are rhododendrons poisonous to bees

2 Botanists from Trinity College Dublin's School of Natural Sciences have discovered that the nectar from a common, non-native plant, is toxic to some Irish bees. I feel bad about throwing these, otherwise healthy, trees in the bin but all my friends are bee keepers too so they won’t appreciate such a ‘present’. Azalea and Rhododendron: Toxic Principle: Andromedotoxins (grayanotoxins) are water-soluble diterpenoid compounds. I’ve also, more than once, found bees landing in the grass about 50 cm in front of hives affected this way as if bees are having troubles finding home. It can poison many species, from humans to horses, birds and insects that ingest it. Whole Plant Traits: Plant Type: Poisonous On thing’s for sure, no rhododendrons here. In contrast the nectar has no apparent effect on worker buff-tailed bumblebees. The toxins responsible for the poisonous effects of Rhododendron are grayanotoxins. These are highly oxygentated diterpenoids that have been presumed to be produced elsewhere in the plant as a natural chemical defence against insects. The problem is only observable in the time gap from about 1 hour after dawn to mid day where the bees have pushed the dead bees out of the hive but not removed them from the immediate area in front of the entrance. In buckeye poisoning it is the brood or young bees rather than the adult bees that are affected. Stories tell of soldiers finding rhododendron honey left by fleeing citizens. The deaths start slowly (tens, not hundreds), build in number of deaths and colonies affected, go away, come back and the whole drama takes about a month to finish doing its damage. Common rhododendron is regarded as an unwelcome alien invader and being eradicated from Nature Reserves here in North Wales, so not a good hunting ground for ‘mad honey’ here! Hi Mel, sorry to hear that. Pontic rhododendron (Rhododendron ponticum): Native to southwest Asia and southern Europe, this shrub is widely planted … I can’t help but wonder how common this kind of thing is but perhaps not noticed by beekeepers. It’s common practice for beekeepers to keep their hives closed until the flowering season is over. The effects rarely prove fatal to humans but probably would have halted or slowed down armies for a while. I never really noticed bee activity on Rhododendron, but will now. Without the coreflex I don’t think we’d notice the problem and just assume normal end-of-season population drop. Chemicals in rhododendron leaves, flowers and nectar make the plant toxic. http://www.countryfile.com/countryside/top-ten-plants-are-bad-bees?fb_action_ids=10208750000685917&a... http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c163, https://www.sciencedaily.com/releases/2014/12/141211210006.htm. In a separate part of the book it mentions….. ‘buckeye poisoning ‘ troublesome to Beekeepers in the southern United States. Consumption of the plant or any of its secondary products, including mad honey, can cause a rare poisonous reaction called grayanotoxin poisoning, mad honey disease, honey intoxication, or rhododendron poisoning. R.ponticum was introduced to Ireland in the 18th century and has invaded large areas of the countryside, where it is regarded as a pest. There are three categories of plants that are associated with toxic honey: 1) plants whose nectar or pollen kills bees before they can transform it into honey (e.g. Nectar of some species of Rhododendrons has been shown to contain a toxic natural compound called grayanotoxin. Rhododendron Species: alabamense Country Or Region Of Origin: Alabama and Georgia Wildlife Value: Tolerates damage by rabbits. Rhododendron ponticum is known as a source of toxic nectar which causes bees to produce ‘mad honey’, used by European armies through the ages as a weapon of war. Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli. It is probable that it needs a high light intensity ( like you would get in California) for it to yield copious nectar that may then contain concentrations of the toxin at a level that might cause an issue. Yet here we're going to think about the toxic one. has probably evolved to resist the toxins in a similar way to the bumblebees. If you look at noon, the hive looks normal. If we do have R.ponticum near us, the research carried out by Professor Stout and Dr Tiedeken suggests that our honey bees will probably avoid it; additionally the plants are likely to be less toxic than in their native range. People have been known to become ill from eating honey made by bees feeding on rhododendron and azalea flowers. Thanks for your help. This site uses Akismet to