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=1285) 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 1283 0.4 151.9 19.2 - 438.0
2,4 Dimethylaniline 250.0 633 0.3 2245.0 1150.0 - 3340.0
2,4-DMPF 5.0-25.0 598 50.5 124.6 Trace - 1800.0
2,6-Dichlorobenzamide (BAM) 5.0 207 2.9 31.3 Trace - 82.0
4-Hydroxychlorothalonil 10.0 391 0.5 Trace Trace - Trace
4-OH-Chlorothalonil 5.0 207 1.0 Trace Trace - Trace
Acephate 50.0-100.0 1283 0.7 216.3 Trace - 410.0
Acetamiprid 4.0-8.0 1283 2.0 59.4 Trace - 259.0
Acetochlor 15.0-100.0 1283 0.5 70.4 Trace - 103.0
Alachlor 15.0-100.0 1261 0.8 86.3 Trace - 195.0
Aldicarb sulfone 13.0-15.0 1283 0.1 14.0 14.0
Aldicarb sulfoxide 25.0 1283 0.1 35.9 35.9
Atrazine 3.0-4.0 1283 14.7 123.0 Trace - 8600.0
Atrazine CEAT 30.0 191 0.5 Trace Trace*
Atrazine CIAT 30.0 191 1.0 Trace Trace - Trace
Azoxystrobin 2.0-5.0 1284 14.4 45.7 Trace - 1870.0
Bendiocarb 10.0 1076 0.1 15.0 15.0
Benoxacor 15.0 1075 0.2 Trace Trace - Trace
Bifenazate 4.0-15.0 855 0.1 Trace Trace*
Bifenthrin 10.0-25.0 1284 4.1 23.1 Trace - 149.0
Boscalid 5.0-10.0 1283 6.6 379.5 Trace - 3510.0
Bromacil 10.0-20.0 398 0.3 Trace Trace*
Buprofezin 2.0-60.0 791 1.0 38.0 Trace - 155.0
Captan 50.0-125.0 1197 3.8 1084.8 Trace - 13300.0
Carbaryl 2.0-5.0 1283 5.1 386.1 Trace - 6600.0
Carbendazim 25.0 207 21.7 83.7 Trace - 226.0
Carbendazim (MBC) 5.0 1076 5.5 68.3 Trace - 780.0
Chlorantraniliprole 13.0-15.0 562 6.4 192.0 Trace - 2700.0
Chlorfenopyr 5.0-13.0 1231 0.1 Trace Trace*
Chlorfenvinphos 10.0-50.0 985 0.6 53.0 Trace - 75.1
Chlorferone 50.0 777 0.1 192.0 192.0
Chlorothalonil 10.0-100.0 996 9.0 420.0 Trace - 4900.0
Chlorpyrifos 5.0 1284 14.8 25.9 Trace - 303.0
Chlorthal-dimethyl 3.0 207 1.0 Trace Trace - Trace
Clothianidin 8.0-15.0 1283 1.5 38.8 Trace - 177.0
Coumaphos 3.0-5.0 1283 29.5 68.4 Trace - 6260.0
Coumaphos oxon 1.0-2.0 1283 5.1 15.8 Trace - 180.0
Cyflufenamid 2.0 207 1.0 2.0 2.0 - 2.0
Cyfluthrin 10.0-25.0 1193 0.6 28.7 Trace - 58.8
Cyhalothrin total 5.0 1058 5.9 12.5 Trace - 110.0
Cypermethrin 10.0-25.0 1193 0.9 30.8 Trace - 100.0
Cyprodinil 3.0-10.0 1268 6.1 220.0 Trace - 5800.0
DDE p,p' 3.0-5.0 267 0.4 Trace Trace*
DDE p,p’ 5.0 583 0.3 Trace Trace - Trace
DEET 13.0 192 17.7 45.6 Trace - 216.0
Diazinon 15.0-25.0 1283 0.2 15.2 6.6 - 21.1
Dichlorvos (DDVP) 15.0 1076 0.1 205.0 205.0
Dicloran 5.0-25.0 1122 0.1 25.0 25.0
Dicofol 5.0-150.0 1164 0.5 26.0 3.2 - 62.0
Dieldrin 10.0 1023 0.1 12.4 12.4
