Generally, they don’t actually hurt the plant that they are living on, since they make their own food. The mealybugs may be found on lower leaf surfaces and stems. Tiny, green or pink, soft-bodied insects cluster on the leaves and developing buds. This is usually a sign of stress. Hope that helps! The main cause of unsightly foliage or a lack of flowers is fungi. (Washing with insecticidal soap is useful for killing many types of insects). If you want even more information about Rhododendron pests and problems, this guide from Washington State University has an extensive list of Rhododendron problems and how to fix them. It just hits certain plants and does it just about every year. In this case, you may want to take the Rhododendron out to prevent the disease from spreading. Slow, stunted growth. Indian Hawthorn. Move it if necessary (sun for half the day or dappled light is best) and get a blanket of mulch over the roots. How can I tell and what can I do to save it? If you can’t scrape it off, it is more likely to be one of the Rhododendron diseases that will eventually kill the plant. The vast majority of Rhododendron species are native to the eastern Himalaya and southeast Tibet, along with the islands of Java, Sumatra, Borneo, New Guinea, and the Philippines. Here’s how to help: Whenever the temperature gets above freezing, give your rhododendron a slow and steady trickle of water until the soil feels damp 8-10 inches down. This is mainly cosmetic but if it keeps happening you may need to move a plant to a more sheltered site or cover it up in frosty weather. That would be a heck of a lot of sub zero winter temperatures, which could do the winter kill. Leaves yellow and/or develop dark purple tone. What is that? 3. I have used rhoddie fertilizer, iron supplements, and water. Meanwhile, I have found a webpage where a picture of very similar leaves could be found under'6. I wouldn't worry about it. In my case I think it is the heat of summer hitting the new spring growth before it hardens off. the leaves are also becoming a lighter green…. Here are some common pests affecting this shrub: Spider mites – Spider mites feed off of bud and leaf sap, leaving leaves yellow or bronzed. Analysis . Thank you for any help you can give me. 2. Rhodies are picky about the soil you plant them in and about how much water they like. Hi Darlene…If you can scrape the black off, that is usually sooty mold which grows on the honeydew left behind by certain insects like aphids, whiteflies and scale. You could try adding some Rhododendron fertilizer to see if that helps. If you wish to share our content, please click here to see our conditions. While most Rhododendrons will do fine in the shade, there are some varieties that like more sun. For insects use a contact or systemic insecticide. What side of the plant is that? These are the 2 common causes of this that I’ve seen. You do not want to promote tender growth that will freeze out. If there is a nursery in your area that does plant testing, they can tell you for sure what it is. I thought this was ok, but one of the main leaves started to cave in. There's a huge variety of colours - pinks, purples, yellows, reds - all sorts. I would cut back the dead branches, make sure it is mulched well and that it is getting enough water. The leaves of the smaller azalea are usually pointed and narrow; the leaves of the rhododendron are generally large and leathery. One possibility is Exobasidium Leaf and Flower Gall, Exobasidium vaccinii which is a very common fungal disease in the spring during wet, humid, cooler weather on azaleas and occasionally on rhododendrons. For this last one, you can try sprinkling soil acidifier around them to see if it helps. Big Leaved Species with their massive leaves up to 75cm long, grow in conifer forests around 3000metres. It had more last year but was still thin I wanted to prune, but was afraid to without knowing what I was doing. Although the brown spots don’t look great, they don’t seem to bother the plant much. Remove each faded rhododendron blossom from the shrub promptly upon wilting. Hi … I live in New England, and my usually healthy Rhododendrons have now developed light-colored growths (about the size of ping-pong balls) of what looks like a a mushroom-type fungus/growth? On deciduous azaleas, white powdery fungus grows over the upper leaf surface. If your plant is already ill, the added stress of an infestation may kill it. To correct this problem, you’ll need to dig up the plant and raise it. The bush could be planted too deep. Do not put them in the compost bin, and do not leave them lying around on the ground, lest the fungus spread to other branches. Rhododendron Problems: What’s Wrong With My Rhododendron? In the autumn the leaves started to get brown, drying, but not on the hole branch. A third possibility is Thrips, Thrips imaginis. 