Here are some common pests affecting this shrub: Spider mites – Spider mites feed off of bud and leaf sap, leaving leaves yellow or bronzed. Hope that helps! The Rhododendron on the property I took over last year is struggling and has very few leaves this year. In other words, they look like they’re been frozen and thawed. If none of those seem to be the case, you may just have a short-lived plant. When the leaves all start dying, it usually indicates one of the Rhododendron diseases that can’t be cured. When scraped they are bloody. Applying some peat moss and acidic mulching materials around the plant will eventually help to bring the soil pH down. In this case, you can wipe the mold off, but will need to get rid of the insects to prevent it from coming back. Move it if necessary (sun for half the day or dappled light is best) and get a blanket of mulch over the roots. Any ideas? Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. 3. Sometimes you notice a few dead branches, yellow or dried out leaves and wonder if the rhododendron … Hi Gary…it sounds like you have a happy Rhododendron! Since the buds grow during the summer, making sure that you have a thick mulch cover and that your Rhododendrons are getting at least 1″ of water per week will help it to be as healthy as it can be. I have a Lavender Rhododendron that grew at a normal pace over the last Ten years. Pour cela, coupez-les en fin d'été, et au-dessus d'un œil (bourgeon dormant) pour favoriser la ramification. I’m worried the plant is feeding too much energy into the new shoots. I also wanted to see the flowers as there were lots of buds. So there is a chance that your tough rhododendron may recover. It looks like it’s dying but it didn’t happen till after blossoming. If the bark itself has actually turned black, that is probably not a good sign. That decreases the number of fungus spores that are available to be transported and limits the spread of the issue. Adult mealybugs are about 1/8 inch long, and covered with white wax. Infested plants will have honeydew and sooty mold (black coating) on the leaves. Hi Julia…I would first check to see if there are any growing conditions that have changed over time and need to be fixed. The leaves look okay on all of them, but they don’t have the fullness I’ve seen on other bushes in the neighborhood. While most Rhododendrons will do fine in the shade, there are some varieties that like more sun. So I would wait for a few weeks and see if it starts to put out new leaves. This is usually a sign of stress. The alkalinity prevents the plant from taking in the iron that it needs to remain healthy. For this last one, you can try sprinkling soil acidifier around them to see if it helps. 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. Some immature ladybird beetles may resemble the mealybugs, but move faster. But in some cases (like Phytophora root rot), it is best just to take the plant out. The deformed leaves are on the western side of the plant. The above picture of a Rhododendron showing its nice red-purple fall color. That would be a heck of a lot of sub zero winter temperatures, which could do the winter kill. Do not put any thing on or over the plant itself. The Rhododendrons are planted too deep (the root ball should be very close to the soil line). Some plants get touched by mildew and lichen. Thanks. 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. It isn’t a life-threatening condition for the plant, but it is really disappointing for the gardener! Another is Long-tailed Mealybug, Pseudococcus longispinus which creates small cottony masses with long, waxy filaments extending from one end is a symptom of the long-tailed mealybug, Pseudococcus longispinus, which is a sucking insect that colonizes on the least accessible parts of plants. If that’s the case, you can try to improve the drainage in the area. Don’t be alarmed. The first sign is that the leaves will go brown and crusty and look like they have been sunburnt. Has the drainage changed so it’s getting too much water? 2. I wouldn't worry about it. Should I cut the new shoots off or leave them on to regenerate the plant if the older growth has future problems. If you wish to share our content, please click here to see our conditions. Hi Suzanne…I haven’t experienced those myself, but it sounds like it could be a fungus called Azalea Leaf Gall. And almost all of them will produce more blooms if they get dappled shade, rather than total shade. Reading your post I think that it can be the lack of water and the shade that is present almost all morning on our balcony. 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.". So even though I mentioned all kinds of possibilities, I personally don't think it is a significant problem. Azaleas and hydrangea bloom on wood produced the previous year. In another year you shouldn't even notice it whether you prune or not unless it does it again. This insect is a seasonal pest, causing most damage in mid to late summer. Hi there My rhododendron is over 30 years old. Is anyone growing Anah Kruschke Rhodo in the Mid-Atlantic. 