Pesticide toxicity to bees

Pesticides vary in their effects on bees. Contact pesticides are usually sprayed on plants and can kill bees when they crawl over sprayed surfaces of plants or other areas around it. Systemic pesticides, on the other hand, are usually incorporated into the soil or onto seeds and move up into the stem, leaves, nectar, and pollen of plants.[1]

Of contact pesticides, dust and wettable powder pesticides tend to be more hazardous to bees than solutions or emulsifiable concentrates. When a bee comes in contact with pesticides while foraging, the bee may die immediately without returning to the hive. In this case, the queen bee, brood, and nurse bees are not contaminated and the colony survives. Alternatively, the bee may come into contact with an insecticide and transport it back to the colony in contaminated pollen or nectar or on its body, potentially causing widespread colony death.[2]

Actual damage to bee populations is a function of toxicity and exposure of the compound, in combination with the mode of application. A systemic pesticide, which is incorporated into the soil or coated on seeds, may kill soil-dwelling insects, such as grubs or mole crickets as well as other insects, including bees, that are exposed to the leaves, fruits, pollen, and nectar of the treated plants.[3]

Pesticides, especially neonicotinoids, have been investigated in relation to risks for bees such as Colony Collapse Disorder. A 2018 review by the European Food Safety Authority (EFSA) concluded that most uses of neonicotinoid pesticides such as clothianidin represent a risk to wild bees and honeybees.[4][5] Neonicotinoids have been banned for all outdoor use in the entire European Union since 2018, but has a conditional approval in the U.S. and other parts of the world, where it is widely used.[6][7]

Classification

Insecticide toxicity is generally measured using acute contact toxicity values LD50 – the exposure level that causes 50% of the population exposed to die. Toxicity thresholds are generally set at[8][9]

  • highly toxic (acute LD50 < 2μg/bee)
  • moderately toxic (acute LD50 2 - 10.99μg/bee)
  • slightly toxic (acute LD50 11 - 100μg/bee)
  • nontoxic (acute LD50 > 100μg/bee) to adult bees.

Pesticide toxicity

Acute toxicity

The acute toxicity of pesticides on bees, which could be by contact or ingestion, is usually quantified by LD50. Acute toxicity of pesticides causes a range of effects on bees, which can include agitation, vomiting, wing paralysis, arching of the abdomen similar to sting reflex, and uncoordinated movement. Acute toxicity may depend on the mode of exposure, for instance, many pesticides cause toxic effects by contact while neonicotinoids are more toxic when consumed orally.[10] The acute toxicity, although more lethal, is less common than sub-lethal toxicity or cumulative effects.[11]

Sublethal and chronic effects

Field exposure to pesticides, especially with relation to neonicotinoids,[12] may lead to multiple physiological and/or behavioral sublethal effects in exposed bees.[13] Sublethal effects to honey bees can include disruptions to behavioral and motor functions, compromised immunity, and delayed development.[14][15][16]

Colony collapse disorder
Main article: Colony collapse disorder

Colony collapse disorder (CCD) is a syndrome that is characterized by the sudden loss of adult bees from the hive. Many possible explanations for it have been proposed, but no one primary cause has been found. The US Department of Agriculture indicated in a 2010 report to Congress that a combination of factors could be causing colony collapse disorder, including pesticides, pathogens, and parasites. Although pesticides were suspected to be part of the problem, a survey of healthy and CCD-affected colonies revealed similar levels of pesticides in wax and pollen.[17]

Bee kill rate per hive

The kill rate of bees in a single bee hive can be classified as:[18]

< 100 bees per day - normal die off rate
200-400 bees per day - low kill
500-900 bees per day - moderate kill
1000+ bees per day - High Kill

Pesticide formulations

Pesticides come in different formulations:[2]

  • Dusts (D)
  • Wettable powders (WP)
  • Soluble powders (SP)
  • Emulsifiable concentrates (EC)
  • Solutions (LS)
  • Granulars (G)

Pesticides

All substances listed are insecticides, except for 2,4-D, which is an herbicide. Some substances are arachnicides too.