2. I have a Lavender Rhododendron that grew at a normal pace over the last Ten years. It is thought to be spread by the Rhododendron Leaf Hopper, an insect that doesn’t do much damage to the plant other than spreading this fungus around. Fertilizer probably isn’t a good idea. Only one major chore but a plethora of planting possibilities means a delightful month in California gardens, Get the look of this modern foundation planting by focusing on a restrained color palette with tasteful accents, Great Design Plant: Rhododendron Canescens, Have Acidic Soil in Your Yard? They are in a row in front of my home. Last summer was one of the hottest in history and many of my rhododendrons showed some sun-burn damage on the south-western side, but only this one had its leaves become so small and deformed as well. In this case, they usually turn a light brown color and get a little mushy (for lack of a better term). First, take a look at how well your soil drains. In which case, you may want to cut some of them back to allow good air circulation. It is at least 25 years old and has had little to no care over the last decade. You can find more about caring for your Rhododendrons HERE, this guide from Washington State University has an extensive list of Rhododendron problems and how to fix them, 7 Of The Best Azalea and Rhododendron Varieties, How To Design A Stunning Shade Garden (With Pictures), https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azalea-leaf-gall.htm. Do you know my problem. You can download it for free, or buy a printed copy. Relocating them could be a possibility if there is a more protected location for them. The flowers have been “okay” on three of the bushes, although not full, and the 4th one is not growing and is scrawny with few buds each year! There may be two additional generations yearly corresponding with flushes of rhododendron growth. Of the few rhododendron insect problems that exist, most can be handled first through prevention or subsequent treatment with neem oil. They have dropped several green leaves over the last two weeks without any indication that there is any other problem. I will correct the problem with sun exposure this summer, but I thought there might be more to it than just sun burn. The body margin is ringed with white wax filaments, with the last pair over 1/2 the length of the body. Spray the leaves and stem of your rhododendron plant with insecticides. I appreciate any help on what this condition might indicate and on instructions how to cure it. Your advice would be appreciated. It is mostly in the shade. The old leaves started to soften up and die away, but after putting it out in the sun This started progressing much faster. Hi Marianne…There could be a few reasons why your Rhododendron is not flowering and leaves are turning light green (or even yellow). My plants have coal black stems. Some immature ladybird beetles may resemble the mealybugs, but move faster. Poor drainage. Failure to follow the listed instructions can lead to serious illness or even death. I have had rhododendrons in front of my house in the middle of the yard for ten years, each year they have not grown very well. So there is a chance that your tough rhododendron may recover. Should I prune it all back or is there a fertilizer to help it come back? I don’t want to cut it back or down if I don’t have to. The most probable cause is high heat (direct sun) hitting this side of the plant. Hope that helps! Have some leaves falling and a few dead branches at the bottom of the plant. (Since you had another one die recently in the same area, it could also be some kind disease, in which case, there’s probably not much you can do). A second type of Rhododendron issue is brown spots on the leaves. It looks like it’s dying but it didn’t happen till after blossoming. Flower buds may be deformed, and the leaves often have curled edges. 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 we’ve learned through our combined 75+ years of experience. I just fertilize it and it seems that it has flowers. Good luck with them! So even though I mentioned all kinds of possibilities, I personally don't think it is a significant problem. If you do a search on Amazon.com for Rhododendron fertilizer, you’ll see a few different options come up. Or 3. Ants feed on the honeydew secreted by the mealybugs and protect them from parasites and predators. Rhododendron specific fertiliser in late spring after flower finishes and just before new growth starts. what should I do? The plants are not dead but are small not even 3 ft tall. What can be done about dropping leaves after blooming? The Rhododendron on the property I took over last year is struggling and has very few leaves this year. I am in Woodbury Connecticut and I have seen this happen to other, larger Rhododendron close to me. Coupez également le bois mort. Most common cause is a sucking insect such as aphids or lacebug feeding under the leaves when the foliage is young. I also wanted to see the flowers as there were lots of buds. Hello My Rhodedendrons have spots. This season it did produce leaves and the ones that are left are turning brown and falling off. Also, avoid fertilizers