Imidacloprid is een systemisch insecticide uit de neonicotinoide groep. De toxiciteit van imidacloprid en zijn metabolieten voor bijen, de verspreiding van imidacloprid in het milieu en de manieren waarop bijen eraan bloot gesteld worden komen aan bod in deze rubriek. Zie ook de imidacloprid-factsheets in de linker menubalk, 4e blok.

Tweede Kamer spreekt over landbouwgif en bijensterfte

Op dinsdag 13 september sprak de Tweede Kamer over gewasbeschermingsmiddelen en bijensterfte. Er werden moties ingediend die vragen om ondermeer:

  • [Ouwehand PvdD] de herbeoordeling van neonicotinoïden van het CTGB voor toetsing voor te leggen aan onafhankelijke onderzoekers;
  • [Van Gerven SP] onmiddellijk een verbod uit te vaardigen voor het gebruikvan gevaarlijke bestrijdingsmiddelen als neonicotinoïden, in die gebieden waarin de aanvaardbare normen in het oppervlakte- of grondwater worden overschreden;
  • [Van Gerven SP] dat een onafhankelijke commissie van onder andere ethici en wetenschapsfilosofen onderzoek doet naar de onafhankelijkheid en objectiviteit bij de beoordeling van toelating van gewasbeschermingsmiddelen en de verwevenheid met het bedrijfsleven van het CTGB;
  • [Jacobi PvdA] onder regie van het ministerie van Volksgezondheid nader onderzoek op de vermeende effecten van imidacloprid op het zenuwstelsel van de mens;
  • [Koopmans CDA] de toelatingsprocedure voor landbouwgif zo eenvoudig en goedkoop mogelijk te maken

Bij de stemming in de nacht van 15 op 16 september zijn al deze moties - met uitzondering van de motie Koopmans - verworpen.

Save The Bees Petition in New Zealand by MP

Thursday, 08 Sep 2011
Report by Sue Kedgley MP in New Zealand to the Local Government and Environment Select Committee

1. An urgent reassessment by the ERMA [now EPA] of Neonicotinoid insecticides, and the use of other pesticides that are highly toxic to bees

The petition calls for an urgent reassessment by the Environment Protection Agency of the use of Neonicotinoid insecticides in New Zealand-and in particular their use as a seed coating on seeds such as grass and maize, as there is mounting evidence that Neonicotinoids may be contributing to unacceptable levels of bee deaths and to the phenomenon of Colony Collapse Disorder overseas.

Kamerbrief: Staatssecretaris Bleker schorst 3 toelatingen van imidacloprid wegens onnaleefbaarheid Ctgb gebruiksvoorschrift

Den Haag, 1 juni 2011
Geachte Voorzitter,

Per brief heb ik uw Kamer op 28 april jl. laten weten welke besluiten het College voor de toelating van gewasbeschermingsmiddelen en biociden (Ctgb) heeft genomen op basis van de voorlopige resultaten van de herbeoordeling van de effecten van neonicotinoïden op bijensterfte. In dezelfde brief heb ik ook aangegeven dat ik het Ctgb heb verzocht drie insectendodende middelen voor niet-professioneel gebruik voor spuit- en aangiettoepassingen te heroverwegen en deze te verbieden of de toelating ervan op te schorten in afwachting van de definitieve herbeoordeling.

Brief Bleker aan Tweede Kamer over herbeoordeling Neonicotinoiden

Geachte Voorzitter,

Per brief (Kamerstukken II 2010/11, 32 372, nr. 46) heb ik u op 22 maart jl. laten weten dat het College voor de toelating van gewas­beschermingsmiddelen en biociden (Ctgb) het verzoek van de Kamer inzake de herbeoordeling van neonicotinoiden op de effecten voor bijen uitvoert.

Hoorzitting bezwaar tegen toelating Merit Turf

Bijenstichting diende op 22 juli 2010 een bezwaarschrift in tegen het toelatingsbesluit voor het bestrijdingsmiddel Merit Turf.

Merit Turf is een bestrijdingsmiddel op basis van imidacloprid dat door het College voor de Toelating van Gewasbeschermingsmiddelen en Biociden is toegelaten voor de bestrijding van engerlingen en emelten (larven van de meikever en de langpootmug) in golfbanen, sportvelden, graszodenteelt en openbaar gras.