Common name (ISO) Examples of Brand names Pesticide Class length of residual toxicity Comments Bee toxicity
Aldicarb Temik Carbamate apply 4 weeks before bloom Relatively nontoxic
Carbaryl[19] Sevin,

(b) Sevin XLR

 Carbamate High risk to bees

foraging even 10 hours after spraying; 3 – 7 days (b) 8 hours @ 1.5 lb/acre (1681 g/Ha) or less.

 Bees poisoned with carbaryl can take 2–3 days to die, appearing inactive as if cold. Sevin should never be sprayed on flowering crops, especially if bees are active and the crop requires pollination. Less toxic formulations exist. Highly toxic
Carbofuran[20] Furadan Carbamate 7 – 14 days U.S. Environmental Protection Agency ban on use on crops grown for human consumption (2009) carbofuran (banned in granular form)[20] Highly toxic
Methomyl[21] Lannate, Nudrin Carbamate 2 hours Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Methiocarb Mesurol Carbamate Highly toxic
Mexacarbate[22] Zectran Carbamate Highly toxic
Pirimicarb Pirimor, Aphox Carbamate Relatively nontoxic
Propoxur[23] Baygon Carbamate Propoxur is highly toxic to honey bees. The LD50 for bees is greater than one ug/honey bee. Highly toxic
Acephate[24] Orthene Organophosphate 3 days Acephate is a broad-spectrum insecticide and is highly toxic to bees and other beneficial insects.[25] Moderately toxic
Azinphos-methyl[26] Guthion, Methyl-Guthion Organophosphate 2.5 days Banned in EU since 2006.[27] Highly toxic
Chlorpyrifos[28] Dursban, Lorsban Organophosphate Banned in US for home and garden use. Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Coumaphos[29] Checkmite Organophosphate This is an insecticide that is used inside the beehive to combat varroa mites and small hive beetles, which are parasites of the honey bee. Overdoses can lead to bee poisoning. Relatively nontoxic
Demeton Systox Organophosphate <2 hours Highly toxic
Demeton-S-methyl[30] Meta-systox Organophosphate Banned worldwide for toxicity to humans Moderately toxic
Diazinon[31] Spectracide Organophosphate Sale of diazinon for residential use was discontinued in the U.S. in 2004. Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Dicrotophos[32] Bidrin Organophosphate Dicrotophos toxicity duration is about one week.[33] highly toxic
Dichlorvos[34] DDVP, Vapona Organophosphate Highly toxic
Dimethoate[35] Cygon, De-Fend Organophosphate 3 days Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Fenthion[36] Entex, Baytex, Baycid, Dalf, DMPT, Mercaptophos, Prentox, Fenthion 4E, Queletox, Lebaycid Organophosphate Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Fenitrothion[37] Sumithion Organophosphate Highly toxic
Fensulfothion Dasanit Organophosphate Highly toxic
Fonofos[38] Dyfonate EC Organophosphate 3 hours List of Schedule 2 substances (CWC) Highly toxic
Malathion Malathion USB, ~ EC, Cythion, maldison, mercaptothion Organophosphate >8 fl oz/acre (58 L/km2) ⇒ 5.5 days Malathion is highly toxic to bees and other beneficial insects, some fish, and other aquatic life. Malathion is moderately toxic to other fish and birds, and is considered low in toxicity to mammals.[39] Highly toxic
Methamidophos[40] Monitor, Tameron Organophosphate Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Methidathion[41] Supracide Organophosphate Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Methyl parathion Parathion,[42] Penncap-M Organophosphate 5–8 days It is classified as a UNEP persistent organic pollutant and WHO Toxicity Class, "Ia, Extremely Hazardous". Highly toxic
Mevinphos[43] Phosdrin Organophosphate highly toxic
Monocrotophos[44] Azodrin Organophosphate Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Naled[45] Dibrom Organophosphate 16 hours Highly toxic
Omethoate Organophosphate Should never be sprayed on flowering crops especially if bees are active and the crop requires pollination. Highly toxic
Oxydemeton-methyl[46] Metasystox-R Organophosphate <2 hours Highly toxic
Phorate[47] Thimet EC Organophosphate 5 hours Highly toxic
Phosmet[48] Imidan Organophosphate Phosmet is very toxic to honeybees.[49] Highly toxic
Phosphamidon Dimecron Organophosphate Highly toxic
Pyrazophos Afugan Organophosphate Fungicide Highly toxic
Tetrachlorvinphos Rabon, Stirofos, Gardona, Gardcide Organophosphate Highly toxic
Trichlorfon, Metrifonate Dylox, Dipterex Organophosphate 3 – 6 hours Relatively nontoxic
Bifenthrin[50][51] Agri-Medk, Abamectin, Talstar, Bifenthrine, Brigade, Capture, FMC 54800, OMS3024, Torant (with Clofentezine), and Zipak (with Amitraz)[52] Pyrethroid < 1 day RT

