Scientists with the Agricultural Research Service (ARS) have shown that seed meal from plants in the mustard family can kill mosquito larvae, which start their lives in stagnant water before emerging into winged adults that take to the air in search of a blood meal.
, open the door to a biobased approach to controlling the biting insect pests. Adult female mosquitoes feed on the blood of people and other animal hosts to produce eggs. But more than just an itchy nuisance, the pest's bite can also transmit debilitating diseases.
Some consumers may be hesitant to apply synthetic insecticide products, so alternative compounds that naturally repel or kill mosquitoes are also being examined. This research push also addresses another concern: preventing the onset of mosquito resistance to synthetic insecticide ingredients, noted Lina Flor-Weiler, an entomologist with the ARS center's Crop Bio-protection Research Unit.
As larvae, the pests are largely confined to a concentrated area after hatching from eggs deposited there by adult female mosquitoes—a scenario that makes for an ideal pre-emptive strike against the pests before they can mature, mate and bite people, birds and other animals to start the whole miserable cycle over again.
In studies begun in 2022, the researchers examined the larval-killing potential of isothiocyanates, a group of plant defense chemicals that are released when mustard seed meals are soaked in water.
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