Het bezwaar wordt 20 april 2011 behandeld door de Adviescommissie voor de Bezwaarschriften van Ctgb in een openbare hoorzitting.

Neonicotinoid implicated in Honeybee mass poisoning incidents

An investigation by Buglife – the Invertebrate Conservation Trust has revealed that contrary to statements made by Government scientists from the National Bee Unit on yesterday’s Channel 4 News item - -, there is evidence of an increasing link between Neonicotinoid pesticides and bee deaths in Britain.

Study reveals how bees reject 'toxic' pesticides

By Michael McCarthy, Environment Editor - The Independent - Tuesday, 5 April 2011
Bees can detect pesticide residues in the pollen they bring back to the hive and try to isolate it from the rest of the colony, the American government's leading bee scientist revealed in London yesterday.

They "entomb" the contaminated pollen in cells which are sealed over, so they cannot be used for food, said Dr Jeffrey Pettis, head of the Bee Research Laboratory of the US Department of Agriculture.

The Threat of Neonicotinoid Pesticides on Honeybees, Ecosystems, and Humans

[NGO Viewpoint] The Japan Endocrine-disruptor Preventive Action programme published a report on the impacts of the very large scale use of neonicotinoid insecticides (Nitenpyram, Thiamethoxam, Thiacloprid, Dinotefuran, Clothianidin, Imidacloprid and Acetamiprid) in Japan on ecosystems, honeybees and human health in Japan.

UNEP report says world's food stocks at risk as bee colonies dying out

A MIXTURE of chemicals found in modern pesticides may be killing bee colonies around the world, according to a UN report. Seeds are being coated in systemic insecticides that spread throughout the plant, from the roots to the flowers and into the nectar and pollen. The report says that the highly toxic chemicals in the insecticides, collectively known as neonicotinoids, can cause loss of the sense of direction and memory on which bees rely to find food. The UN Environment Program (Unep) report says that when neonicotinoids are combined with certain fungicides, the toxicity becomes 1000 times stronger.

Overzicht gewassen en teelten waar neonicotine insecticiden in Nederland zijn toegelaten

De voor bijen zeer schadelijke insecticiden uit de neonicotine-groep (ondermeer imidacloprid, thiamethoxam, clothianidine en thiacloprid) zijn in Nederland zeer ruim toegelaten. Een overzicht van de gewassen en teelten waar het wordt gebruikt is hier te vinden:

Varroa Mite and Neonicotinoid Pesticides

[From Feb 2011]
Varroa mite is one of the biggest threats to honey bee colonies. In the UK, it was first discovered in 1992. Exposure to this pest causes viruses and diseases to be transmitted to honey bees, such as Deformed Wing Virus. But could it be that neonicotinoid pesticides play a role in Varroa too?

Insecticides playing Russian roulette with our economy

The world’s bee populations are under an increasing – and perhaps under-estimated range of threats. These threats comprise a suite of problems including new exotic pathogens, loss of diverse forage, a new generation of insecticides, the stresses we place on our hives through moving them, and introducing chemical controls for existing pathogens like the Varroa bee mite. We cannot eliminate pathogens like Varroa once they are here, but we can do something about another major challenge facing honeybees - the new generation of insecticides called neonicotinoids.

Superlandbouwgif bedreigt insecten

"We zijn bezig de insecten uit te roeien", meent toxicoloog Henk Tennekes. Bijen, hommels, maar ook vlinders, kevers en muggen. Steeds meer insecten leggen het loodje.
Lees het hele artikel in De Gelderlander

Cell death localization in situ in laboratory reared honey bee (Apis mellifera L.) larvae treated with pesticides