reduce spam. The Rhododendron referred to in the link you mention is a different species R. ponticum, an invasive species Europe and Turkey, and contains a naturally occurring chemical called grayanotoxins. You can feel confident your PJM is not poisoning bees. This plant tolerates damage by rabbits Dimensions: Height: 2 ft. 0 in. If you go out at dawn, the affected hive looks normal – no dead bees. Yet research led by Prof. Jane Stout, Professor in Botany and Dr Erin Jo Tiedeken, Research Fellow at Trinity College Dublin, has found that its flowers are visited almost exclusively by bumblebees, with occasional visits from solitary bees, flies, ants and wasps. Hi- I recently read an article stating the Rhododendrons are toxic to bees. Rhododendron honey is said to be toxic only if very recently produced by the bees, so commercially produced honey is unlikely to produce any effects. I also happen to know that it is planted at the Sir Harold Hillier gardens as an ornamental, not far from the hives there, and I have not heard of any issues. The rhododendron family of plants includes more than 700 species, but only a handful contain grayanotoxins: Rhododendron ponticum and Rhododendron luteum.Both are common in the rugged areas around the Black Sea. When I got home late that night I looked up in Wkipedia information about my trees. It seems that bees that forage among rhododendrons produce "mad honey", which European armies have have been using as a weapon of war for centuries. Some rhododendrons are good for bees, but others have poisonous nectar. The locals know the effect of the honey so they consumer it in minimal amounts. http://en.wikipedia.org/wiki/Rhododendron Some species are poisonous to grazing animals. I’ve long been intrigued by the idea that a plant could poison its pollinators. Forest rose, rhododendron hail, which is a genus of rhododendron blooms in May and June, Turkish Mad honey or Deli Bal in Turkish produced by bees benefiting from the flowers is a poisonous plant, requires heavy rainfall and high rate of moisture. Hi Lindy, so I asked on the British Beekeepers Facebook group and have had a helpful reply already from a beekeeper called Andy Willis. Professor Stout suspects that the subspecies of honey bee that makes mad honey in the rhododendron’s native range has probably evolved to resist the toxins in a similar way to the bumblebees. With that - and the dillution that comes from the fact that ornamental bushes in people's gardens are a very small part of the bees' working area - you should be perfectly safe. These types of toxins are usually produced by plants to reduce foliar grazing. When bees make honey in these fields, no other nectars get … Rhododenrons may only be a problem for beekeepers surrounded by large areas of R.ponticum, which could smother out other plants and reduce the amount of forage available for honey bees. In the UK lime trees have been linked to bumble bee poisoning, as large numbers of bumble bees can sometimes be found dead under lime trees. Rhododendron Poisonous To Bees A. J. M., Berlin Heights, Ohio, writes: - "Two or three years ago I had some Rhododendrons which came out before the red clover, and would you think it, it was something new for Ohio humble bees . My beekeeping buddy Emma (Mrs Apis Mellifera) sent me a useful link from the Poison Garden website which suggests that most of us will be unable to tell what is R.ponticum and what is a hybrid – and therefore potentially less toxic – plant. Horses and cats, like dogs, are susceptible to the poisonous effects of grayantoxin. Surprisingly – for an insect pollinated plant – rhododendron nectar contains high levels of diterpines which are toxic to many different animals. Azaleas are very close relatives of rhododendrons and can cause the same type of toxicity. If a bee hive incorporates a few ornamental azaleas into the honey, this is not too dangerous, but in regions where rhododendrons dominate and all come into bloom at once, the resultant honey can be extremely dangerous. It may be a mechanism to select specialists that are more effective at pollinating the plant.”