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Lorsban, Dursban, Chlorpyrifos Pesticide - Dangers and Actions

Chlorpyrifos Pesticide - Dangers and Actions


Chlorpyrifos is an organophosphate pesticide used to kill a number of pests including insects and worms. It is used on crops (such as apples, corn, soybeans and Christmas trees), animals, and buildings. It was introduced in 1965 by Dow Chemical Company. It acts on the nervous system of insects by inhibiting acetylcholinesterase. It has been sold under the brand names Lorsban, Dursban, and others,

Formula: C9H11Cl3NO3PS


The Environmental Protection Agency phased the pesticide out of household use in 2000. It is still allowed in commercial agriculture. Currently, chlorpyrifos remains registered as it undergoes registration review, a program that re-evaluates all pesticides on a 15-year cycle. Registration review ensures pesticides will not cause unreasonable adverse effects when used according to label directions and precautions and that there is a reasonable certainty of no harm from dietary and residential exposure. All documents related to the registration review can be located in the registration review docket EPA-HQ-OPP-2008-0850 located at


People exposed to the pesticide during its use or by drift carried by wind report the immediate symptoms can include nausea, vomiting, diarrhea, abdominal cramps, muscle weakness, muscle twitching, coughing, and wheezing.

There are also concerns of developmental effects in children and in the fetus during pregnancy

Chlorpyrifos also has harmful effects on aquatic life and bees. Aquatic crustaceans and insects appear to be more sensitive to acute exposure than are fish. Concentrated chlorpyrifos released into rivers killed insects, shrimp and fish. In Britain, the rivers Roding

Exposure to chlorpyrifos can be toxic to bees as well.

Food residues: The EPA proposed to eliminate all tolerances for chlorpyrifos ("Because tolerances are the maximum residue of a pesticide that can be in or on food, this proposed rule revoking all chlorpyrifos tolerances means that if this approach is finalized, all agricultural uses of chlorpyrifos would cease.") and asked for comments. The Dow Chemical Company is actively opposed to tolerance restrictions on chlropyrifos and is currently lobbying the White House to, among other goals, pressure EPA to reverse its proposal to revoke chlorpyrifos food residue tolerances.


February 2019: The 9th U.S. Circuit Court of Appeals will hear a case against the EPA on March 25, 2019 to determine whether the EPA has to ban it.

EPA scientists recommended a total ban on the chemical.

References and more information

  1. News story: NPR, Will An Appeals Court Make The EPA Ban A Pesticide Linked To Serious Health Risks? , February, 27, 2019
  2. Lerner, Sharon (2017-01-14). "POISON FRUIT: Dow Chemical Wants Farmers to Keep Using a Pesticide Linked to Autism and ADHD". Retrieved 2017-02-04.
  3. US EPA Chlorpyrifos.
    Chlorpyrifos is an organophosphate insecticide, acaricide and miticide used primarily to control foliage and soil-borne insect pests on a variety of food and feed crops.
  4. - The Facts on Chlorpyrifos - Both the EPA and its critics say science is on their side in the debate over whether the agricultural insecticide should be banned. By Vanessa Schipani, Posted on April 27, 2017
  5. The New York Times - Court Orders E.P.A. to Ban Chlorpyrifos, Pesticide Tied to Children's Health Problems, August 09, 2018
  6. National Geographic - EPA Must Ban Dangerous Insecticide Chlorpyrifos: What Is It?
    Chlorpyrifos has been linked to low IQ and developmental problems in children, but it has been in the environment for a very long time. BY LORI CUTHBERT, PUBLISHED AUGUST 10, 2018
  7. - Did President Trump Reverse an Insecticide Ban After Receiving $1 Million from Dow Chemicals? Examines claims made in Chelsea Handlers tweet.

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Interesting Reads:

THE PREPPER'S CANNING & PRESERVING BIBLE: [13 in 1] Your Path to Food Self-Sufficiency. Canning, Dehydrating, Fermenting, Pickling & More, Plus The Food Preservation Calendar for a Sustainable Pantry

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The Citizens' Guide to Geologic Hazards: A Guide to Understanding Geologic Hazards Including Asbestos, Radon, Swelling Soils, Earthquakes, Volcanoes

The Uninhabitable Earth: Life After Warming

Book: The Sixth Extinction: An Unnatural History Paperback

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