DEEP: How Poisonous Are Pesticides

How Poisonous Are Pesticides

This is a summary of the toxicity of certain insecticides to test animals (usually the white rat) based on the amount of chemical that would need to be eaten at one time to cause death.

Insecticide Acute oral LD50 to rats
(mg/kg)
Approximate ingested lethal dose for humans (concentrated chemical)
aldicarb (Temik) 0.93  
Disyston 2.7  
oxamyl (Vydate) 4.7 1/70 to 1/5 teaspoonful
fenaminphos (Nemacur) 8  
abamectin (Avert) 10  
azinphosmethyl (Guthion) 11-13  
methomyl (Lannate) 17  
endothall 38-51 1/5 to teaspoonful
dichlorvos (DDVP or Vapona) 50  
nicotine 50-60  
bifenthrin (Talstar) 55  
Metasystox R 65-75 to 1-1/2 teaspoonfuls
lambda-Cyhalothrin(Scimitar, Demand) 79  
chlorpyrifos (Dursban) 97-276 1-1/2 to 3 teaspoonfuls
fipronil 100  
endosulfan (Thiodan) 100  
Rotenone 132-1500  
trichlorfon (Dylox) 144  
imidan 216  
cypermethrin (Cynoff, Demon, ) 247-250  
2,4-D 375  
Diazinon (Knox-out) 300-400  
naled (Dibrom) 430  
imidacloprid (Merit) 450 3 to 9 teaspoonfuls
cyfluthrin (Tempo) 500  
carbaryl (Sevin) 540-800  
MSMA 700  
acephate (Orthene) 866-945  
pendimethalin 1050  
malathion 1500  
propiconazole (Banner) 1517  
DEET (Off) 2000  
oxythioquinox (Morestan) 2500  
permethrin (Dragnet, Flee) 430-4000 to 1 cup
glyphosate (Roundup) 5600  
dithiopyr (Dimension) >5000  
Resmethrin 715-10,200 1-1/2 to over 3 cups
chlorothalonil (Daconil) >10,000  
fosamine ammonium (Krenite) 24,000  

For more information, please call the Pesticide Management Program at (860) 424-3369 or email the deep.pesticideprogram@ct.gov or write to:

Department of Energy and Environmental Protection
Bureau of Materials Management and Compliance Assurance
Pesticide Management Program
79 Elm Street
Hartford, CT 06106-5127

Pesticide Certification

 Content Last Updated on November 29, 2011