with too much nitrogen since it promotes lots of leaf growth without blooms. Pruning them should only occur in spring, immediately following them blooming. Hi. If a lot of cold wind blows past your rhododendron in the winter, it will curl its leaves inward so less leaf surface is exposed; the plant’s trying to keep water from evaporating out of its leaves. Have a damp, shady spot in your garden that needs a lift? Hi, I have a rhode whose leaves are yellow, droopy, and the bush basically looks like it is dying. Hi Terry…That’s a lot of Rhododendrons. Hi Suzanne…I haven’t experienced those myself, but it sounds like it could be a fungus called Azalea Leaf Gall. Rhododendron species (azalea, rhododendron, rosebay) contain grayanotoxin glycosides, which affect sodium channels in cell membranes, leading to neurologic, gastrointestinal, and cardiovascular dysfunction (Figures 31-5 and 31-6). A shiny or sticky substance usually coats the leaves. This year the leaves gradually turned brown. Bear in mind that for 11 months of the year you have only the leaves to enjoy. One potential Rhododendron problem is that the leaves are turning yellow. It looks as though it is dead? The leaves always stayed greeni, although curled in the winter. Rhododendrons originate mainly from the Himalayas where about 600 different Rhododendron species can be found. Thank you. Terminal leaves may become yellow and distorted, and dieback may occur. It looks really bad this spring, almost dead-looking, with just leaves on top. Since then this had become more obvious and had probably spread to neighbouring branches. I think you did more harm than good covering it up last winter. 1) Frost burn OR2) Aphid damage OR3) Summer heat on new growth. I hasn't spread to any other plants and doesn't get any worse. Thank you for commenting back. Rhododendrons don’t like to get dried out. I have been taught in seminars that there are some insect grubs that can cause the leaves to … And make sure it is getting enough water. Blossoms will be pink or white. 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. If none of those seem to be the case, you may just have a short-lived plant. But fortunately, it usually doesn’t cause any lasting damage either. It always recovered from dormancy. Tiny, semicircular holes appear at the edge of the leaves. The state flower of Washington is the Pacific rhododendron, R. macrophyllum, which means “rose tree with large leaves.” Rhododendron macrophyllum grows in the wild from British Columbia, Canada to central coastal California. I don't think you let it have the proper dormancy it needed in the winter. 1. Pour cela, coupez-les en fin d'été, et au-dessus d'un œil (bourgeon dormant) pour favoriser la ramification. Eggs are laid in clusters on the undersurfaces of leaves that are emerging from buds. All you can do is see what happens next spring. I am now quite sure that the problem appeared during a critical stage of new growth (leaf) formation and affected only selected branches of the rhodie. Sometimes rhododendron leaves will bear the marks of insect feeding. It’s seemed just fine until I put it out in the sun for a couple days, and I think it got cooked. It is still alive due to the healthy looking green on it. Powdery mildew: On evergreen rhododendrons, actual growth of the fungus on the lower leaf surface can be hard to detect, but infection tends to cause pale green, reddish-purple or yellowish patches on the upper surface. I found this article that has pictures and some suggestions on how to treat it. The new shoots are very healthy. Il est possible de couper les branches si leur disposition nuit à l'esthétique du rhododendron. 7. It grows on the honeydew left by insects like aphids and white flies. The leaves are spirally arranged; leaf size can range from 1–2 cm (0.4–0.8 in) to over 50 cm (20 in), exceptionally 100 cm (40 in) in R. sinogrande. Surprisingly, the symptoms are different for rhodies than for many plants. Also, you’ll want to do it soon since this is the best time of year to fertilize Rhododendrons. First, since the Rhododendron roots are so shallow, too much fertilizer can stunt the growth of the whole plant. They are small, the leaves look kind of wilted and yellowish. Sometimes you notice a few dead branches, yellow or dried out leaves and wonder if the rhododendron … I am worried this could be some sort of disease that might spread to the whole plant and kill it if I do not treat it. I have tried to research them, but can find nothing about them. Wash the leaves with insecticidal soap to get rid of the insects and the black stuff should go away. It must be beautiful in the spring with all of the flowers! Hope that helps! This List of Rhododendron species includes species of the genus Rhododendron, which is in the plant family Ericaceae.Depending on the source, there are anywhere from 800 to over 1,100 wild species. This Southern U.S. native may be the solution, Look to acid-loving plants, like conifers and rhododendrons, to help your low-pH garden thrive, Sword-shaped leaves make this fern a stunning accent — and you can even mount it on wood for a wall hanging, Use bold, large-leaved plants to create intriguing contrast in a garden where they’re least expected, When the world is getting on your last nerve, an outdoor refuge can soothe and nurture. Chlorosis is a disease characterized by yellowing of rhododendron leaves. There's even a fragrant one, Rhododendron 'Fragrantissimum' - spectacular." my rhododendrons bush only has a few flowers that have bloom we have had a very wet cool spring so far what can I do the buds look fine. Clip the blossoms from the stems with the pruning shears just above the point where a cluster of leaves grows beneath the blossom. 