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Why the government drops flies on California

Why the government drops flies on California

Tom Scott

2.1M views 2 years ago

Warm-up Questions

What do you think it means to “drop flies” on a city?
Why might the government want to stop an insect from spreading in California?
What problems could an invasive pest cause for farms and fruit?

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Why the government drops flies on California

The problem: medflies and the preventive program (00:00 – 00:52)

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1. Why are medflies a serious problem in California?

They pollinate fruit trees too quickly.
They eat only leaves and slow down plant growth.
They lay eggs inside fruit and can devastate crops.

2. What happened during the two-year test of releasing sterile flies?

California experienced zero infestations.
Infestations increased across the state.
The program was stopped because it was unsafe.

3. What is mentioned about the Medfly Preventive Release Program today?

It operates only in winter months.
It covers 1,750 square miles.
It releases only female flies.

Why the government drops flies on California

How sterile flies are produced, prepared, and released (00:52 – 04:18)

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1. When are the flies sterilized, and what method is used?

In the pupal stage, with radiation.
As adults, using pesticides.
As eggs, using heat.

2. Why is ginger root oil used under each tower?

It kills wild medflies in the trays.
It increases the chance that sterile males will have successful matings.
It helps the flies fly longer distances.

3. About how high are the flies typically released above ground level?

Around 2,000 feet.
Around 200 feet.
Around 20,000 feet.

Why the government drops flies on California

Detection, quarantine, and whether it works (04:18 – 06:36)

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1. How do workers distinguish a sterile fly from a wild fly?

By listening to the sound of its wings.
By screening under a UV light for the marker dye.
By measuring the fly’s weight.

2. What can happen in a quarantine area, according to the video?

People cannot legally sell fruit (or even give it away) in the area.
All airplanes must stop flying over the area.
People must grow fruit for the government.

3. After the program started, about how many infestations per year are mentioned in the release area?

About seven or eight a year.
About one a year.
About one a week.

Why the government drops flies on California

Transcript will load here…

1. What is the main purpose of releasing sterile male medflies?

To increase the medfly population so predators will eat them
To stop wild medflies from successfully reproducing
To make fruit ripen faster

2. Why does the program focus on releasing sterile males rather than sterile females?

Because male flies do not fly and are easier to catch
Because sterile males can mate with wild females, causing eggs not to hatch
Because only female flies can be sterilized

3. Which action is an example of a government response when an infestation is detected?

Increasing delimitation trapping and possibly fruit removal
Stopping all farming permanently in the region
Turning off UV lights in the identification unit

Discussion Questions

Discuss the ideas from this video

Why the government drops flies on California

What are the advantages and disadvantages of using sterile insects instead of pesticides?
How would you feel if planes released insects over your city every few days? Why?
Do you think quarantine rules (like not being able to sell fruit) are fair? What could make them easier for people to follow?
What other invasive pests or environmental problems does your region face, and how are they controlled?

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