National Honey Bee Survey Bee Bread Pesticide Sampling Report

Further sampling summary information can be found at the USDA APHIS National Honey Bee Survey Report page. This report lists the level of detection (LOD) and the prevalence (percentage that the pesticide occurred) in all samples taken across the country as part of pollen sampling since 2011. For example, if the prevalence value for a pesticide is given as “10”, the pesticide was detected in 10% of all samples received. Finally, this table also provides the average and the range in ppb (parts per billion) of pesticides found in all of the samples.

Pesticide samples were collected from stored pollen (bee bread) in brood comb and processed at the USDA Agriculture Marketing Service (USDA-AMS). Sampling from bee bread was done from 2011 to 2017. From 2017 to present, the pesticide sampling protocol uses wax. Access the wax sampling report here.

United States Department of Agriculture


The Bee Informed Partnership
at beeinformed.org
funded by USDA National Institute of Food and Agriculture

Apiary Inspectors of America



Table: Prevalence of Pesticides found in all samples (n=1547) analyzed for the National Honey Bee disease survey.

Pesticide Detected LOD (ppb) # Samples Prevalence (%) Average Level (ppb) Level Range
1-Naphthol 50.0-500.0 1545 0.3 151.9 19.2 - 438.0
2,4 Dimethylaniline 250.0 633 0.3 2245.0 1150.0 - 3340.0
2,4-DMPF 5.0-25.0 860 53.8 132.5 Trace - 1800.0
2,6-Dichlorobenzamide (BAM) 5.0 469 2.1 19.5 Trace - 82.0
4-Hydroxychlorothalonil 10.0 391 0.5 Trace Trace - Trace
4-OH-Chlorothalonil 5.0 434 0.7 14.0 Trace - 14.0
Acephate 50.0-100.0 1545 0.6 216.3 Trace - 410.0
Acetamiprid 4.0-8.0 1545 2.2 43.6 Trace - 259.0
Acetochlor 15.0-100.0 1545 0.6 70.4 Trace - 103.0
Alachlor 15.0-100.0 1523 0.7 86.3 Trace - 195.0
Aldicarb sulfone 13.0-15.0 1545 0.1 14.0 14.0
Aldicarb sulfoxide 25.0 1488 0.1 35.9 35.9
Atrazine 3.0-4.0 1545 15.8 99.2 Trace - 8600.0
Atrazine CEAT 30.0 191 0.5 Trace Trace*
Atrazine CIAT 30.0 191 1.0 Trace Trace - Trace
Azinphos methyl 15.0-25.0 1498 0.1 102.5 91.0 - 114.0
Azoxystrobin 2.0-5.0 1489 16.9 38.1 Trace - 1870.0
Bendiocarb 10.0 1076 0.1 15.0 15.0
Benoxacor 15.0 1075 0.2 Trace Trace - Trace
Bifenazate 4.0-15.0 1098 0.4 65.5 Trace - 92.0
Bifenthrin 10.0-25.0 1546 4.3 31.2 Trace - 371.0
Boscalid 5.0-10.0 1545 6.5 333.6 Trace - 3510.0
Bromacil 10.0-20.0 660 0.3 15.0 Trace - 15.0
Buprofezin 2.0-60.0 1053 1.7 19.7 Trace - 155.0
Captan 50.0-125.0 1459 3.7 1330.0 Trace - 13300.0
Carbaryl 2.0-5.0 1545 4.9 333.2 Trace - 6600.0
Carbendazim 25.0 469 15.6 83.1 Trace - 246.0
Carbendazim (MBC) 5.0 1076 5.5 68.3 Trace - 780.0
Chlorantraniliprole 13.0-15.0 824 5.5 189.1 Trace - 2700.0
Chlorfenopyr 5.0-13.0 1493 0.1 Trace Trace*
Chlorfenvinphos 10.0-50.0 1247 0.5 53.0 Trace - 75.1
Chlorferone 50.0 777 0.1 192.0 192.0
Chlorothalonil 10.0-100.0 1258 9.8 612.8 Trace - 13900.0