Abstract: In this study, cell death detected by DNA fragmentation labeling and phosphatidylserine (PS) localization was investigated in the honey bee (Apis mellifera L.) midgut, salivary glands and ovaries after treating larvae with different pesticides offered via an artificial diet. To do this, honey bee larvae reared in an incubator were exposed to one of nine pesticides: chlorpyrifos, imidacloprid, amitraz, fluvalinate, coumaphos, myclobutanil, chlorothalonil, glyphosate and simazine. Following this, larvae were fixed and prepared for immunohistologically detected cellular death using two TUNEL techniques for DNA fragmentation labeling and Annexin V to detect the localization of exposed PS specific in situ binding to apoptotic cells.
Untreated larvae experienced 10% midgut apoptotic cell death under controlled conditions. All applied pesticides triggered an increase in apoptosis in treated compared to untreated larvae. The level of cell death in the midgut of simazine-treated larvae was highest at 77% mortality and statistically similar to the level of cell death for chlorpyrifos (65%), imidacloprid (61%), myclobutanil (69%), and glyphosate (69%) treated larvae. Larvae exposed to fluvalinate had the lowest midgut columnar apoptotic cell death (30%) of any pesticide-treated larvae. Indications of elevated apoptotic cell death in salivary glands and ovaries after pesticide application were detected. Annexin V localization, indicative of apoptotic cell deletion, had an extensive distribution in the midgut, salivary glands and ovaries of pesticide-treated larvae.
The data suggest that the tested pesticides induced apoptosis in tissues of honey bee larvae at the tested concentrations. Cell death localization as a tool for a monitoring the subclinical and sub-lethal effects of external influences on honey bee larval tissues is discussed.

Behind the Label: Flea Powder

Fleas and ticks are a profitable market for the chemical/pesticide industry, but ‘convenient’ spot-on flea and tick treatments have come under fire recently. The active ingredients in these pet products used to be organophosphates (such as chlorpyrifos, dichlorvos, phosmet, naled, tetrachlorvinphos, diazinon, or malathion) and carbamates (such as carbaryl or propoxur), but these chemicals are being phased out and replaced by newer insecticides such as imidacloprid. Modern ‘spot-on’ products may not harm pets or humans with the initial exposure, or even after several exposures. Exposed in this way it takes longer for negative effects to reveal themselves. Small chronic exposures add up. As with small children, pets cannot report when they’re being poisoned at low doses.

Tea products contain excessive imidacloprid residues

Two out of 20 tea products recently tested in New Taipei City contained excessive levels of pesticide residue, according to the results of a food safety check released by the city's Public Health Bureau. The bureau found that the products contained more than twice the tolerable limits of below 3 ppm and 1 ppm for Imidacloprid and Carbofuran, respectively.

Have we learned nothing since 'Silent Spring'?

The Independent, 7 Jan 2011
Nicotine, found in tobacco, is a deadly substance – and not only for smokers. It has long been known as a powerful natural insecticide, and its presence in the tobacco crop has evolved to deter pests; it is toxic to virtually all of them.
In the great mysterious crash of bee populations, which has been gathering speed around the world for the past decade or so, and which has started to alarm even governments because of the vast worth of bee pollination to the agricultural economy (more than £12bn annually just in Europe), neonicotinoids are increasingly suspect. In the great crash of other insect populations which has similarly been taking place, about which governments do not give a toss but which nonetheless threatens the natural environment with catastrophe (many insectivorous birds are dropping dramatically in numbers), neonicotinoids are similarly in the frame.
Read the full story in The Independent: calls for ban on bee-killing pesticides - more than 1,000,000 signatures on 20.01.2011

Bees are dying off and our entire food chain is in peril. Scientists blame toxic pesticides, and four European governments have already banned them, but the deadly poison is still for sale in the USA. If we urgently get the government to join the ban we could save bees from extinction. Sign the petition and forward this appeal

An assessment of honeybee colony matrices, Apis mellifera (Hymenoptera: Apidae) to monitor pesticide presence in continental France

Marie-Pierre Chauzat, Anne-Claire Martel, Nicolas Cougoule, Philippe Porta, Julie Lachaize, Sarah Zeggane, Michel Aubert, Patrice Carpentier And Jean-Paul Faucon, Environ. Toxicol. Chem. 30, pre-published online.

Abstract — The frequency of occurrence and relative concentration of 44 pesticides in apicultural (Apis mellifera) matrices collected from five French locations (24 apiaries) were assessed from 2002 to 2005. The number and nature of the pesticides investigated varied with the matrices examined—living honeybees, pollen loads, honey, and beeswax. Pollen loads and beeswax had the highest frequency of pesticide occurrence among the apiary matrices examined in the present study, whereas honey samples had the lowest. The imidacloprid group and the fipronil group were detected in sufficient amounts in all matrices to allow statistical comparisons. Some seasonal variation was shown when residues were identified in pollen loads.Given the results (highest frequency of presence) and practical aspects (easy to collect; matrix with no turnover, unlike with bees that are naturally renewed), pollen loads were the best matrix for assessing the presence of pesticide residues in the environment in our given conditions.

