Hearts to all the MGs! I've also included the seemingly healthy undersides of the new growth. Many animal poisonings happen in the early spring and late … The new growth is slightly curled (see attached 2) but shows on particular damage. I´d like to know the answer to that as well as I have the same problem...so now we will wait until somebody with knowledge of Rhododendrons helps us. I've included two close images of the tiny structures that seem to be exuding the sticky, resin stuff (it does not wash off easily, similar to sap). Are you able to take a photo of the underside of the leaves in the second photograph? Kristena,Thanks so much for you quick reply. I cannot find evidence of spider mites or aphids. I think I have an answer for you. Bud blast spoils developing flower buds, … I'm also wondering that if they are new leaves rather than flowers, are you pruning/dead heading. Record the plants in your garden, share your photos, and make like-minded friends. Add another photo. The phenols are present in more concentrated amounts in younger rhododendron tissues, before they toughen up. The production of these is basically a defense mechanism by the plant against being consumed by herbivores such as grazing animals. Rhododendron bud Blast is a fungal disease of Rhododendrons and Azaleas, affecting the tight dormant flower buds. Thanks. Scale Insect on rhododendrons and camellias. In this case, they usually turn a light brown color and get a little mushy (for lack of a better term). There is a rust which causes leaves to roll under, and damage is apparent on leaf underside. If your plant set buds, but didn’t bloom, the buds were probably frost-nipped or destroyed by cold, drying winds. cant say for sure but i had this problem a few years ago i put i down to the very wet weather damaging the outer bud petels and sort of sticking the whole bud in a sticky mess..as i said thats what i thought had caused it but if any brighter spark knows for sure let us know. Like many plants in the landscape, rhododendrons have very specific needs that must be met before they will bloom freely. The substance is not sweet and has a faintly resinous odor. These are described as small hairs, or glandular scales. It's quite messy. )In summary, " The trichomes present on lepidote rhododendrons are also glandular in function: besides being scaly, these structures produce essential oils that deter feeding by adult black vine weevils." The old growth suggests azalea lace bug infestation (see attached 3). I took the notion to dead head a couple of Rhododendrons a few years back and inadvertently caused the plants to produce very few flowers the following year. A shiny or sticky substance usually … "So, far from being something on your rhodies that should be eliminated, it is both a part of the plant's DNA as well as being protective. There is a type of rhododendron known as "lepidote" rhodendrons that have trichromes on them. The substance is not sweet and has a faintly resinous odor. Rhododendron Insect Problems. A cup of vinegar to a gallon of tap water will do the trick. I am trying to remove any hatchlings with strong water sprays once a week. The disease if more noticeable in the spring, when buds will be dark brown and normally … Of the few rhododendron insect problems that exist, most can be handled first through prevention or subsequent treatment with neem oil. Rhododendron sticky exudate. Are you sure they are flower buds and not new foliage forming. I have a large rhododendron that has a copious amount of sticky, red exudate on the stems and leaves (see attached 1). IS THIS A PROTECTIVE substance or evidence of some pest? How much can I cut back on hellebores, to free up space for summer plants. MANY THANKS!!!!!!! I'm continuing to look! Hi, welcome to GoY, it sounds like Rhododendron bud blast, believed to be caused by the rhododendron leaf hopper, it's a fungal disease, which enters the plant when the adult leaf hopper lays eggs in late summer in next years flower buds, there are several treatments, one of which is bayer sprayay greenfly killer, just follow the instructions on the package, Derek. It is active on rhododendrons from late spring to autumn but is most noticeable when the brightly coloured bluish-green adults are present in late July-October. Thank you for your question about your rhododendron. Many animal poisonings happen in … The small scale insects 1mm wide are like translucent circles stuck … This looks very much like your image, except for the reddish brown coloring.Thanks, again! 'Tis a puzzle--but an intriguing one! Thanks. Thanks so much for the photos. Yea! Don't remove the leaves. Problem Info. I cannot find evidence of spider mites or aphids. My Cooking Apple trees (2) have very little blossom, one more than the other, they... », Add a photo « How much can I cut back on hellebores, to free up space for summer plants. The toxicity comes from free phenols and diterpenes, also known as grayanotoxins, in the plant tissues. Your hands will get sticky from this task but you can clean them with an oil-based hand cleaner. Flower buds may be deformed, and the leaves often have curled edges. The growth can and does look similar. 3. In other words, they look like they’re been frozen and thawed. Sid . Derekm. !) I'll keep exploring! How long have you had the plants? I'm comforted by the answer, though I'll be careful to not plant any new lepidote rhodies! We both recognize the effects of last year's azalea lace bug, and that can't be changed. (This study related to black vine weevils, a pervasive and serious pest of rhododendrons. The sticky sap that comes from young rhododendron buds is full of these toxic compounds and can irritate skin and eyes. Rhododendron leaves contain a toxic coating, and many rhododendron varieties contain a sticky coating that will quickly cover your hands as you work with the shrub. The aphids might be on a plant … 21 May, 2010; Answers. Might be honey dew (bug poo!!) Ask an Expert is made up of groups and individual experts. A good reason why you see no vine weevil notching on the leaves!Now, as for your leaf curling issue, which appears to be minor. Symptoms: Look for sticky black secretions on the upper surface. They are spread by water and potentially infect buds through wounds made by the rhododendron leafhopper when it punctures the bud to lay its eggs (although some recent research has cast a doubt on this link between the pest and disease).

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