Chlorpyrifos 5.0 1544 13.0 25.2 Trace - 303.0
Chlorthal-dimethyl 3.0 469 1.3 Trace Trace - Trace
Clothianidin 8.0-15.0 1545 1.4 37.3 Trace - 177.0
Coumaphos 3.0-5.0 1545 26.5 85.1 Trace - 6260.0
Coumaphos oxon 1.0-5.0 1535 5.0 20.7 Trace - 337.0
Cyazofamid 1.0-30.0 660 0.2 Trace Trace*
Cyflufenamid 2.0-13.0 469 0.4 2.0 2.0 - 2.0
Cyfluthrin 2.0-25.0 1455 0.5 28.7 Trace - 58.8
Cyhalothrin total 5.0 1058 5.9 12.5 Trace - 110.0
Cypermethrin 8.0-25.0 1455 0.8 30.8 Trace - 100.0
Cyprodinil 3.0-25.0 1515 6.1 194.2 Trace - 5800.0
DDE p,p' 3.0-1000.0 529 0.4 Trace Trace - Trace
DDE p,p’ 5.0 583 0.3 Trace Trace - Trace
DEET 13.0 407 35.6 38.9 Trace - 216.0
Diazinon 13.0-25.0 1545 0.2 15.2 6.6 - 21.1
Dichlorvos (DDVP) 15.0 1076 0.1 205.0 205.0
Dicloran 4.0-25.0 1384 0.1 25.0 25.0
Dicofol 5.0-150.0 1426 0.4 26.0 3.2 - 62.0
Dieldrin 10.0 1023 0.1 12.4 12.4
Difenoconazole 4.0-25.0 1495 2.1 36.4 Trace - 150.0
Diflubenzuron 3.0-150.0 1545 2.1 48.6 Trace - 252.0
Dimethenamid 4.0-10.0 1446 0.8 14.0 Trace - 32.0
Dimethomorph 4.0-75.0 1546 0.1 197.0 Trace - 197.0
Diphenylamine 3.0-25.0 469 4.7 9.2 Trace - 17.0
Diuron 3.0-6.0 660 10.8 20.4 Trace - 279.0
Endosulfan I 3.0-25.0 1546 0.9 37.8 Trace - 124.0
Endosulfan II 5.0-25.0 1525 0.9 26.1 Trace - 72.5
Endosulfan sulfate 10.0-25.0 1546 1.2 14.8 Trace - 56.5
Esfenvalerate 5.0-25.0 1546 1.6 12.9 Trace - 52.0
Ethion 4.0-25.0 1262 1.0 58.9 Trace - 327.0
Ethofenprox 13.0-125.0 469 0.9 245.5 Trace - 355.0
Ethofumesate 15.0-25.0 1545 0.1 9.6 5.0 - 14.2
Etoxazole 1.0-125.0 1545 0.4 1.9 Trace - 2.9
Famoxadone 8.0-25.0 1438 0.1 45.0 Trace - 45.0
Fenazaquin 1.0-25.0 660 0.6 5.8 1.0 - 11.0
Fenbuconazole 3.0-25.0 1545 2.6 243.4 Trace - 3470.0
Fenhexamid 1.0-30.0 1202 0.3 255.7 7.7 - 814.0
Fenoxaprop-ethyl 3.0-15.0 1503 0.1 35.6 35.6
Fenpropathrin 9.0-25.0 1546 0.4 43.2 20.7 - 93.6
Fenpyroximate 3.0-4.0 1545 4.9 33.2 Trace - 290.0
Flonicamid 5.0-38.0 1545 0.4 130.1 Trace - 370.0
Fludioxonil 10.0-60.0 1545 0.8 42.1 Trace - 73.3
Flumeturon 2.0-38.0 469 0.4 Trace Trace - Trace
Fluopicolide 3.0-10.0 469 8.5 5.5 Trace - 13.0
Fluopyram 2.0-5.0 824 8.3 27.7 Trace - 323.0
Fluoxastrobin 2.0-5.0 1545 0.3 3.0 Trace - 3.0
Flupyradifurone 2.0-25.0 660 0.9 12.7 Trace - 16.0
Fluridone 1.0-5.0 1524 0.8 1279.0 Trace - 4220.0
Flutolanil 15.0 728 0.8 42.0 Trace - 109.0
Fluvalinate 1.0-25.0 1546 27.5 64.3 Trace - 1930.0
Fluxapyroxad 2.0-5.0 469 8.7 10.6 Trace - 70.0
Hexazinone 1.0-10.0 660 0.6 2.0 Trace - 2.0
Hexythiazox 1.0-25.0 1490 0.6 16.8 Trace - 54.0
Hydroxychlorothalonil 50.0 685 0.1 59.4 59.4
Imidacloprid 1.0-6.0 1545 2.3 19.5 Trace - 216.0
Indoxacarb 1.0-30.0 1545 0.5 13.0 Trace - 33.0
Iprodione 10.0-50.0 1172 1.6 171.2 Trace - 503.0
Kresoxim-methyl 3.0-10.0 660 0.6 19.5 5.0 - 46.0
MGK-326 30.0 718 0.3 142.8 95.7 - 190.0
Malathion 10.0-50.0 1520 0.4 84.2 Trace - 199.0
Mandipropamide 2.0-10.0 660 1.4 14.5 Trace - 22.0
Metalaxyl 2.0-13.0 812 0.9 23.5 Trace - 42.0
