Modern agriculture relies on chemical warfare against insects, but at what ecological cost?

Nature · Published 30 September 2026 Swipe more like this →

In short: Insecticides are essential tools for protecting crops and controlling disease, yet their history is a complex evolution of chemistry. From early stomach poisons to the systemic power of neonicotinoids, these substances have reshaped global food production while sparking intense debate over their long-term impact on the environment and biodiversity.

The development of synthetic insecticides in the mid-20th century revolutionized pest control. Chlorinated hydrocarbons, epitomized by DDT, gained prominence after 1939. Paul Müller received the 1948 Nobel Prize for identifying DDT's insecticidal properties, and it was introduced for use in 1944. These compounds, which disrupt the nervous system, were valued for their stability and long residual action. However, their environmental persistence led to widespread bans on chemicals like DDT, chlordane, and toxaphene.

Following the chlorinated hydrocarbons, organophosphates emerged as a versatile class of insecticides. These chemicals kill by inhibiting the enzyme cholinesterase, an essential component of the nervous system. While they are generally more toxic than their predecessors, they typically do not persist in the environment. Their mechanism of action is notably similar to that of certain chemical warfare nerve agents, such as sarin and VX. Because of their cumulative toxic effects on wildlife, their use has declined in regions like the United States.

Today, neonicotinoids represent the most widely used class of pesticides globally, introduced in the late 1980s. These systemic insecticides, which include imidacloprid, are chemically related to nicotine and act as acetylcholine receptor agonists. They are frequently applied as seed dressings, providing prophylactic protection for annual crops. Despite their efficacy, they have faced significant scrutiny since the late 1990s, with studies linking them to ecological issues such as honey-bee colony collapse disorder and broader declines in insect populations. This has prompted partial bans and stricter testing requirements in jurisdictions like the European Union.

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