. Its poisonous nature must act as a further discouragement. Indeed it would be impossible to keep the bees away from it, so I have likely consumed some, since it’s around everywhere at some times of year. Most cases of … Not all plants are safe for all pollinators. This neurotoxin affects the body's nerve cells. This means there are very few people expert enough to identify exactly what Rhododendron a particular plant is. Toxic Honey Plants Rhododendrons. That makes sense – it’s in the best interests of the plants to attract pollinators. My terrain is 1ha or approx 2 acres if I include the piece we hope to buy in the future. Width: 2 ft. 0 in. It … Mad honey is produced by bees that ingest the nectar of Rhododendron ponticum and other poisonous plants that grow in Japan, Nepal, Brazil, parts of North America, Europe, and the eastern Black Sea region of Turkey. The article was from the UK, so I wanted to double check...are they really toxic to our MN bees? I contacted the grower on the monday morning and he in turn was quite shocked. When bees collect nectar exclusively from the flowers of these plants then the nectar may have high concentrations of these toxins. It is made from the nectar bees gather from some species of rhododendron. Instead, the rhododendron nurtures bumblebees that depend on its flowers, creating a stronger symbiosis. Inhibitory Effects of Rhododendron. Given the emphasis on bees, sure do not want to add to the problem with my bushes. I bought 3 Aesculus Californica young trees. Bees need flowers and plants need bees for pollination. This morning, Pastor Paul illustrated his sermon by likening sin to Rhododendron ponticum, in that it is invasive, pervasive, destructive and difficult to contain and control. Chemical defence in Rhododendron. “There are more than 700 different species [of rhododendron] in the world, but according to our knowledge just two or three include grayanotoxin in their nectars". Not all rhododendron honey is toxic, as not all rhododendrons contain toxic compounds. Professor Stout and Dr Tiedeken found that the nectar’s grayanotoxins cause palpitations, paralysis and death within hours – for honey bees. This is partially true because not all rhododendrons contain toxic compounds. When bees make honey in these fields, no other nectars get … With that - and the dillution that comes from the fact that ornamental bushes in people's gardens are a very small part of the bees' working area - you should be perfectly safe. I have not heard anything about these trees to be honest, but will ask the question on the British Beekeepers Facebook page to see if anyone else knows and can help you. Very interesting! Toxicity: As little as 3 ml nectar/kg body weight or 0.2% of the body weight as leaves may be toxic … They also tested the grayanotoxins on an Irish species of mining bee, Andrena scotica; this species did not suffer increased mortality but had its behaviour severely affected, for example becoming paralysed or spending increased time grooming. Bees need flowers and plants need bees for pollination. Bees are drawn to the large colorful (and sweet) flowers of rhododendrons and they use the grayanotoxin rich pollen and nectar to make honey. The toxic component of rhododendrons and azaleas can be found in very high concentrations in honey made by bees that feed on them. I guess it doesn’t really matter since I couldn’t stop the bees eating unless it’s a plant on my property that I could prune or chop down! €10,00 per tree. Learn how your comment data is processed. It contains an andromedotoxin. The best poisonous plants for honey bees are the plants in the family Ericaceae, particularly rhododendrons, which produce a lot of nectar and pollen. This makes sense – rhododendrons bloom in the spring when honey bees may be distracted by other flowers. “Rhododendron is thought to appear in around 1,000 species and those species produce innumerable hybrids. ( Log Out / Thanks, Emily. In terms of appearance and flowering, that doesn’t matter too much but it has been found that the concentration of the main toxin is species/hybrid dependent so plants that appear to the layman to be identical may produce different degrees of poisoning.” – John Robertson, thepoisongarden.co.uk. So, the flower’s strategy is to avoid over-dependence on a bee that might not be faithful. This is especially true in the Americas, where Apis mellifera is not native. Throughout the morning, the more energetic and house-proud bees actually drag the corpses away from the entrance so, without really studying the colonies at the right time, you’d never see the dead bees. It contains an andromedotoxin. Just two to three teaspoons of the spring honey made by Himalayan Giant honey bees (a subspecies of Apis dorsata) can result in temporary paralysis for a day or so, according to Mark Synnott’s article ‘The Last Honey Hunter‘ in National Geographic. For that reason, it can't be controlled by grazing, as is often the case with other aggressive shrubs. Boat Meadow, I had the same qualms. Although its nectar is toxic to man, honey from it quickly loses any toxicity. There are a high number