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. Rhododendrons are a beauty in the yard with their bright bold clusters of flowers in the spring. Has this ever happened to you? Since it is hard to see, systemic insecticides are preferred, but thorough treatment with a contact insecticide may provide control. rhodyman, thank you for the exhaustive analysis on possible causes of the distorted leaves on my Goldbukett. And you do not fertilize in the fall. Or has the soil built up over the roots (or anything else on top of the roots that wasn’t there before)? Second, fertilizer applied after the plant has finished blooming mostly promotes lots of leaves…so if you are going to fertilize, be sure to apply it at the correct time. You can get insecticides to kill the bugs, but I prefer to just pick off the infected blooms as soon as I see them (less detrimental to the environment). (You can find more about caring for your Rhododendrons HERE). Rhododendron roots are very fine and close to the surface, if you apply any kind of fertiliser on top of these fine roots the effect can be drastic. There are no effective specific biological controls and thus control can be difficult to achieve. Over 8 foot wide. Hi Janet…I would try one of the fertilizers that are made specifically for Rhododendrons. Last summer was one of the hottest in history and many of my rhododendrons showed some sun-burn damage on the south-western side, but only this one had its leaves become so small and deformed as well. Water immediately! Learn to Love Gardening Anyway, Get a Tropical Splash With a Bird's Nest Fern, Smell This Shocking Flower at Your Own Risk, Great Garden Combo: Silver Sparkles Amid Purple and Blue Foliage. We’ve had a wet spring, but other rhododendrons, planted in similar conditions but about 50′ away, are not dropping leaves. But in some cases (like Phytophora root rot), it is best just to take the plant out. These micronutrients include iron, manganese, and zinc. It usually attacks plants that are under stress due to drought, too much sun or late frosts. Many diseases and other problems can be prevented by following the recommended cultural practices for proper planting and care. Any ideas? it is now about 8 feet tall and bloomed beautifully every year. That decreases the number of fungus spores that are available to be transported and limits the spread of the issue. 2. Thanks. As for the Long-tailed Mealybug, no honeydew or sooty mold has appeared on the leaves. But I have had Rhododendrons die back and then send up new shoots from the ground so watch for that. Some notable exceptions include many azaleas as well as 'Purple Splendor' and 'Vulcans Flame'. If the mealybug problem persists, ant control may be necessary. There is nothing more disappointing than seeing your Rhododendron covered in buds and then not getting any flowers! Happily many rhododendrons have outstanding foliage and Glendoick have specialised in raising plants with outstanding foliage effects. Immature mealybugs have short wax filaments. Hi Nancy…that often happens if the plant is under stress due to extreme temperatures (hot or cold) or lack of water. To fix this, try adding a Rhododendron fertilizer following the directions on the box for how much / when to apply (Rhododendrons don’t like to be fertilized too much). Unless you are trying to grow Rhododendrons that aren’t zoned for your area…then you might want to look for some other varieties that won’t be affected so much by the cold. With the humid summers here in SC, I always seem to have at least one Rhododendron with this problem. Ants may be present. The leaves look okay on all of them, but they don’t have the fullness I’ve seen on other bushes in the neighborhood. Your email address will not be published. May be a simple as the plant hasn't yet rooted into the surrounding soil. Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. Each species of rhododendron has a different leaf shape, coloring, texture and size. Since you are still getting blooms, it sounds like that isn’t too much of an issue. Generally speaking, Rhododendrons are very care-free plants that don’t require much maintenance at all. According to the Clemson University Cooperative Extension, this is caused by another kind of fungus that gets under the bark. Wonder if I should prune above them, maybe the new growth that will come out will not develop the same defeormed leaves. Hi Carl…The dropping leaves can be a sign of too much water. Is there a special fertilizer I should use to encourage their growth and blooms? Here is a link that might be useful: NON-DISEASE PROBLEMS, "Aphids wlll cause the same deformed appearance, as can high heat during critical cell development stage.". Hi Larissa…I don’t have a lot of experience telling the difference between the Rhododendron diseases, but I found this article that does a pretty good job of explaining them, how to tell the difference between them and what to do about it. Slow, stunted growth Remedy: Fertilise with Butlers Azalea, Camellia and Rhododendron food in late spring after flower finishes and just before new growth starts . The most common cause of not having any blooms is that the plant was pruned after flowering the previous year, or too much of the flower head was removed when deadheading. Larvae mature in about seven days, drop to the ground, burrow in and make a cocoon. The shrub gets through the winter quite well and comes back every year; it also handles replanting very well. However, if your Rhododendrons have lichens growing on them, it usually means they are thinning because of poor growing conditions, disease or old age. Le rhododendron ne nécessite pas de taille. I have a rhododendron bush that budded up last year (I live in south east England)… but has not flowered this year …. Rhododendrons don’t like wet roots so if the location it is in doesn’t drain very well, you may need to move it to a better spot (or fix the drainage issue). My rhoddie is about 15 years old. Toutefois, coupez les fleurs fanées après la floraison, en les pinçant entre le pouce et l'index. The underside of leaves may be covered with excreta of the insect, which are like brown tar droplets. If you have a late frost, it’s possible that the buds on your Rhododendrons were affected. Are there other plants that have gotten bigger and may be interfering with the Rhododendron’s roots or causing it to get too much shade? They should tell you on the package how much to apply, but generally it’s not a lot. The roots are very thick but don’t appear dead. Some plants get touched by mildew and lichen. I have seen this on plants that have become too crowded or are lacking in Magnesium (those yellow leaves from above). But then, much to my surprise, it started to grow some brand new shoots from the bottom. I have decided to wait and see. But WV isn't usually that cold. Has the drainage changed so it’s getting too much water? It has strong growth and flowers prolifically. Others, from the Himalayas, have huge leaves. It is possible that the cold and snow finally took its toll (especially since it seems to be affecting other Rhododendrons in your area). The most common cause is that there is a nutrient imbalance in your soil. Hi Sharon…yellow leaves usually mean that the Rhododendron is unhappy with the soil – either it’s getting too much or too little water, or the soil isn’t acidic enough. Hopefully you’ll get a new set of leaves growing after the flowers are finished. This insect is a seasonal pest, causing most damage in mid to late summer. We have had several years that the winter’s were much colder, more snow, the works. Lichens are a combination of algae and fungus forming a partnership to help each other grow. And almost all of them will produce more blooms if they get dappled shade, rather than total shade. My question is that it is now shooting from the base. Azaleas and hydrangea bloom on wood produced the previous year. Do you have a clue? Some varieties prefer a much colder winter than we have and these tend to burn and crisp on the leaves. Move the plant to a more sheltered position, increase watering and mulch around the shrub. These shrubs prefer climates with adequate rainfall and moist summers. Other than covering the plant during the frost, there isn’t much you can do about this condition. Here a link to three pictures of the rhododendron in question. The leaf gall fungus, Exobasidium vaccinii, distorts the shape of rhododendron leaves so that they curl backward rather than downward, as in the case of curling caused by weather. So I thought I would share my experiences in case you run into the same problems and need some help. please help identify shrub greenish, red leaves possible bloom? So hopefully that helps. Hi Mary…the wet cool spring shouldn’t prevent the Rhododendrons from flowering unless the soil they are planted in doesn’t drain very well. The wrinkled, deformed new growth can be caused by a freeze just the leaves begin to develop. Symptoms: Decline in vigour and leaves … Should I do something else or what can be the cause? Let me know if you believe this could be the actual cause.In any case I will follow your advise and wait and see if the situation worsens. One potential Rhododendron problem is that the leaves are turning yellow. 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