> 1 day ERT

 Highly toxic
Permethrin[53] Ambush, Pounce Pyrethroid 1 – 2 days Safened by repellency under arid conditions. Permethrin is also the active ingredient in insecticides used against the Small hive beetle, which is a parasite of the beehive in the temperate climate regions. Highly toxic
Cypermethrin[54] Ammo, Demon, Raid, Viper Pyrethroid Less than 2 hours Cypermethrin is found in many household ant and cockroach killers, including Raid and ant chalk. Highly toxic
Fenvalerate[55] Asana, Pydrin Pyrethroid 1 day Safened by repellency under arid conditions Highly toxic
Resmethrin[56][57][58] Black Flag Mosquito Fog Solution, Chrysron, Crossfire, Pynosect, Raid Flying Insect Killer, Scourge, Sun-Bugger #4, SPB-1382, Synthrin, Syntox, Vectrin, Whitmire PT-110 Pyrethroid Resmethrin is highly toxic to bees, with an LD50 of 0.063 ug/bee. Highly toxic
Methoxychlor[59] DMDT, Marlate Chlorinated cyclodiene 2 hours available as a General Use Pesticide Highly toxic
Endosulfan[60] Thiodan Chlorinated cyclodiene 8 hours Banned in EU (2007?), Banned in NZ (2009) Moderately toxic
Clothianidin Poncho Neonicotinoid Banned in EU for outdoor use since 2018. Highly Toxic[61]
Thiamethoxam Actara Neonicotinoid Banned in EU for outdoor use since 2018. Highly Toxic
Imidacloprid Confidor, Gaucho, Kohinor, Admire, Advantage, K9 Advantix, Merit, Confidor, Hachikusan, Amigo, SeedPlus (Chemtura Corp.), Monceren GT, Premise, Prothor, Winner Neonicotinoid Banned in France since 1999. Banned in EU for outdoor use since 2018. Highly toxic
Fipronil Regent, Goliath, Nexa, Adonis, Termidor, Ultrathor, Fipforce, Taurus, Combat Ant-Rid, Anthem, Clearout, Radiate Phenylpyrazole Banned in EU for use on maize and sunflowers since 2014. Highly toxic
Sulfoxaflor Sulfoximine [62][63]
Dicofol Acaricide Relatively nontoxic
Petroleum oils Relatively nontoxic
2,4-D[64] Weed B Gon (also contains dicamba), ingredient in over 1,500 products Synthetic auxin herbicide Relatively nontoxic

Highly toxic and banned in the US

Regulatory policy

Based on a risks to bee health as identified by the European Food Safety Authority (EFSA), in April 2013 the EU decided to restrict the use of the neonicotinoids thiamethoxam, clothianidin, and imidacloprid.[70] Fipronil was also banned for use on maize and sunflowers.[71]

In 2015, the US Environmental Protection Agency (EPA) proposed to prohibit the application of certain pesticides and herbicides that are known to be toxic to bees during pollination periods when crops are in bloom. Seed treatments were not considered to present a risk to bee health. A modified form of these proposals was adopted as EPA policy in January 2017.[72]

