Yale Study Finds Garlic Compound Blocks Insect Mating

A Yale University research team tested 43 fruits and vegetables to find natural compounds that affect insect reproduction. They used fruit flies as a model organism because the species often mates on food sources. Garlic puree completely blocked mating and egg-laying in the flies.

Separate tests showed the effect required direct contact with the insects' taste organs rather than smell alone. Chemical analysis identified diallyl disulfide as the active compound. The substance activates the TrpA1 receptor in bitter taste-sensitive neurons, altering gene expression linked to satiety.

The same results appeared when the experiments were repeated with two mosquito species that transmit yellow fever, dengue, and Zika virus, as well as with tsetse flies. In each case, garlic exposure reduced reproductive activity. John Carlson, a Yale professor and study coauthor, said the plant is inexpensive and grown worldwide.

He noted that the idea of using garlic against blood-feeding insects dates to Bram Stoker's 1897 novel Dracula. The findings were published in the journal Cell. The authors suggest the compound could be developed as a low-cost method to limit insect populations that affect human health and agriculture.