Difenoconazole 4.0-10.0 1233 1.9 54.2 Trace - 150.0
Diflubenzuron 3.0-5.0 1283 1.9 61.8 Trace - 252.0
Dimethenamid 4.0-10.0 1184 0.7 28.0 Trace - 32.0
Dimethomorph 25.0-75.0 1284 0.2 197.0 Trace - 197.0
Diphenylamine 3.0 207 4.3 Trace Trace - Trace
Diuron 5.0-6.0 398 11.1 13.5 Trace - 59.0
Endosulfan I 10.0-25.0 1284 1.1 37.8 Trace - 124.0
Endosulfan II 10.0-25.0 1263 1.1 26.1 Trace - 72.5
Endosulfan sulfate 10.0-25.0 1284 1.4 14.8 Trace - 56.5
Esfenvalerate 5.0-13.0 1284 1.7 12.3 Trace - 52.0
Ethion 15.0-25.0 1000 1.2 58.9 Trace - 327.0
Ethofenprox 125.0 207 1.4 245.5 Trace - 355.0
Ethofumesate 15.0-20.0 1283 0.2 9.6 5.0 - 14.2
Etoxazole 1.0-5.0 1283 0.2 2.9 Trace - 2.9
Famoxadone 8.0-25.0 1176 0.2 45.0 Trace - 45.0
Fenazaquin 1.0-5.0 398 0.3 1.0 1.0
Fenbuconazole 3.0-15.0 1283 2.8 275.2 Trace - 3470.0
Fenhexamid 9.0-30.0 940 0.4 255.7 7.7 - 814.0
Fenoxaprop-ethyl 4.0-15.0 1241 0.1 35.6 35.6
Fenpropathrin 10.0-25.0 1284 0.5 43.2 20.7 - 93.6
Fenpyroximate 3.0-4.0 1283 5.2 34.2 Trace - 290.0
Flonicamid 15.0-38.0 1283 0.5 130.1 Trace - 370.0
Fludioxonil 10.0-60.0 1283 0.6 52.5 Trace - 73.3
Flumeturon 2.0 207 1.0 Trace Trace - Trace
Fluopicolide 3.0 207 18.8 5.3 Trace - 13.0
Fluopyram 2.0-5.0 562 6.9 19.2 Trace - 95.0
Fluoxastrobin 2.0-5.0 1283 0.4 3.0 Trace - 3.0
Flupyradifurone 5.0-25.0 398 0.5 16.0 Trace - 16.0
Fluridone 1.0-5.0 1262 0.8 1279.0 Trace - 4220.0
Flutolanil 15.0 728 0.8 42.0 Trace - 109.0
Fluvalinate 5.0-25.0 1284 32.4 64.4 Trace - 1930.0
Fluxapyroxad 2.0 207 10.1 5.3 Trace - 14.0
Hexythiazox 1.0-15.0 1253 0.5 35.0 Trace - 54.0
Hydroxychlorothalonil 50.0 685 0.1 59.4 59.4
Imidacloprid 5.0-6.0 1283 2.6 19.5 Trace - 216.0
Indoxacarb 5.0-30.0 1283 0.6 13.0 Trace - 33.0
Iprodione 50.0 910 1.8 171.2 Trace - 503.0
Kresoxim-methyl 3.0-10.0 398 1.0 19.5 5.0 - 46.0
MGK-326 30.0 718 0.3 142.8 95.7 - 190.0
Malathion 10.0-25.0 1258 0.3 55.3 Trace - 79.0
Mandipropamide 2.0-10.0 398 2.0 22.0 Trace - 22.0
Metalaxyl 2.0-5.0 550 0.9 23.5 Trace - 42.0
Metconazole 5.0-10.0 562 0.4 66.0 18.0 - 114.0
Methamidophos 25.0-40.0 1283 0.9 24.8 Trace - 68.0
Methomyl 5.0-25.0 1283 0.2 15.1 7.0 - 23.6
Methoprene 80.0-2500.0 495 0.4 5480.0 5090.0 - 5870.0
Methoxyfenozide 2.0-5.0 1283 4.3 92.4 Trace - 1300.0
Metolachlor 5.0-25.0 995 6.7 161.9 Trace - 2550.0
Metribuzin 5.0-13.0 1232 0.4 5.8 Trace - 8.0
Mgk-264 10.0 207 1.0 16.0 Trace - 16.0
Myclobutanil 8.0-15.0 1283 1.1 327.8 Trace - 1330.0