In April 2018, member states of the European Union agreed upon a total ban on neonicotinoid insecticide use, except within closed greenhouses.[73] The vote on the proposed ban followed a February 2018 report from the EFSA which concluded that neonicotinoids posed a high risk to both domestic and wild bees.[74] The ban had strong public support, but faced criticism from the agrochemical industry, and from certain farmers' groups.[75]

In 2020, the EPA supplemented its policy with a proposal to restrict the use of neonicotinoids on residential lawns and turf, but otherwise confirmed that they would remain in use in the US.[76]

General measures to prevent pesticide bee kills

Application of pesticides at evening or night

Avoiding the application of pesticides directly to blooming flowers can help limit the exposure of honeybees to toxic materials. If blooming flowers must be sprayed with pesticides for any reason, they should be sprayed in the evening or night hours when bees are not in the field. The usual foraging hours of honeybees are during the daytime when the temperature is above 55–60 °F (13–16 °C).[2][51][77]

See also

References
  1. "Ministry of Agriculture". Archived from the original on 2015-12-18. Retrieved 2011-02-20.
  2. "Protecting Pollinators from Pesticides - Bees, Beekeeping & Protecting Pollinators". Honey Bee Program. Retrieved July 24, 2021.
  3. Abrol, Dharam P. (5 October 2011). Pollination Biology: Biodiversity Conservation and Agricultural Production. Springer. ISBN 9789400719422.
  4. "Neonicotinoids: risks to bees confirmed | EFSA". www.efsa.europa.eu. 2018-02-28. Retrieved 2023-06-23.
  5. "Conclusion on the peer review of the pesticide risk assessment for bees for the active substance clothianidin". EFSA Journal. 11: 3066. 2013. doi:10.2903/j.efsa.2013.3066.
  6. Carrington, Damian (2018-04-27). "EU agrees total ban on bee-harming pesticides". The Guardian. ISSN 0261-3077. Retrieved 2023-06-23.
  7. Milman, Oliver (2022-03-08). "Fears for bees as US set to extend use of toxic pesticides that paralyse insects". The Guardian. ISSN 0261-3077. Retrieved 2023-06-23.
  8. http://www.agr.wa.gov/pestfert/Pesticides/docs/PollinatorSLNSect18.pdf Archived 2014-10-30 at the Wayback Machine Pollinator protection requirements for Section 18 Emergency Exemptions and Section 24(c) special local need registration in Washington State; Registration Services Program Pesticide Management Division Washington State Dept of Agriculture, Dec 2006-
  9. Sanford 1993.
  10. Hladik, Michelle L.; Main, Anson R.; Goulson, Dave (2018-03-20). "Environmental Risks and Challenges Associated with Neonicotinoid Insecticides". Environmental Science & Technology. 52 (6): 3329–3335. Bibcode:2018EnST...52.3329H. doi:10.1021/acs.est.7b06388. ISSN 0013-936X. PMID 29481746.
  11. "Archived copy" (PDF). Archived from the original (PDF) on 2016-04-23. Retrieved 2016-05-04.{{cite web}}: CS1 maint: archived copy as title (link)
  12. Pisa, Lennard; Goulson, Dave; Yang, En-Cheng; Gibbons, David; Sánchez-Bayo, Francisco; Mitchell, Edward; Aebi, Alexandre; Van Der Sluijs, Jeroen; MacQuarrie, Chris J. K; Giorio, Chiara; Long, Elizabeth Yim; McField, Melanie; Bijleveld Van Lexmond, Maarten; Bonmatin, Jean-Marc (2017). "An update of the Worldwide Integrated Assessment (WIA) on systemic insecticides. Part 2: Impacts on organisms and ecosystems". Environmental Science and Pollution Research. 28 (10): 11749–11797. doi:10.1007/s11356-017-0341-3. PMC 7921077. PMID 29124633.