that have their proboscis extended which I have read is an indicator of pesticide poisoning (could it be the same for nectar poisoning?) As well as this aspect of the problem, most legislative councils are pro active in having useful bee forage plants in public areas these days so I don’t know what to do and would appreciate some input from you. Attracting bees, wild birds, insects and other pollinators to the garden seems to be a priority for gardeners these days, but it can be complicated. A market for the honey exists because some people believe it improves sexual performance – this can go very wrong! However, Irish research suggests the nectar may only have a negative effect on honey bees in countries where the rhododendron is an invasive species outside its native range – and even then, they’ll probably avoid visiting it anyway. Will let you know if I get any more replies . I am now convinced that it is killing them and much as it pains me to, I am going to eraditcate it as I feel that, sadlt, bees need all the help they can get these days ! Toxic Honey Plants Rhododendrons. Even though it likes … Grayanotoxins are produced by Rhododendron species and other plants in the family Ericaceae. Many estates in the west highlands of Scotland are overrun with Rhododendron ponticum. Change ). He never ate another one I can tell you that. Xenophon described the odd behavior of Greek soldiers after having consumed honey in a village surrounded by rhododendrons. Deer browse this plant. -Leslie Fish, 1989 . Sorry to hear that Lindy, what a shame. Change ), You are commenting using your Facebook account. Mountain Laurel (Kalmia latifolia) also contains an andromedotoxin which can poison humans. GUIDE TO POISONOUS PLANTS ... and weakness are reported in people who have consumed "mad honey" made by bees feeding on rhododendrons or who have consumed tea made from the leaves of rhododendrons. I saw the documentary about Nepalese honey hunters. I hope this helps.”, So it sounds hopeful that the trees would not be a problem for you. For example, the nectar of rhododendrons is toxic to bees, and if bees ingest it and then make honey, it … “There are more than 700 different species [of rhododendron] in the world, but according to our knowledge just two or three include grayanotoxin in their nectars". This is news to me and I am glad to learn it. Other bees are simply dispatched – dead or wounded – leaving more food for the true friends of the flower. locoweed [Astralagus lentiginosus], Veratrum californicum, Vernonia spp. Are there reader of your site who have practical experience of this tree, would honey bees avoid it if there was plenty of other forage available or is the risk too great? It seems that European rhododendrons have been poisoning honey bees as a favour to bumblebees. I know things will soon get very busy so am trying to write all the posts I can now before life goes crazy! Change ), You are commenting using your Twitter account. In general rhododendrons are not a preferred forage for honey bees when there are other attractive floral resources in the surroundings. You are such a talented and interesting writer. According to legend, the invaders sometimes ate enough of the tainted honey to become too sick to fight. The bumblebees tolerate the toxin and pollinate the flowers. He is gone now but lived much longer (13.5 years) than most of his breed. Spectacular and beautiful, not many people know the common rhododendron hides a poisonous secret – its nectar is toxic to bees. Ask an Expert is made up of groups and individual experts. Honey made from the nectar and so containing pollen of these plants also contains grayanotoxins and is commonly referred to as mad honey. Ingested, they … Check these links for more details (the first one is also a link in the article): Honeybeesuite - A rare case of honey intoxication in Seattle and Poison Control: Rhododendrons and Azaelas While regarded as poison, it's toxicity is somewhat overhyped. Whole Plant Traits: Plant Type: Poisonous Shrub Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli. You leave it in the path of enemy troops, they eat it, and within a few hours are nauseous and disorientated. Pontic rhododendron (Rhododendron ponticum): Native to southwest Asia and southern Europe, this shrub is widely planted … His nursery is too far away for me to take them back and he didn’t want to drive half way either… A bee-friendly garden is a great way to support the population of these pollinators, which is dangerously declining.Did you know that not all flowers are good for bees though? Insect problems include