John Carlson's lab at Yale reported that a natural compound in garlic blocks mating and lowers egg-laying in mosquitoes and several kinds of flies. The team began its work with fruit flies, including harmless species, and then tested the compound in other species. The researchers were surprised to find a plant compound that shuts down mating behaviour.
The effect does not come from garlic's strong smell. Instead, taste is key: a specific receptor inside the insects' small taste organs responds to the garlic compound and prevents normal mating behaviour. The results appear in the journal Cell.
The authors describe their screening method as a "phytoscreen," an approach that searches plants for chemicals that change insect behaviour. The word phyto comes from the Greek for "plant." The team says phytoscreen could point to pest control strategies that are environmentally friendly, widely available and inexpensive.
- A postdoctoral researcher helped begin the project.
- Early experiments used a "fruit fly buffet" to test compounds.
- The report also mentions a cultural reference to Bram Stoker about garlic.
The item first appeared on Futurity, and the researchers note it is not yet clear how quickly these findings could be turned into practical tools.
Difficult words
- compound — a substance made of two or more chemicals
- receptor — a protein that detects specific molecules in cells
- phytoscreen — a method that tests plants for active chemicals
- mate — to join with another organism to reproducemating
- screening — a process of testing many samples or substances
- environmentally friendly — causing little harm to nature or ecosystems
- inexpensive — not costing much; low in price
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- What advantages and challenges might phytoscreen offer for developing pest control methods?
- Why is it significant that a taste receptor, not smell, prevents normal mating behaviour?
- What steps would be necessary to turn this laboratory finding into a practical tool for farmers or public health?
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