Tiny predatory mites are now being deployed by drones to save California strawberry crops
In short: In California, strawberry fields are under siege by spider mites, tiny arachnids that drain plant sap and ruin harvests. To fight back, farmers are moving beyond pesticides—which these pests often resist—and turning to high-tech aerial warfare. Thousands of predatory mites are now being dropped from drones to hunt them down.
Spider mites, which are arachnids related to ticks and spiders rather than insects, are notoriously difficult to control. Roughly the size of a grain of salt, they cause extensive damage by sucking sap from leaves and stems, leaving behind dry, rusty foliage and fine silk webs. While chemical pesticides are a common tool, these mites frequently develop resistance, rendering traditional sprays ineffective over time. Consequently, many growers have shifted toward biological control, specifically using a predatory mite known as persimilis that actively hunts spider mites and their eggs.
Distributing these microscopic hunters across massive agricultural landscapes presents a significant logistical hurdle. To solve this, some farmers are partnering with companies like Parabug to disperse the predators via drones. Researchers at UC Davis, including entomologist Christian Nansen and engineer Zhaodan Kong, are now working to refine this process into a fully automated system. Their approach utilizes drones equipped with specialized cameras designed to monitor how sunlight reflects off plant leaves, a metric that can reveal subtle signs of crop stress.
The team is developing machine learning software capable of interpreting these reflectance patterns to diagnose specific infestations. If the system identifies a spider mite outbreak, it can trigger a second drone to deploy predatory mites directly onto the affected areas. Nansen describes these predators as tiny paratroopers, guided by an eye in the sky to ensure they land exactly where they are needed most. This integration of advanced imaging and precision delivery aims to transform crop protection, moving from broad, manual applications to targeted, automated biological interventions.
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- Summary by Intellect · source: These Mites Rain Down To Save Your Strawberries | Deep Look
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