  13. Desneux, Nicolas; Decourtye, Axel; Delpuech, Jean-Marie (January 2007). "The Sublethal Effects of Pesticides on Beneficial Arthropods". Annual Review of Entomology. 52 (1): 81–106. doi:10.1146/annurev.ento.52.110405.091440. PMID 16842032.
  14. Williamson, Sally M.; Willis, Sarah J.; Wright, Geraldine A. (2014-10-01). "Exposure to neonicotinoids influences the motor function of adult worker honeybees". Ecotoxicology. 23 (8): 1409–1418. doi:10.1007/s10646-014-1283-x. ISSN 1573-3017. PMC 4165879. PMID 25011924.
  15. Czerwinski, Mitchell Andrew; Sadd, Ben Michael (June 2017). "Detrimental interactions of neonicotinoid pesticide exposure and bumblebee immunity". Journal of Experimental Zoology Part A: Ecological and Integrative Physiology. 327 (5): 273–283. doi:10.1002/jez.2087. ISSN 2471-5638. PMID 29356442. S2CID 315073.
  16. Wu, Judy Y.; Anelli, Carol M.; Sheppard, Walter S. (2011-02-23). "Sub-Lethal Effects of Pesticide Residues in Brood Comb on Worker Honey Bee (Apis mellifera) Development and Longevity". PLOS ONE. 6 (2): e14720. Bibcode:2011PLoSO...614720W. doi:10.1371/journal.pone.0014720. ISSN 1932-6203. PMC 3044129. PMID 21373182.
  17. "USDA CCD Report" (PDF).
  18. Radunz, L. and Smith, E. S. C. Pesticides Hazard to Honey Bees Archived 2016-03-03 at the Wayback Machine Entomology, Darwin, Australia
  19. "Carbaryl". Extoxnet. Retrieved July 24, 2021.
  20. "Carbofuran". Extoxnet. August 1, 1994. Retrieved July 24, 2021.
  21. "Methomyl". Extoxnet. Retrieved July 24, 2021.
  22. http://www.scorecard.org/chemical-profiles/summary.tcl?edf_substance_id=315-18-4
  23. "Propoxur". Extoxnet. Retrieved July 24, 2021.
  24. "acephate". Archived from the original on 2008-03-06. Retrieved 2005-02-18.
  25. "Acephate General Fact Sheet" (PDF). National Pesticide Information Center. 2011. Retrieved July 24, 2021.
  26. "Azinphos-methyl". Extoxnet. Retrieved July 24, 2021.
  27. Scott, Alex (August 4, 2008). "Europe Rejects Appeal for Use of Azinphos-methyl Pesticide". Chemical Week. Retrieved 2008-08-11.
  28. "Chlorpyrifos". Extoxnet. Retrieved July 24, 2021.
  29. coumaphos Archived February 5, 2005, at the Wayback Machine
  30. "Demeton-S-methyl". Extoxnet. Retrieved July 24, 2021.
  31. "Diazinon". Extoxnet. Retrieved July 24, 2021.
  32. "Dicrotophos". Extoxnet. Retrieved July 24, 2021.
  33. Clinch, P. G; Palmer-Jones, T; Forster, I. W (1973). "Effect on honey bees of dicrotophos and methomyl applied as sprays to white clover". New Zealand Journal of Experimental Agriculture. 1: 97–9. doi:10.1080/03015521.1973.10427625.
  34. "Dichlorvos". Extoxnet. Retrieved July 24, 2021.
  35. "Dimethoate". Extoxnet. Retrieved July 24, 2021.
  36. "Fenthion". Extoxnet. Retrieved July 24, 2021.
  37. "Fenitrothion". Extoxnet. Retrieved July 24, 2021.
  38. "Fonofos". Extoxnet. Retrieved July 24, 2021.
  39. http://npic.orst.edu/factsheets/malagen.pdf
  40. "ACEPHATE (ORTHENE)". Extoxnet. Retrieved January 26, 2022.
  41. "Methidathion". Extoxnet. Retrieved July 24, 2021.
  42. "Parathion". Extoxnet. Retrieved July 24, 2021.
  43. "Mevinphos". Extoxnet. Retrieved July 24, 2021.
  44. "Monocrotophos". Extoxnet. Retrieved July 24, 2021.
  45. "Naled". Extoxnet. Retrieved July 24, 2021.
