Thanks. There are others on site with far more knowledge than me so I'd be interested to know what they think. I cannot find evidence of spider mites or aphids. I'll keep exploring! My Cooking Apple trees (2) have very little blossom, one more than the other, they... », Add a photo Don't remove the leaves. Problem Info. 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. If your plant set buds, but didn’t bloom, the buds were probably frost-nipped or destroyed by cold, drying winds. MANY THANKS!!!!!!! If you have a late frost, it’s possible that the buds on your Rhododendrons were affected. 'Tis a puzzle--but an intriguing one! These oils are what you described as resin or "nasty dew. The aphids might be on a plant … Asked May 19, 2017, 3:52 PM EDT!) The substance is not sweet and has a faintly resinous odor. IS THIS A PROTECTIVE substance or evidence of some pest? Rhododendron Insect Problems. Feeding will begin in a week--blooms are almost to a (messy) end. The phenols are present in more concentrated amounts in younger rhododendron tissues, before they toughen up. There is a rust which causes leaves to roll under, and damage is apparent on leaf underside. Your hands will get sticky from this task but you can clean them with an oil-based hand cleaner. Kristena,Thanks so much for you quick reply. 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. (I've attached a picture just to illustrate how similar they are.) )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." There is a type of rhododendron known as "lepidote" rhodendrons that have trichromes on them. My rhododendron produces buds but although they have fully formed flowers within they don't open....why? Ask an Expert is made up of groups and individual experts. Bud blast spoils developing flower buds, … Might be honey dew (bug poo!!) Bud blast: the fungus causing bud blast produces its spores on the black fungal 'bristles' that appear on infected buds. Rhododendron bud Blast is a fungal disease of Rhododendrons and Azaleas, affecting the tight dormant flower buds. According to this study, "Results suggest that the glandular scales of the lepidote rhododendrons function, at least in part, in plant defense against insects." Is there another problem that might cause the old growth to look like this? Snap it off, being careful not to damage the new buds forming on the sides of the stem. 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. I think I have an answer for you. « How much can I cut back on hellebores, to free up space for summer plants. I direct your attention to page 8 of this article on leaf curl in rhododendrons, and suggest you follow their testing and remedial recommendations.Thanks for an interesting question! Are you able to take a photo of the underside of the leaves in the second photograph? The only remarkable thing I can see is the shadow of the tiny spines with the nasty "dew". Rhododendron sticky exudate. 21 May, 2010; Answers. Thanks so much for the photos. Flower buds may be deformed, and the leaves often have curled edges. In other words, they look like they’re been frozen and thawed. I have a large rhododendron that has a copious amount of sticky, red exudate on the stems and leaves (see attached 1). A shiny or sticky substance usually … 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. Record the plants in your garden, share your photos, and make like-minded friends. Add another photo … This looks very much like your image, except for the reddish brown coloring.Thanks, again! 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). 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. Are you sure they are flower buds and not new foliage forming. !) 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. Give your rhododendrons, azaleas, hydrangeas, and your garden a little help by watering them with a white distilled vinegar solution now and then. A cup of vinegar to a gallon of tap water will do the trick. Tiny, green or pink, soft-bodied insects cluster on the leaves and developing buds.

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