The Insect Decline Crisis: How Pesticides Are Driving Ecosystems Toward Collapse

Insects are in freefall — and pesticides are a major driving force. New research shows pesticides, along with habitat loss and climate change, are pushing insect populations to the brink, threatening food systems, biodiversity, and ecological stability worldwide. Scientists warn that up to 40% of insect species could face extinction in the coming decades — a trend so severe it has earned the label “insect apocalypse.”

In this blog, we explore the science behind pesticide-driven insect losses and why chemicals like neonicotinoids, organophosphates, and glyphosate are among the worst offenders — ending with steps toward a healthier future.

Why Pesticide Use Matters in the Insect Crisis

Pesticides are designed to kill — but when they are widely used in agriculture, they don’t just target pests. Many of these chemicals also harm beneficial insects like bees, butterflies, beetles, and other pollinators critical for healthy ecosystems and food production.

These impacts ripple outward:

• Reduced pollination of crops and wild plants
• Collapses in food webs (birds, bats, and other wildlife suffer too)
• Contamination of soil and waterways
• Negative human health effects from residues in food and water

Addressing pesticide use is essential to halt further insect declines — and to protect the services insects provide to people and the planet.

Neonicotinoids

What They Are and How They’re Used

Neonicotinoids (or “neonics”) are a class of systemic insecticides applied to more than 140 crops — from almonds and apples to soy and rice — on an estimated 150 million acres across the U.S. The majority of use comes from seed coatings that provide little real benefit to farmers but introduce toxic chemicals throughout plant tissues.

Deadly Effects on Pollinators and Insects

Neonics are among the most acutely toxic pesticides to bees and other beneficial insects. Even low-level exposure can:

• Impair bees’ navigation, foraging, and memory
• Decrease queen production and suppress immune systems
• Disrupt insect behavior and reproduction

Because they persist in the environment and move easily through water systems, neonics also harm aquatic insects and many endangered species.

Broader Environmental Impacts

Neonics don’t just affect bees. They harm:

• Butterflies and moths
• Ladybugs, earthworms, and predators of crop pests
• Birds and bats that rely on insects for food

Scientists have found that U.S. agriculture is now dozens of times more toxic to pollinators and insects than it was before neonic use began.

Human Health Concerns

Neonics are also linked to potential developmental, neurological, and endocrine problems in humans — including effects from exposure during pregnancy and early life — and residues cannot simply be washed off produce because they are systemic in plants.

Policy Status

Some countries (like the European Union) have banned outdoor neonic use, and several U.S. states and localities have passed restrictions. However, these chemicals are still widely used across the United States.

Organophosphates

Organophosphates are another class of pesticides used heavily on fruits, vegetables, and grains.

Environmental & Insect Harm

These chemicals are acutely toxic to pollinators, birds, and aquatic life and have been linked to declines in multiple species.

Human Health Risks

Developed originally as nerve agents, organophosphates are linked to:

• Brain development issues
• Attention disorders
• Parkinson’s, Alzheimer’s, and cancer risks

Exposure levels in food and water — especially for young children — have raised serious alarms among scientists.

Glyphosate

Glyphosate is the active ingredient in Roundup, the world’s most widely used herbicide. Most genetically engineered crops are designed to tolerate glyphosate, leading to heavy and repeated use across vast farmland.

How It Harms Insects

Glyphosate’s ecological impacts include:

• Decimating milkweed, the sole host plant for monarch butterfly caterpillars
• Disrupting honeybee gut microbiomes — linked with declines in bee health and populations
• Causing a rise in “superweeds,” which leads to higher use of additional toxic herbicides that further damage ecosystems 

Human and Environmental Health Concerns

The World Health Organization lists glyphosate as a probable carcinogen. Exposure has been associated with various health issues, including cancer, kidney disease, endocrine disruption, and gut microbiome damage. Residues are also found in many processed foods.

Other Harmful Pesticides Still in Use

Beyond neonics, organophosphates, and glyphosate, other chemicals pose serious threats to insects and pollinators. Simply replacing one hazardous pesticide with another — a practice called regrettable substitution — does little to reduce harm without an overall shift to safer, ecological farming.

Solutions for Insect Recovery

To protect insects and the ecosystems they support, scientists and advocates emphasize:

• Reducing pesticide use overall
• Transitioning to organic and regenerative farming
• Supporting policies that protect pollinators and limit hazardous chemicals
• Encouraging biodiversity-friendly landscapes in agricultural and urban settings

Insects Need Protection — and So Do We

The evidence is clear: pesticides like neonicotinoids and glyphosate are not just killing pests — they’re dismantling the delicate web of life that sustains ecosystems and our food systems. Understanding these impacts is the first step toward meaningful change.

We have the science, we have the solutions — now it’s time to act.