Metconazole 5.0-25.0 824 0.2 66.0 18.0 - 114.0
Methamidophos 2.0-40.0 1545 0.8 24.8 Trace - 68.0
Methomyl 5.0-25.0 1545 0.2 15.1 7.0 - 23.6
Methoprene 25.0-2500.0 757 0.5 10315.0 5090.0 - 17000.0
Methoxyfenozide 2.0-5.0 1545 4.9 71.6 Trace - 1300.0
Metolachlor 5.0-25.0 1257 8.5 156.3 Trace - 2550.0
Metribuzin 5.0-2500.0 1494 0.9 59.4 Trace - 121.0
Mgk-264 2.0-10.0 469 0.4 16.0 Trace - 16.0
Myclobutanil 8.0-15.0 1545 1.0 327.8 Trace - 1330.0
Novaluron 5.0-30.0 660 1.2 11.5 Trace - 12.0
Oxyfluorfen 5.0-25.0 1527 1.4 11.7 Trace - 48.0
Paradichlorobenzene 250.0 906 3.4 437.2 Trace - 1820.0
Parathion methyl 10.0-25.0 1546 0.1 6.6 6.6
Pendimethalin 15.0-25.0 1546 6.0 59.4 Trace - 892.0
Penthiopyrad 2.0-25.0 469 7.2 7.4 Trace - 33.0
Permethrin 2.0-25.0 469 0.2 364.0 364.0
Permethrin total 25.0 1077 0.4 175.6 20.0 - 421.0
Phenothrin 25.0-100.0 1312 0.1 40.0 40.0
Phosmet 50.0-100.0 1545 0.9 206.5 Trace - 913.0
Picoxystrobin 2.0-25.0 469 2.3 21.5 Trace - 63.0
Piperonyl Butoxide 3.0-50.0 469 5.8 15.7 Trace - 26.0
Piperonyl butoxide 15.0 744 0.9 Trace Trace - Trace
Prallethrin 1.0-20.0 1546 0.8 195.7 Trace - 800.0
Prodiamine 2.0-100.0 660 0.2 Trace Trace*
Prometon 3.0-13.0 469 2.1 4.0 Trace - 4.0
Propachlor 13.0-25.0 1507 0.7 1004.9 Trace - 1690.0
Propanil 3.0-10.0 1195 0.6 37.0 Trace - 88.0
Propargite 3.0-25.0 1162 1.4 20.2 Trace - 104.0
Propazine 5.0-13.0 1535 0.3 26.6 Trace - 34.3
Propham 15.0 1044 0.1 Trace Trace*
Propiconazole 3.0-15.0 1146 4.6 53.1 Trace - 415.0
Prothioconazole 125.0 191 2.6 220.0 Trace - 220.0
Pyraclostrobin 3.0-5.0 1545 9.6 109.3 Trace - 1400.0
Pyridaben 3.0-5.0 1545 0.8 13.4 Trace - 52.6
Pyrimethanil 5.0-250.0 1545 3.2 3444.3 Trace - 124000.0
Pyriproxyfen 3.0-5.0 1545 1.1 10.1 Trace - 32.0
Quinoxyfen 2.0-15.0 1199 0.3 9.0 Trace - 16.0
Resmethrin 3.0-500.0 469 0.4 3185.0 1480.0 - 4890.0
Sethoxydim 2.0-10.0 1545 0.1 50.2 50.2
Simazine 5.0-50.0 1545 0.6 57.2 Trace - 132.0
Spinosad 15.0 1076 0.2 Trace Trace - Trace
Spirodiclofen 4.0-500.0 1286 0.4 38.3 Trace - 59.0
Spiromesifen 38.0-50.0 1140 0.1 Trace Trace*
Spirotetramat 3.0-30.0 660 0.3 40.0 Trace - 40.0
Sulfoxaflor 4.0-25.0 660 0.2 Trace Trace*
THPI 5.0-125.0 1378 2.5 1766.4 Trace - 8030.0
Tebuconazole 5.0-38.0 1545 3.6 103.8 Trace - 811.0
Tebufenozide 1.0-5.0 1545 0.1 11.8 1.0 - 22.7
Tebuthiuron 3.0-15.0 1545 0.3 4.3 2.2 - 12.1
Tefluthrin 5.0-25.0 1546 0.1 Trace Trace*
Thiabendazole 5.0 1545 0.8 5.0 Trace - 26.0
Thiacloprid 3.0-10.0 1545 0.3 120.6 29.0 - 326.0
Thiamethoxam 10.0-125.0 1545 1.1 13.0 Trace - 39.6
Thymol 3.0-50.0 1545 20.1 2199.4 Trace - 55800.0
Tribufos (DEF) 10.0 876 0.2 130.0 Trace - 130.0
Trifloxystrobin 1.0-10.0 1474 7.9 44.3 Trace - 638.0
Triflumizole 2.0-40.0 1152 0.1 12.0 12.0
Trifluralin 2.0-13.0 1546 4.5 75.4 Trace - 510.0
Triticonazole 13.0-30.0 1187 0.3 310.8 135.0 - 483.0
Vinclozolin 1.0-5.0 1546 0.3 9.2 Trace - 15.0
cyhalothrin lambda 10.0-25.0 469 2.6 42.0 Trace - 52.0