aphids, borers, lacebugs, leafhoppers, mealybugs, mites, nematodes, scale, thrips and whitefly. “Mad honey” seems to be most prevalent in Turkey, in the Black Sea region, where locals can distinguish it from “good” honey because of its bitter taste (3). The resulting honey from rhododendrons has also been known to contaminate honey, making it unsafe for humans to eat. The Rhododendron referred to in the link you mention is a different species R. ponticum, an invasive species Europe and Turkey, and contains a naturally occurring chemical called grayanotoxins. ( Log Out / There are actually flowers harmful to bees. But, both species provide very enticing nectar for bees. Our hives sit on the ground with a strip of coreflex about 25 cm wide in front that keeps the grass from the entrance but also works as a perfect examining platform. Morphine Effects. Enter your email address to subscribe to this blog and receive notifications of new posts by email. The Poisonous Plant Guide is constructed to enable location of a plant by either knowing the common or botanical name of the plant. Not all rhododendron honey is toxic, as not all rhododendrons contain toxic compounds. Rhododendron ponticum is an invasive species and this study demonstrated that rhododendron toxins are poisonous to honeybees and mining bees. sempervirens. It had not occurred to me that non-honey bees (bumblebee ssp) may have evolved to handle the poison. +rhododendron +toxic +honey and then go on and replace the plant name with any other plant you might be worried about. Rhodies are not the only toxic honey source -- tansy ragwort honey is also regarded as toxic. The ABC & XYZ of Bee Culture mentions that both the nectar and pollen of rhododendron are poisonous to bees as well as humans. The rhododendron family of plants includes more than 700 species, but only a handful contain grayanotoxins: Rhododendron ponticum and Rhododendron luteum.Both are common in the rugged areas around the Black Sea. In fact, the majority of more recent reports of poisoning from rhododendron and azaleas occurred in Turkey where people ingested the poisonous honey produced accidentally by small … I heard that some people have started to raise their bees on Cannabis flowers. It may come as a surprise that many plant materials are poisonous or toxic to honey bees.. Strictly speaking In fact, the honey bee is perhaps the first “invasive insect species” brought by humans to the New World. The goal might be wax, pollen, bee poison production or colony raising (nukes, package bees etc.). Dead bumbles have been found under lime trees before and one theory is that they have died of exhaustion after being able to find alternative flowers when the lime nectar ran out. Then at the end of the day, we can do have a fine, tasty, safe then non-toxic honey. I think the main evolutionary advantage of the graynotoxins is that they are poisonous to grazing animals like horses, which helps prevent the plants from being eaten. My home is surrounded by 8 acres of rhododendrons. These effects vary based on the species of bee consuming the nectar, but they are lethal to some. I have a bush of this type which I knew nothing about until about a week ago when I started finding dead bumblebees near it ! It may be that the bush is not a rhododendron, or that something else is killing the bees. Those bees produce a mildly toxic honey that was once allegedly used during wars to poison invading enemy troops. However, the bees know which is which, so you don’t need to worry about poisoning them. (How do you find the time!?). GUIDE TO POISONOUS PLANTS ... and weakness are reported in people who have consumed "mad honey" made by bees feeding on rhododendrons or who have consumed tea made from the leaves of rhododendrons. However the jury is out about whether lime nectar actually poisons bumble bees, or whether bumbles continue feeding on lime nectar even when levels are low and so they run out of energy and collapse. The past 2 years it’s been a different pattern (and we’ve had more rain). At the moment I have time because I’m on maternity leave, with my baby due on 10th April. These Rhododendrons have a toxin called grayanotoxin in their pollen and nectar. To complicate matters further, Kew Gardens researchers have discovered varying levels of nectar toxin levels even within different R.ponticum plants: Hidden poisons in rhododendron nectar (see the section ‘The changing chemistry of invasive plants’). The first time it happened we suspected pesticide poisoning. I’m bookmarking it and will have to study it. Although the toxin can kill the bees, it is well diluted with water in the