Novaluron 5.0-30.0 398 1.0 Trace Trace - Trace
Oxyfluorfen 5.0-25.0 1265 1.6 8.6 Trace - 21.0
Paradichlorobenzene 250.0 906 3.4 437.2 Trace - 1820.0
Parathion methyl 10.0-25.0 1284 0.1 6.6 6.6
Pendimethalin 15.0-25.0 1284 6.5 60.1 Trace - 892.0
Penthiopyrad 2.0 207 9.2 9.1 Trace - 33.0
Permethrin total 25.0 1077 0.4 175.6 20.0 - 421.0
Phenothrin 30.0-100.0 1050 0.1 40.0 40.0
Phosmet 50.0 1283 1.0 142.3 Trace - 785.0
Picoxystrobin 2.0 207 3.4 15.8 Trace - 40.0
Piperonyl Butoxide 3.0 207 3.4 19.2 Trace - 26.0
Piperonyl butoxide 15.0 744 0.9 Trace Trace - Trace
Prallethrin 13.0-20.0 1284 1.0 195.7 Trace - 800.0
Prodiamine 20.0-100.0 398 0.3 Trace Trace*
Prometon 3.0 207 1.9 Trace Trace - Trace
Propachlor 13.0-25.0 1277 0.8 1004.9 Trace - 1690.0
Propanil 5.0-10.0 933 0.2 88.0 Trace - 88.0
Propargite 3.0-15.0 900 1.0 4.6 Trace - 7.0
Propazine 5.0-10.0 1273 0.3 26.6 Trace - 34.3
Propham 15.0 1044 0.1 Trace Trace*
Propiconazole 5.0-15.0 884 4.6 60.5 Trace - 415.0
Prothioconazole 125.0 191 2.6 220.0 Trace - 220.0
Pyraclostrobin 3.0-5.0 1283 8.5 138.9 Trace - 1400.0
Pyridaben 3.0-5.0 1283 0.8 15.4 Trace - 52.6
Pyrimethanil 5.0-15.0 1283 2.8 66.5 Trace - 712.0
Pyriproxyfen 3.0-5.0 1283 0.7 10.3 Trace - 32.0
Quinoxyfen 2.0-15.0 937 0.3 9.0 Trace - 16.0
Resmethrin 500.0 207 1.0 3185.0 1480.0 - 4890.0
Sethoxydim 3.0-10.0 1283 0.1 50.2 50.2
Simazine 20.0-50.0 1283 0.5 58.4 Trace - 132.0
Spinosad 15.0 1076 0.2 Trace Trace - Trace
Spirodiclofen 4.0-5.0 1086 0.3 28.0 Trace - 33.0
Spiromesifen 38.0-50.0 896 0.1 Trace Trace*
Spirotetramat 3.0-30.0 398 0.5 40.0 Trace - 40.0
THPI 15.0-125.0 1116 2.2 1821.9 Trace - 8030.0
Tebuconazole 5.0-25.0 1283 3.9 86.8 Trace - 811.0
Tebufenozide 1.0-5.0 1283 0.2 11.8 1.0 - 22.7
Tebuthiuron 3.0-15.0 1283 0.4 4.3 2.2 - 12.1
Tefluthrin 5.0 1284 0.1 Trace Trace*
Thiabendazole 5.0 1283 0.9 5.0 Trace - 26.0
Thiacloprid 3.0-5.0 1283 0.3 120.6 29.0 - 326.0
Thiamethoxam 10.0 1283 1.2 13.0 Trace - 39.6
Thymol 25.0-50.0 1283 20.7 2192.7 Trace - 55800.0
Tribufos (DEF) 10.0 876 0.2 130.0 Trace - 130.0
Trifloxystrobin 1.0-10.0 1212 5.7 53.6 Trace - 638.0
Trifluralin 5.0-13.0 1284 4.5 75.4 Trace - 510.0
Triticonazole 15.0-30.0 925 0.4 310.8 135.0 - 483.0
Vinclozolin 5.0 1284 0.4 9.2 Trace - 15.0
cyhalothrin lambda 25.0 207 2.4 32.0 Trace - 32.0

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

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