A meta-analysis of experiments testing the effects of a neonicotinoid insecticide (imidacloprid) on honey bees

James E. Cresswell, Ecotoxicology, article in press, pre-published online 16 November 2010

Abstract: Honey bees provide important pollination services to crops and wild plants. The agricultural use of systemic insecticides, such as neonicotinoids, may harm bees through their presence in pollen and nectar, which bees consume. Many studies have tested the effects on honey bees of imidacloprid, a neonicotinoid, but a clear picture of the risk it poses to bees has not previously emerged, because investigations are methodologically varied and inconsistent in outcome. In a meta-analysis of fourteen published studies of the effects of imidacloprid on honey bees under laboratory and semi-field conditions that comprised measurements on 7073 adult individuals and 36 colonies, fitted dose–response relationships estimate that trace dietary imidacloprid at field-realistic levels in nectar will have no lethal effects, but will reduce expected performance in honey bees by between 6 and 20%. Statistical power analysis showed that published field trials that have reported no effects on honey bees from neonicotinoids were incapable of detecting these predicted sublethal effects with conventionally accepted levels of certainty.

These findings raise renewed concern about the impact on honey bees of dietary imidacloprid, but because questions remain over the environmental relevance of predominantly laboratory-based results, I identify targets for research and provide procedural recommendations for future studies.

$15 Billion Bee Murder Mystery Deepens

Lead researcher had connections to Bayer Cropscience

Dina Spector | Oct. 12, 2010

It was the buzz heard round the world. On Thursday, the front-page New York Times article titled, “Scientists and Soldiers Solve a Bee Mystery” was supposed to close the book on a four-year long case involving the unexplained death of millions of honey bees nationwide. Instead, it has only brought more confusion, unanswered questions, and anger in the science and beekeeping communities.

What a scientist didn't tell the New York Times about his study on bee deaths

By Katherine Eban, contributorOctober 8, 2010: 1:42 PM ET

FORTUNE -- Few ecological disasters have been as confounding as the massive and devastating die-off of the world's honeybees. The phenomenon of Colony Collapse Disorder (CCD) -- in which disoriented honeybees die far from their hives -- has kept scientists, beekeepers, and regulators desperately seeking the cause. After all, the honeybee, nature's ultimate utility player, pollinates a third of all the food we eat and contributes an estimated $15 billion in annual agriculture revenue to the U.S. economy.

Middelen nog schadelijker voor bijen dan gedacht

De werkzame stoffen imidacloprid en thiacloprid hebben langer een negatief effect op de gezondheid van bijen dan gedacht.

Kamervragen van het lid Polderman (SP) over Merit Turf in relatie met bijensterfte en vervuiling

Vragen van het lid Polderman (SP) over Merit Turf in relatie met bijensterfte en vervuiling van oppervlaktewater
Ingediend 14 juni 2010

1. Klopt het dat op 04-06-2010 heeft het Ctgb besloten Merit Turf imidacloprid (13321) toe te laten in openbare grasvegetatie en graszodenteelt, ter bestrijding van engerlingen en emelten

The puzzle of honey bee losses: a brief review

Stefano MAINI, Piotr MEDRZYCKI, Claudio PORRINI, Bulletin of Insectology 63 (1): 153-160, 2010

The impact of pesticides on honey bees is an issue that has been studied for many years and is now being reconsidered because controversy still exists with the relationship of insecticides and Colony Collapse Disorder (CCD). It is insufficient to explain CCD with only bee pathology studies. Research must be conducted on a wider series of causes: i) in open field and agroecosystems, to understand the fate of pesticide blends, ii) in the hives, to determine ways to enhance honey bee defence to diseases and parasites. References regarding imidacloprid and CCD in the maize agroecosystems are critically reviewed. Pesticides and the thechniques to rationally use them (in particular following the integrated pest management guidelines) represent one of the several puzzles regarding the mystery of CCD or honey bee vanishing. An appendix, i.e., a rejected letter to Science and relevant reply, is also reported.

Full paper:

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