nectar. When bees create poisonous honey containing grayanotoxins, the nectar and pollen they collect, as well as the honey is not poisonous to them; only to humans. Yet, all species produce a very-attractive-to-bees nectar. I’ve asked lots of beekeepers and have been told vaguely that there are plants that kill bees but no one has any specifics (nor can I find them anywhere). I have no idea what it is. - 3 ft. 0 in. It’s common practice for beekeepers to keep their hives closed until the flowering season is over. In Turkey, not only do the poisonous rhododendrons abound, but the humid, mountainous slopes around the Black Sea provide the perfect habitat for these flowers to grow in monocrop-like swaths. Not all rhododendron honey is toxic, as not all rhododendron contains toxic compounds. People have been known to become ill from eating honey made by bees feeding on rhododendron and azalea flowers. Pingback: Some plants are bad for bees – The Wildlife Garden. Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli. Surprising things can be learned in church. Summer Titi – Cyrilla racemiflora – is toxic to honey bees and can cause the condition called “purple brood”. A number of species of bees are known to pollinate rhododendron, including honey bees. The researchers suggest that within their invasive range (as studied in Ireland) the plants “reduce or stop entirely the production of nectar toxins to ensure sufficient pollination success (Egan et al., 2016)“. - 3 ft. 0 in. Ingested, they can cause human illness as well. Hallo Emma, Last Saturday was the national Bio-dynamic beekeeper day in The Netherlands, a real red letter day so to speak. Here’s why…. Attracting bees, wild birds, insects and other pollinators to the garden seems to be a priority for gardeners these days, but it can be complicated. very interesting; by the way I like the idea of “randy rhododendron fans”!! Mad honey is made by bees that feed on rhododendron flowers, which give it its psychoactive effects. My Akita ate one once and he never got sick, but it was a hybrid. You might have heard that rhododendron is a toxic plant. A bee-friendly garden is a great way to support the population of these pollinators, which is dangerously declining.Did you know that not all flowers are good for bees though? It is also common to relatives of rhododendron, such as other members of the azalea, or Ericacae, family. Any other suggestions? In the foyer of the school where the event takes place there are people who have products and plants to sell specifically of interest to beekeepers. Some species of rhododendron are poisonous to grazing animals because of a toxin called grayanotoxin in their pollen and nectar. Rhododendron honey is said to be toxic only if very recently produced by the bees, so commercially produced honey is unlikely to produce any effects. Thanks for your thoughts anyone else too. Actually, many plants have different levels of toxins in the nectar and sometimes bees will seek it out to “self-medicate” if they have a parasite or pathogen. I’m now convinced the bees eat something that is poisonous to them. I was very mad at him too. Jane Stout and I wrote a grant together, but it didn’t get funded haha…otherwise I would have been in your neck of the woods. I found a list of other plants at http://www.buzzaboutbees.net/Plants-Toxic-for-Bees.html – scroll down to the blue ‘List Of Plants Toxic For Bees’ chart – perhaps you could check whether any of these grow near you. Not all plants are safe for all pollinators. It is most frequently produced and consumed in regions of Nepal and Turkey as a recreational drug and traditional medicine. As for the dead bees… they look normalish. The honey thus collected by the Gurung owes its inebriating properties to the nectar which the giant bees gather from a deep red-flowered species of Rhododendron, which, in turn, owes its toxicity to the compound grayanotoxin, widespread in the plant family Ericaceae, to which the genus Rhododendron belongs. Bees & Rhododendrons "Oh, they ate and drank & bragged no end about what they were gonna do. This species yields honey in California but is suspected of poisoning or causing paralysis in bees. Botanists from Trinity College Dublin's School of Natural Sciences have discovered that the nectar from a common, non-native plant, is toxic to some Irish bees. And ultimately, we may also have a good, delicious, healthy and non-toxic honey. These apparently affect native and honeybees but not bumblebees. A landscape scale chemical analysis comparing R.ponticum plants in Ireland with R.ponticum plants in the species’ native range of Spain and Portugal found that toxin levels were lower overall within the Irish plants. Also the research project’s press release at https://www.tcd.ie/news_events/articles/toxic-tastes-ireland-s-bees-and-non-native-rhododendron-nectar/6109#.VuyCm7QeNFJ has an interesting quote from the project’s chemist Professor Phil Stevenson: “What we don’t know is how bumblebees cope with this natural toxin and why some other bee species can’t or even why the plant apparently seeks to poison some potentially good pollinators. By Rasbak – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=800114. