Just add water: The garden insect that can turn into a plague - Jeffrey A. Lockwood

TL;DR

Desert locusts are harmless insects that turn into crop-consuming plagues when specific conditions are met, such as an abundance of rain. Their swarms can cover hundreds of square kilometers, easily overwhelming predators and endangering crops and pastures in some of the world's poorest countries.

Transcript

The ravenous swarm stretches as far as the eye can see. It has no commanding general or strategic plan; its only goals are to eat, breed, and move on— a relentless advance that transforms pastures and farms into barren wastelands. These are desert locusts— infamous among their locust cousins for their massive swarms and capacity for destruction... Read More

Key Insights

• 🎙️ Desert locusts undergo a significant transformation from harmless insects to crop-consuming plagues when specific conditions align.
• 💯 Swarms of desert locusts can cover hundreds of square kilometers and overwhelm their predators.
• 👯 The regions where desert locusts inhabit, largely populated by people who rely on agriculture, are at direct risk from locust plagues.
• 🐪 Wet periods and human intervention can help mitigate desert locust plagues.
• 💱 Climate change and intensive agricultural practices contribute to the exacerbation of the locust threat.

Questions & Answers

Q: Why do desert locusts only turn into crop-consuming plagues under specific conditions?

Desert locusts require increased moisture and abundant vegetation for their population to grow, triggering their transformation into destructive swarms.

Q: How do desert locusts communicate with each other during the transformation?

Desert locusts release pheromones in their poop as a means of communication, further enhancing their clustering behavior and transformation into swarms.

Q: Can desert locust swarms cross large bodies of water?

Yes, desert locust swarms can fly across large bodies of water, and in some cases, they have been observed forming rafts to rest during their journey.

Q: How can humans intervene to mitigate the threat of desert locust plagues?

Human intervention involves using satellite imagery to identify at-risk areas, alerting local governments, and implementing measures such as chemical insecticides or fungal diseases lethal to locusts but safe for people and the environment.

Summary & Key Takeaways

• Desert locusts are generally harmless insects that live a solitary lifestyle during dry weather, but when an abundance of rain occurs, they undergo a transformation.

• Increased moisture leads to the clustering of large groups of locusts, stimulating their transformation into gluttonous crowds that consume crops and produce large amounts of pheromone-carrying poop.

• The transformation includes a shift to a toxic diet, warning predators, merging into bands of millions, shedding and expanding their exoskeletons, and eventually becoming full-fledged swarms.