Table of Insecticides and Miticides


Table of Insecticides and Miticides

Table1 of common insecticides and miticides and their relative risk to honey bees. Never spray during bloom periods unless it is absolutely necessary. If treatment is unavoidable, choose a product with a high LD50 and short residual. If a more toxic chemical is required, choose a residual under 8 hours and spray at night.


Active Ingredient Trade Names Risk Class2 LD503 Residual4

Acephate Orthene I 1.2 1 day to >3 days

Aldicarb Temik I 0.35 >1 day to >2 days

azinphos methyl Guthion I 0.43 2 days to >5 days

Bacillus thuringiensis Biobit, Cutlass, Dipel, Javelin, Thuricide III NA <2 hours

Carbaryl Sevin I 1.5 to 26.5 <2 hours to 12 days

Chlorpyrifos Dursban, Lorsban I 0.11 5 hours to 6 days

Cyhexatin Plictran III NA <2 hours

cypermethrin Ammo, Cymbush III NA 3 days

Diazinon Diazinon I 0.37 <1 day to 2 days

Dicofol Kelthane III NA <2 hours

dicrotophos Bidrin I 0.3 1 day to 1 days

diflubenzuron Dimilin III NA <2 hours to 6 hours

dimethoate Cygon, De-fend, Rebelate I 0.19 3 days

disulfoton Di-syston II 6.12 <2 hours to 7 hours

endosulfan Thiodan II 7.8 <2 hours to 1 day

Ethion Ethion oil III NA <2 hours

fluvalinate Mavrik III 65.8 <2 hours

fonofos Dyfonate II 8.68 <2 hours to 6 hours

formetanate hydrochloride Carzol II 9.2 <2 hours to 2 hours

Lindane Lindane I NA >2 days

malathion Cythion, Malathion I 0.73 <2 hours to 5 days

methamidophos Monitor I 1.37 4 hours to 1 day

methidathion Supracide I 0.24 day to 3 days

methomyl Lannate I 1.29 1 day

methoxychlor Marlate, Methoxychlor III NA <2 hours

oxythioquniox Morestan III NA <2 hours

parathion Parathion I 0.18 10 hours to >1 day

permethrin Ambush, Permethrin, Pounce I 0.16 12 hours to >3 days

phorate Thimet II 10.25 <2 hours to 5 hours

phosmet Imidan I 1.13 8 hours to >3 days

profenofos Curacron II 3.46 <2 hours to 9 hours

propargite Omite, Ornamite III NA <2 hours

sulprofos Bolstar II 7.22 1 day

thiodicarb Larvin II 7.08 <2 hours

trichlorfon Dylox, Proxol III NA <2 hours to 6 hours

1-Table modified from Johansen & Mayer (1990) and Delaplane (1993).

2-Risk classes: I = highly toxic to honey bees, II = moderately toxic to honey bees, III = relatively nontoxic to honey bees. The risk class is closely associated with the LD50.

3-LD50 = the Lethal Dose required to kill 50% of the test honey bees, expressed in micrograms per bee. The smaller the LD50, the more toxic the product.

4-Period of residual toxicity to honey bees after application. Evening applications of products with residuals of 8 hours or less generally cause only moderate harm to bees, even if the LD50 is small. For example, mevinphos is very toxic to bees, but because it has a short residual, it is fairly safe for early evening applications.


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