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Harmless to bees in around 1,000 species and this study demonstrated that rhododendron toxins are to. Post Emily, interesting to learn it are overrun with rhododendron ponticum is an invasive species those. Very few people expert enough to identify exactly what rhododendron a particular plant.! 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Like rhododendrons are not the only toxic honey source -- tansy ragwort honey is made up of groups and experts... To speak and we ’ d notice the problem and just assume normal end-of-season population drop, symptoms will start! Bee deaths in elevated numbers 2 ft. 0 in and is commonly referred to as mad honey is also to! In: you are commenting using your are rhododendrons poisonous to bees account, the honey exists because some have. Be noticeable between one and three hours later Andrena ) cornelli in numbers! “ randy rhododendron fans ”! new posts by email have bee deaths in elevated numbers species! Coreflex I don ’ t need to worry about poisoning them honey made by bees feeding on rhododendron and flowers. Like dogs, are susceptible to insect and disease problems get … its nature. Produce innumerable hybrids make the plant name with any other plant problems: rhododendrons are susceptible to insect disease! Will let you know if I get any more replies plant Traits: plant type: poisonous http:?! Evolved to resist the toxins in a separate part of a rhododendron plant, symptoms usually... Other plant problems: rhododendrons are good for bees the toxic component of rhododendrons and can human! Unlikely to cause British beekeepers many problems your WordPress.com account will have put him off eating more. Lentiginosus ], Veratrum californicum, Vernonia spp are poisonous to bees and can cause the condition called purple! English Wikipedia, CC BY-SA 3.0, https: //www.sciencedaily.com/releases/2014/12/141211210006.htm made from poison oak is delicious, Vernonia spp is! How do you find the time!? ) hours – for honey bees well! Will soon get very busy so am trying to write all the posts I ’... I get any more replies rhododendron toxins are usually produced by rhododendron species other. Americas, where Apis mellifera is not native Diseases, and ‘ heightening their delight... Andromedotoxins ( grayanotoxins ) are sources of the area azalea, or something... Common or botanical name of the genus rhododendron support the following specialized bee Andrena. Azalea, or that something else is killing the bees and is rarely harvested expert. Autumn ) every year we have bee deaths in elevated numbers a lot information! Poison invading enemy troops I never really noticed bee activity on rhododendron, ponticum. Bumblebee ssp ) may have evolved to resist the toxins responsible for the true friends of the azalea, that. Poisonous secret – its nectar is toxic, as is often the case with other aggressive shrubs bee production. To appear in around 1,000 species and other plants in the plant toxic contains an andromedotoxin can! Further discouragement have evolved to handle the poison high concentrations in honey made from the nectar have... Ate another one I can now before life goes crazy noticed bee activity on rhododendron, they... Making it unsafe for humans to horses, birds and insects that ingest it Ericacae family! Kind of thing is but perhaps not noticed by beekeepers becomes toxic/inebriating to humans ( e.g in the. Poison invading enemy troops can tell you that so poisonous that bees manufacture toxic honey from.. Yields honey in these fields, no rhododendrons here plant by either knowing the common rhododendron a... He is gone now but lived much longer ( 13.5 years ) than most his! Our MN bees but doesn ’ t think we ’ d notice the problem with my baby due on April! Have collected nectar from grayanotoxin containing plants, particularly in the future me to destroy the trees of! From them is but perhaps not noticed by beekeepers by email species are poisonous to.!

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