Hey farm gals, it’s Kara from Lange Girl Farms!
I started the morning checking on the pregnant mini mare, making sure she had calm time on fresh pasture while I hand-weeded near the herbs and torched a couple of early weed patches along the fence. The Siberian huskies were racing around in their own safe space, the llamas and alpacas kept their steady watch, and the chickens and ducks stayed busy in their secure run. These quiet, chemical-free mornings are everything. They remind me why we refuse nerve toxins like organophosphates and chlorpyrifos on this regenerative homestead.
In Part 1 we looked at the wake-up call — lingering use despite restrictions and the serious neurological risks. Now in Part 2 we’re going full nerd on what organophosphates actually are, how they work as nerve agents, why chlorpyrifos became so widely used (and controversial), and how they compare to the other chemicals we’ve covered. This is the foundation so you understand exactly why we say no to them entirely.
What Are Organophosphates?
Organophosphates (OPs) are a class of insecticides (and some herbicides/nerve agents) that contain phosphorus. The most well-known in agriculture include:
• Chlorpyrifos (often sold as Lorsban or Dursban)
• Malathion
• Diazinon
• Methyl parathion (phased out in many uses)
They were originally developed from wartime nerve gas research during and after World War II. Chlorpyrifos, in particular, was commercialized in the 1960s and became one of the most heavily used insecticides in the U.S. for decades on corn, soybeans, almonds, citrus, and many vegetables.
How They Work: Inhibiting Acetylcholinesterase (The Nerve Agent Mechanism)
Organophosphates are acetylcholinesterase inhibitors. Here’s the step-by-step process:
1. Normal nerve signaling: Acetylcholine is a neurotransmitter released at nerve junctions to transmit signals. After the signal is sent, the enzyme acetylcholinesterase (AChE) quickly breaks down acetylcholine so the nerve can reset.
2. OP binding: The organophosphate molecule binds irreversibly (or very tightly) to the active site of AChE, disabling the enzyme.
3. Acetylcholine buildup: Without functional AChE, acetylcholine accumulates at nerve endings.
4. Overstimulation: Nerves fire continuously, causing muscle twitching, spasms, paralysis, and eventually respiratory failure if exposure is high enough.
This is the same basic mechanism used in chemical warfare nerve agents (like sarin). In insects it kills quickly. In mammals (including humans and livestock) it causes the same overstimulation — just at different dose levels.
Chlorpyrifos is particularly effective because it is lipophilic (fat-soluble), allowing it to cross biological membranes easily, including into the brain.
Acute vs. Chronic Exposure Risks
• Acute poisoning: High exposure causes immediate symptoms — salivation, lacrimation, urination, diarrhea, muscle twitching, seizures, and potentially death. Farmworkers and applicators are at highest risk.
• Chronic / low-level exposure: Even below levels causing obvious poisoning, organophosphates are linked to:
• Neurodevelopmental harm in children (lower IQ, attention deficits, autism spectrum risks)
• Neurological effects in adults (memory issues, tremors, Parkinson’s-like symptoms)
• Reproductive problems and developmental abnormalities in livestock
This is why we’re especially protective of our pregnant mini mare — her forage and environment stay completely free of these nerve toxins.
How They Compare to the Other Chemicals We’ve Covered
• Glyphosate: Systemic enzyme inhibitor (shikimate pathway), slower, targets plants and gut bacteria.
• Paraquat: Contact killer via redox cycling and ROS explosion, extremely acute toxicity.
• Atrazine: Photosystem II inhibitor, persistent in water, endocrine disruptor.
• 2,4-D / Dicamba: Synthetic auxins causing uncontrolled plant growth, volatile.
• Neonicotinoids: Systemic nicotinic receptor agonists, highly toxic to insects and pollinators.
• Organophosphates (Chlorpyrifos): Irreversible acetylcholinesterase inhibitors — true nerve agents that overstimulate the nervous system in insects, mammals, and birds.
The big difference with OPs is their direct attack on the nervous system, making them among the most acutely toxic pesticides still in agricultural use.
Why “Effective” Nerve Toxins Don’t Fit Regenerative Homesteads
Big ag has used organophosphates for quick knockdown of pests, but on our homestead we refuse them entirely. We hand-weed, torch weeds, plant cover crops, and support beneficial insects because those methods build a balanced ecosystem instead of poisoning the nervous systems of everything they touch. Our pregnant mini mare grazes clean pasture we’ve built without these risks. Our huskies, llamas, alpacas, chickens, and ducks live without the neurological burden these chemicals carry.
The history of organophosphates — from wartime nerve agents to farm chemicals — shows why we choose the regenerative path.
Series Roadmap – What’s Coming Next
Part 3: The devastating toll on humans (neurodevelopmental harm), livestock (especially pregnant animals), wildlife, and waterways.
Part 4: On our plates – residues in crops, animal products, and the cumulative load.
Part 5: Follow the money – manufacturers, lawsuits, and regulatory battles (including EPA actions and court fights).
Part 6: The roots – discovery, military origins of organophosphates, and the shift to agricultural use. (Wait — this was already covered in the previous message, but it fits here as planned.)
Part 7: Reclaiming our land – our exact holistic methods (hand-weeding, torch burning, mulch, cover crops, livestock grazing with our mini horses and llamas/alpacas), Michigan-specific tips, and how we manage pests without nerve toxins.
Pin this post and the series. Drop a comment: Have you worried about organophosphate exposure near your property? Are you already avoiding treated crops or feed? I read every comment.
If you want to support a farm refusing these chemicals entirely, swing by the shop for our wildcrafted salves (great after hand-weeding or torch work), herbal teas grown right here without sprays, or non-GMO seeds for your own regenerative garden. Every purchase helps us keep protecting our land and animals.
We don’t have to accept nerve toxins in agriculture. We can protect our nervous systems and our future—one holistic choice at a time.
See you in Part 3, farm gals!
With love from the pasture,
Kara
Lange Girl Farms