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. Have some leaves falling and a few dead branches at the bottom of the plant. I forgot to say that I have several plants that have a couple branches like this most years and I do nothing. These micronutrients include iron, manganese, and zinc. Rhododendrons are a beauty in the yard with their bright bold clusters of flowers in the spring. Bud Blast is a fungal infection that causes the buds on the Rhododendron to die and turn black before they bloom. All you can do is see what happens next spring. Others, from the Himalayas, have huge leaves. Since you’ve had a wetter spring than usual, they will likely recover when the soil dries out. Frost burn on new growth'.I have attachged a link to the page. Hi, and welcome! In this case, you’ll just have to wait it out until next year…and remember not to cut off the flowering stems . Rhododendron is a genus of shrubs and small to (rarely) large trees, the smallest species growing to 10–100 cm (4–40 in) tall, and the largest, R. protistum var. Rhododendrons like lots of water, but they don’t like the soil to be soggy. 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. It always recovered from dormancy. Sun Burn: Leaves yellow and/or develop dark purple tone. Or west? Ants feed on the honeydew secreted by the mealybugs and protect them from parasites and predators. Does it need fertilizer? It is mostly in the shade. I am in Shelton CT. Any suggestions??? The leaves always stayed greeni, although curled in the winter. Hi John…I’m assuming since the plant has been growing successfully for a few years that you don’t have an issue with poor drainage or alkaline soil. © 2020 Gardening @ From House To Home - WordPress Theme by Kadence WP. Leaves yellow and/or develop dark purple tone. Notify me via e-mail if anyone answers my comment. Again, there are a number of reasons why you don’t have any buds on your Rhododendrons. Chlorosis is a disease characterized by yellowing of rhododendron leaves. I will correct the problem with sun exposure this summer, but I thought there might be more to it than just sun burn. For insects use a contact or systemic insecticide. However, I could easily notice on the stems underneath the damaged leaves very healthy looking dormand buds. It is possible that the cold and snow finally took its toll (especially since it seems to be affecting other Rhododendrons in your area). It grows on the honeydew left by insects like aphids and white flies. I will look carfully for eggs of the Rhododendron Gall Midge when new growth appears to see if this might be the cause. what should I do? One potential Rhododendron problem is that the leaves are turning yellow. Do you know my problem. Ants may be present. The shrub gets through the winter quite well and comes back every year; it also handles replanting very well. Tiny, green or pink, soft-bodied insects cluster on the leaves and developing buds. 1) Frost burn OR2) Aphid damage OR3) Summer heat on new growth. I haven’t personally experienced that problem, but from your description it sounds like it could be Azalea Bark Scale. Larval feeding causes a downward and inward rolling of leaf margins. Over 8 foot wide. This year it has bloomed nicely, but the lack of leaves make it look sickly. But WV isn't usually that cold. The old leaves started to soften up and die away, but after putting it out in the sun This started progressing much faster. 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. 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. It usually means your plant has a disease such as Botryosphaeria canker or Phytophora root rot. I am worried the plant, being old, will eventually die off of old age. The new shoots are very healthy. Analysis . I’m Wanda and I believe that anyone can create a relaxing garden retreat in their city backyard…no matter the size. At least a dozen have little white pods all over the stems and crotches of the plant. One potential Rhododendron problem is that the leaves are turning yellow. Thank you. The most distinctive feeding pattern is that left by the snout of the black vine weevil, Otiorhynchus sulcatus. A fourth possibility is Rhododendron Gall Midge, Clinodiplosis rhododendri. 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. The underside of leaves may be covered with excreta of the insect, which are like brown tar droplets. Good luck with them! 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. I have four rhododendron bushes which were planted about four years ago. 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? Symptoms: Leaves yellow and/or develop dark purple tone. I found this article that has pictures and some suggestions on how to treat it. I have used rhoddie fertilizer, iron supplements, and water. But then, much to my surprise, it started to grow some brand new shoots from the bottom. There are two to three generations a year, and the immatures over-winter on the bark. 18 Grayanotoxins are found in all parts of the plant, including the flowers and nectar, and as few as two leaves may cause serious poisonings. Caused by Sap-suking insect (aphids). There's even a fragrant one, Rhododendron 'Fragrantissimum' - spectacular." The soil isn’t acidic enough. These nocturnal feeders leave behind evidence which looks like someone has run amok with a paper punch. In the autumn the leaves started to get brown, drying, but not on the hole branch. Since then this had become more obvious and had probably spread to neighbouring branches. The leaves of the smaller azalea are usually pointed and narrow; the leaves of the rhododendron are generally large and leathery. Will eventually die off of old age wind block around it for the plant Rhododendron grew! 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