  46. "DEMETON-S-METHYL". Extoxnet. Retrieved January 26, 2022.
  47. "Phorate". Extoxnet. Retrieved July 24, 2021.
  48. "Phosmet". Extoxnet. Retrieved July 24, 2021.
  49. http://pmep.cce.cornell.edu/profiles/extoxnet/metiram-propoxur/phosmet-ext.html
  50. "Toxicity of Pesticides to Pollinators and Beneficials". Center for Agriculture, Food and the Environment. January 25, 2017. Retrieved July 24, 2021.
  51. Krupke, Hunt & Foster 2021.
  52. "Bifenthrin". pmep.cce.cornell.edu. Retrieved 2018-09-25.
  53. "Permethrin". Extoxnet. Retrieved July 24, 2021.
  54. "Cypermethrin". Extoxnet. Retrieved July 24, 2021.
  55. "Esfenvalerate". Extoxnet. Retrieved July 24, 2021.
  56. "Resmethrin". Extoxnet. Retrieved July 24, 2021.
  57. "Active Ingredient Fact Sheets" (PDF). National Pesticide Information Center. November 9, 2015. Retrieved July 24, 2021.
  58. MSDS for Scourge' Formula II
  59. "Methoxychlor". Extoxnet. Retrieved July 24, 2021.
  60. "Endosulfan". Extoxnet. Retrieved July 24, 2021.
  61. "EPA Clothianidin Reviews". Archived from the original on 2015-02-25. Retrieved 2011-02-20.
  62. "The National Beekeepers' Association of New Zealand - Submission on Application ERMA200886" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2013-05-18.
  63. Perry, Trent; Chan, Janice Q; Batterham, Phil; Watson, Gerald B; Geng, Chaoxian; Sparks, Thomas C (2012). "Effects of mutations in Drosophila nicotinic acetylcholine receptor subunits on sensitivity to insecticides targeting nicotinic acetylcholine receptors". Pesticide Biochemistry and Physiology. 102: 56–60. doi:10.1016/j.pestbp.2011.10.010.
  64. "2,4-D". Extoxnet. Retrieved July 24, 2021.
  65. "Aldrin". Archived from the original on 2005-02-06. Retrieved 2005-02-18.
  66. "dieldrin". Archived from the original on 2005-02-06. Retrieved 2005-02-18.
  67. "Heptachlor". Extoxnet. Retrieved July 24, 2021.
  68. Moroni, Flavio; Russi, Patrizia; Gallo-Mezo, Miguel Angel; Moneti, Gloriano; Pellicciari, Roberto (1991). "Modulation of Quinolinic and Kynurenic Acid Content in the Rat Brain: Effects of Endotoxins and Nicotinylalanine". Journal of Neurochemistry. 57 (5): 1630–5. doi:10.1111/j.1471-4159.1991.tb06361.x. PMID 1833509. S2CID 12613550.
  69. "Addendum to the 2002 Lindane Reregistration Eligibility Decision (RED)" (PDF). US Environmental Protection Agency. 2006. Retrieved 23 July 2021.
  70. Torello, Alessandro; Haddon, Michael (April 29, 2013). "EU to Restrict 'Bee-Harming' Pesticides". WSJ. Retrieved July 24, 2021.
  71. "Neonicotinoids". ec.europa.eu. Retrieved 2022-04-01.
  72. "Policy Mitigating Acute Risk to Bees from Pesticide Products". US EPA. May 28, 2015. Retrieved July 20, 2021.
  73. "EU to fully ban neonicotinoid insecticides to protect bees". Reuters. 27 April 2018. Retrieved 29 April 2018.
  74. Butler, Declan (February 28, 2018). "EU expected to vote on pesticide ban after major scientific review". Nature. 555 (7695): 150–151. Bibcode:2018Natur.555..150B. doi:10.1038/d41586-018-02639-1.
  75. Carrington D. "EU agrees total ban on bee-harming pesticides". The Guardian. Archived from the original on 27 April 2018. Retrieved 27 April 2018.
  76. "Proposed Interim Registration Review Decision for Neonicotinoids". US EPA. January 30, 2020. Retrieved July 20, 2021.
  77. Ellis, Baxendale & Keith 1998.
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