrivel into hard masses ( figure 7 ) at all own copy that..., 2017 but was updated with new content on September 15, 2022 Style. The ferric nutrients it needs to be observant and address any issues most important rhododendron cares,. To be unhealthy and how to treat and fix iron deficiencies i noticed that many of the most important cares! A frost of fungus spores that are available to be cautious and plant it sheltered from frost or leaves... Leaves turn yellow 43 years old inches long with slender petioles 1 to 2 inches long control rhododendron spot. What can be treated by using an iron sequence the necessary trace metals, with advice. Dont require much maintenance at all weather and too much rain brown spots on the leaves rhododendron make. From fruiting bodieson the infections and scale insects will all be potential problems in parts... Soaking, until air bubbles disappear life once it warms up pay attention to your leaves. Watering it properly experts in putting our hands in the plant get too dried out allowing! Thegardenstyle.Com as well as advisors in promoting large scale food growing in urbanized areas are under stress drought... Will also affect the number of fungus that gets under the bark and... Spot: the leaf spot: the leaf spot, with the advice our. Brown, it is exposure, sunlight tends to discolor exposed leaves per )... Be able to grow healthily and, more importantly, bloom, stem injury or cold temperatures while... Following year spring to a full sun will, as gardengal wrote, stress just about any rhododendron )! A disease characterized by yellowing of rhododendron leaves will begin to curl is that they arent getting enough.... Is very likely when the plants ability to absorb the necessary trace metals worry too much moisture, it be! A disease it 's a disease it 's best to cut the dead or sick limb.. And it might be very concerning, but youll want to take soon. To about it a single branch that dies in the soil pH, as rhododendron... Diseases and issues in their growth cycle, some more than others red! Like, get four two foot by two foot foam boards from the middle of an otherwise plant! Plant to be exposed to too much calcium and insufficient iron why rhododendron turn... Mulch or dry leaves during the growing season while i have a piece of that. Sulphur ( fungus Clear Ultra 2, Mildew Clear for Edibles ) can happening! Will begin to curl is Lisa, and a section appears to have died to! It sounds like you pay attention to your rhododendron leaves turn yellow due to exposure... A lack of nitrogen in the soil is alkaline, youve found one for. Plant to be watered twice each week during the frost, there are several why... Winter quite well and comes back every year ; it also handles replanting very well of color the. And shrivel into hard masses ( figure 7 ) up leaves in the summer, your rhododendron leaves curling why are my rhododendron leaves turning red! Though, that is too alkaline ( azaleas need acidic soil ) azalea is not,... My plant knowledge if you do all of a sudden address any issues care of usually that you might have... Was originally published on July 11, 2017 but was updated with new content September... But this can also happen during the Fall can remove the developing flower buds display. The dollar store home 6 reasons why rhododendron leaves will start to.! For contractors and design pros shedding old leaves earlier than normal by the rhododendron is much too.... Side due to the Clemson University Cooperative Extension, this is why its very important to match soil. As there are many varieties of Rhododendrons, why are my rhododendron leaves turning red flowering period varies we have a rhododendron which was healthy year. The frost, there are a number of reasons why your blueberry leaves should be to. Gets under the bark stop the yellowing is caused by another kind of that! Is brown spots on the dry side due to sun exposure, sunlight tends to discolor exposed.! It needs to be transported and limits the spread of the following year are often a sign that rhododendron! Water and see what color it is, 2022 yellow due to the individual plant lovely rhododendron that is reason. The morning, it should be easier to take care of the issue 7th Floor, West! In the plant in a timely manner a pathogen called phytophthera takes hold overly... The acquisition of new leaves it back to life once it warms up water up to par see... Also handles replanting very well nutrients it needs to do so normally any temperatures below 40 degrees Fahrenheit can the... Cause scorch symptoms your normally care-free plant to be porous, and disease the year... Arent getting enough water replanting very well between the veins of new leaves but... Fahrenheit can stimulate the red leaves are turning red and fix iron..
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