Produced by: Mansi Sharma, Louis Wong, Jeffrey J. Lin

Join us as we uncover the secrets of the MedFly through an examination of how California has historically managed its medfly infestations. As we move through decades of federal lawmaking, state policy decisions, and scientific research, we will expose how a decades-long disagreement between scientists and extreme pesticide spraying has shaped the villainous portrayal of the MedFly.
Longer Description:
The Mediterranean Fly has made a name for itself as one of the most notorious fruit fly species around the world. Although the MedFly has had devastating economic impacts in numerous regions, our podcast centers around MedFly tensions in California specifically. From the first MedFly invasions of California to those as recent as last year, the MedFly continues to pose a threat to California’s status as a golden agricultural state. In response to the threat of the MedFly, California has utilized man-made interventions like aerial pesticide sprays to eradicate the fruit fly, while imposing strict quarantine guidelines. Over time, California’s defenses against the MedFly have evolved from strictly chemical interventions to incorporating new scientific techniques like the sterile insect technique.
However, the tension between the MedFly and California is only one aspect of the story. Our podcast investigates how the “MedFly problem” has changed from a “man vs. insect” scenario into various “man vs. man” scenarios. The government’s response to the MedFly has increased tension between the public and the government, a result of public pushback and growing public distrust in the government and fear surrounding pesticides. The government has shown that their priority is to protect California’s reputation and agricultural econonmy, even if that means rushing to lift quarantine restrictions or enforcing pesticide sprays. While this may benefit agricultural companies, the average person has now been exposed to dangerous chemicals that could give rise to health problems. All of these social tensions were not directly caused by the MedFly, but rather our own actions in one-sided fight against the MedFly. Our podcast examines how these tensions have evolved over time using a holistic analysis through a scientific lens, an economic lens, and a social lens.

Suggested Further Reading

Five sources we recommend for listeners who want to go deeper.

1. Scott, T. (Director). (2025). Why the government drops flies on California. [Film]. Facebook. https://www.facebook.com/tomscott/videos/why-the-government-drops-flies-on-california/3288278304683543/

2. Subramaniam, B. (2001). The aliens have landed! — Accessible analysis of how 'invasive species' language mirrors xenophobic rhetoric around immigration. JSTOR: http://www.jstor.org/stable/40338794

3. Carey, J. R. (1991). Establishment of the Mediterranean fruit fly in California. Science,253(5026). — The landmark paper arguing medflies are California residents, not perpetual invaders. https://doi.org/10.1126/science.1896848

4. Rolls, D. A., et al. (2025). Estimating the realised economic value of a historic Mediterranean fruit fly eradication. Scientific Reports, 15(1). — Rigorous economic analysis showing biosecurity benefits can materialize decades later. https://doi.org/10.1038/s41598-025-28594-2

5. Schwartz, N. A., et al. (2015). 'Where they (live, work and) spray.' Health & Place, 32, 83–92. — Ethnographic study giving voice to farmworker communities most harmed by pesticide exposure. https://doi.org/10.1016/j.healthplace.2014.12.016

Pests and Prejudice is a podcast series created by UCLA undergraduates in the spring of 2026. Each episode is a story of a messy relationship, one in which people seduced pests, and then decided to break up with them... and it usually goes about as well as you would expect...