*Only a single detection made for this pesticide.

USDA-AMS tests for a broad spectrum of pesticides deemed possible to discover in honey bee colonies. The list of pesticides changes over time as new pesticides are introduced to market, and others are deemed to be unlikely to detect. Below is the list of all pesticides that have been tested for (n = 303), including substances not detected in any samples.

Mefenoxam,  Esfenvalerate/Fenvalerate,  Chlorpropham,  Carbendazim,  Avermectin,  Tetradiafon,  Quintozine,  Piperonyl Butoxide,  Phosmet Oa,  Parathion,  Norflurazon Desmethyl,  Mgk-264,  Flumeturon,  Ethofenprox,  cyhalothrin lambda,  Chlorthal-dimethyl,  Bentazone,  4-OH-Chlorothalonil,  3-hydroxycarbofuran,  2,4-DMPF,  2,6-Dichlorobenzamide (BAM),  2,4 Dimethylaniline,  4,4 Dibromobenzophenone,  Acrinathrin,  Ametoctradin,  Azinphos-methyl,  Bensulide,  Bentazon,  BHC-alpha,  BHC-beta,  BHC-delta,  BHC-gamma,  Bromopropylate,  Carfentrazone-ethyl,  Chlorfenapyr,  Chlorothalonil-4-OH,  Chlorthal-dimethyl (DCPA),  Chlorferone,  Cyflufenamid,  Cyflumetofen,  Cyhalothrin,  Cymiazole,  Cymoxanil,  DDD pp',  DDT, p,p',  DEET,  Dichlorvos,  DDE, p,p',  Diphenylamine,  Alpha-endosulfan,  Beta-endosulfan,  Fenvalerate,  Fenoxaprop-p-ethyl,  Endosulfan sulfate,  Fluopicolide,  Flutriafol,  Fluxapyroxad,  Hexachlorobenzene,  Imidacloprid-5-hydroxy,  Isoprocarb,  Momfluorothrin,  Penconazole,  Penthiopyrad,  Permethrin,  Cispermethrin,  Transpermethrin,  Phosmet oxon,  Picoxystrobin,  Pirimiphos-methyl,  Prometon,  Prometryn,  Propamocarb hydrochloride,  Pyrethrins (cinerin I),  Quintozene,  Resmethrin,  Resmethrin, cis,  Resmethrin, trans,  Spinosyn A,  Spinosyn D,  Tetrachlorvinphos (Dietreen T),  THPI,  Triazophos,  Tribufos,  1-Naphthol,  2,4 Dimethylphenyl formamide (DMPF),  3-Hydroxycarbofuran,  4-Aminopyridine,  4-Hydroxychlorothalonil,  Abamectin,  Acephate,  Acetamiprid,  Acetochlor,  Alachlor,  Aldicarb,  Aldicarb sulfone,  Aldicarb sulfoxide,  Aldrin,  Allethrin,  Amicarbazone,  Amitraz,  Clofentezine,  Atrazine,  Atrazine CEAT,  Atrazine CIAT,  Azinphos methyl,  Azoxystrobin,  BHC alpha,  Bendiocarb,  Benfluralin,  Benoxacor,  Bifenazate,  Bifenthrin,  Boscalid,  Bromacil,  Bromuconazole,  Buprofezin,  Captan,  Carbaryl,  Carbendazim (MBC),  Carbofuran,  Carboxin,  Carfentrazone ethyl,  Chlorantraniliprole,  Chlorfenopyr,  Chlorfenvinphos,  Chlorothalonil,  Chlorpropham (CIPC),  Chlorpyrifos,  Chlorpyrifos methyl,  Clothianidin,  Coumaphos,  Coumaphos oxon,  Cyantraniliprole,  