Predators sniff out prey using leaked chemical scent trails
Aigbedion-Atalor PO, Faaulu A, Goodman V, Malenge B, Moennich N
Plant Signaling
The ladybugs, parasitic wasps, and other natural pest-killers patrolling your garden are following scent trails left by aphids and caterpillars, and understanding those trails could help you attract more of these free pest-control allies.
When a caterpillar chews on a leaf or an aphid moves across a plant, it unintentionally leaks chemical signals into the air. Predators and parasitic insects have evolved to pick up on these leaked signals, called kairomones, to find their next meal or a place to lay eggs. Researchers reviewing this field say we could bottle these same scent cues to invite more pest-eating insects into farms and gardens, offering a more natural alternative to spraying pesticides.
Key Findings
Kairomones come from multiple sources including host/prey bodies, cuticular compounds, pheromones, and plant volatiles induced by herbivory or egg-laying
Most existing research develops kairomones for attracting a single natural enemy species rather than blends that draw in multiple beneficial predators or parasitoids at once
Combining kairomone lures with other pest-management strategies like reward plants, push-pull companion planting, and beneficial microbes shows promise but remains underexplored in field trials
chevron_right Technical Summary
Insects and other arthropods eavesdrop on chemical signals called kairomones, scent cues leaking from prey or host plants, to track down their next meal or egg-laying site. Scientists reviewing decades of research say these scent cues could be harnessed to lure pest-eating predators into farms and gardens, cutting the need for chemical pesticides.
Abstract Preview
Original paper
Eavesdropping Kairomone Markers of Interspecific Communication in Predatory and Parasitic Arthropods: A Review.
Interspecific chemical communication in insects is quintessential in mediating ecological interactions across trophic levels. Kairomones are semiochemicals emitted by one species (the emitter) and ...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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