In 2006, Arizona tried to eliminate a cotton pest by breeding billions more; planes flooded fields with sterile pink bollworm moths; by 2018, the US declared victory

Sometimes one way to defeat a pest is by using more pests. This is as crazy as trying to put out a fire with another fire. Who in their right mind would breed millions of moths in the laboratory, transport them using aircraft, and release them into cotton fields? This was indeed what the scientists intended. Not to unleash another insect infestation, but instead to release billions of sterile pink bollworm moths and deprive the other pests of the opportunity to reproduce.

It might sound like a nightmare for the agriculture industry; however, in reality, it was one of the most carefully planned pest control operations in the history of the US. Twelve years later, in 2018, the results of the 2006 Arizona experiment came to fruition. As published in a 2020 Proceedings of the National Academy of Sciences (PNAS) research article, the pink bollworm, which is a moth species that had infested the American cotton crops for more than a century, was eradicated in 2018 from the continental United States. This offered a refreshing twist in the typical narrative about ecological interventions.

The bug that outlasted a century


The pink bollworm was not originally native to the country; it was introduced in 1917 in the US. It made its way by burrowing into the cotton bolls and damaging the quality of the fiber from within. For many years, it became one of the most destructive pests affecting the American cotton industry. Entomologists tried their best using various control measures like spraying, quarantine, and crop rotation, but they were all futile. Finally, in the early 2000s, they discovered an effective solution to not only control the pests but completely erase it from their continent.

Fighting moths with more moths

This particular tactic came to be known as the sterile insect technique. In this case, the pink bollworm moths were mass-produced in laboratories, sterilized, and released into the Arizona cotton fields by the billions, beginning in 2006. This method, inspired by an older concept employed long ago by two USDA entomologists, Edward Knipling and Raymond Bushland, was near mischief in its ingenuity.

Sterile moths could still court and mate with their wild brethren, but there would not be any consequences for it. There would be no offspring, no next generation, and thus, no resurgence of the pests. As mentioned in Entomology Today, more than 11 billion sterile moths were released in Arizona fields between 2006 and 2014. At first, the ratio of sterile moths to wild ones was around 2-to-1, but as the years passed, the ratio soared to 2,000-to-1 in 2010, and then eventually to 600,000 sterile moths for every single wild one by 2012.

Pairing old-school biology with genetically engineered cotton

The sterile moths were not used alone. Farmers in Arizona had already started growing Bt cotton, which was a genetically modified type of cotton producing proteins lethal to the larvae of the bollworm. Cotton farmers in Arizona, thanks to a special permit from the United States Environmental Protection Agency, could grow 100 percent of Bt cotton, instead of the usual blend that included the non-engineered "refuge" crops.

It was this combination, the genetically modified crop together with massive sterilized insects, that finally disrupted the life cycle of the pests. The 2020 PNAS report titled “Transgenic cotton and sterile insect releases synergize eradication of pink bollworm a century after it invaded the United States,” stated that either technique by itself probably would not have been sufficient to achieve this goal.

When "no bugs found" became the headline

By 2012, there were hardly any surviving pink bollworms caught in Arizona. The scientists further needed about four successive years to observe and be sure the milestone was achieved, by not spotting even a single insect in those years. This was established in 2015.

In three more years, on October 19, 2018, the US Secretary of Agriculture Sonny Perdue signed the USDA APHIS proclamation and officially declared that the pink bollworm had been eliminated from all the cotton-growing areas in the continental United States, almost a century after they first warned farmers about the threat.

Why this still matters for a generation obsessed with sustainability

In its own quiet way, there is a certain countercultural element to this story in 2026. It did not require any flashy start-up, viral marketing strategy, or app. Instead, what was needed was 16 years of rigorous science work, cross-border collaboration with Mexico, and a rather eccentric idea that required genuine patience from institutions to implement.

This is also an example of genetic engineering producing environmental benefits: fewer pesticides used, less crop damage, and the elimination of a long-established invasive species from US cotton-growing areas.

Eradication worked in this case because the bollworm was almost entirely dependent on cotton to survive. This does not mean that the example can be applied everywhere, but the case deserves to be remembered, especially by a generation that tends to hear more about ecological disasters than solutions to them.