Cyazofamid,  Cyfluthrin,  Cyfluthrin total,  Cyhalothrin total,  Cypermethrin,  Cypermethrin total,  Cyphenothrin,  Cyprodinil,  Cyromazine,  DDD p,p',  DDT o,p',  DDT p,p',  Deltamethrin,  Diazinon,  Diazinon oxon,  Dichlorvos (DDVP),  Diclofop-methyl,  Dicloran,  Dicofol,  Dieldrin,  Difenoconazole,  Diflubenzuron,  Dimethenamid,  Dimethoate,  Dimethomorph,  Dinotefuran,  Diphenamid,  Diuron,  Emamectin Benzoate,  Endosulfan I,  Endosulfan II,  Endrin,  Epoxiconazole,  Esfenvalerate,  Ethalfluralin,  Ethion,  Ethofumesate,  Etofenprox,  Etoxazole,  Etridiazole,  Famoxadone,  Fenamidone,  Fenarimol,  Fenazaquin,  Fenbuconazole,  Fenhexamid,  Fenoxaprop-ethyl,  Fenpropathrin,  Fenpyroximate,  Fenthion,  Fipronil,  Fipronil sulfide,  Fipronil sulfone,  Flonicamid,  Flubendiamide,  Fludioxonil,  Fluometuron,  Fluopyram,  Fluoxastrobin,  Flupyradifurone,  Fluridone,  Flutolanil,  Fluvalinate,  Formetanate,  Heptachlor,  Heptachlor epoxide,  Hexachlorobenzene (HCB),  Hexazinone,  Hexythiazox,  Hydroprene,  Hydroxychlorothalonil,  Imazalil,  Imidacloprid,  Imidacloprid 5-hydroxy,  Imidacloprid olefin,  Indoxacarb,  Iprodione,  Kresoxim-methyl,  Lindane,  Linuron,  MGK-264,  MGK-326,  Malathion,  Mandipropamide,  Mesotrione,  Metalaxyl,  Metalaxyl Total,  Metconazole,  Methamidophos,  Methidathion,  Methiocarb,  Methomyl,  Methoprene,  Methoxyfenozide,  Metolachlor,  Metribuzin,  Myclobutanil,  Naled,  Norflurazon,  Norflurazon desmethyl,  Novaluron,  Omethoate,  Oxamyl,  Oxyfluorfen,  Paradichlorobenzene,  Parathion ethyl,  Parathion methyl,  Pendimethalin,  Permethrin total,  Phenothrin,  Phorate,  Phosalone,  Phosmet,  Phosmet OA,  Piperonyl butoxide,  Pirimiphos methyl,  Potasan,  Prallethrin,  Prodiamine,  Profenofos,  Pronamide,  Propachlor,  Propanil,  Propargite,  Propazine,  Propetamphos,  Propham,  Propiconazole,  Prothioconazole,  Pymetrozine,  Pyraclostrobin,  Pyrethrins,  Thiamethoxam,  Pyridaben,  Pyrimethanil,  Pyriproxyfen,  Quinoxyfen,  Quintozene (PCNB),  Resmethrin total,  Sethoxydim,  Simazine,  Spinetoram,  Spinosad,  Spirodiclofen,  Spiromesifen,  Spirotetramat,  Sulfoxaflor,  Tebuconazole,  Tebufenozide,  Tebuthiuron,  Tefluthrin,  Tetrachlorvinphos,  Tetraconazole,  Tetradifon,  Tetramethrin,  Thiabendazole,  Thiacloprid,  Thymol,  Tolfenpyrad,  Triadimefon,  Triadimenol,  Tribufos (DEF),  Trifloxystrobin,  Triflumizole,  Trifluralin,  Triticonazole,  Vinclozolin,  DDE p,p’,  DDE p,p,  DDE p,p', 

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