Young rice plants' scent signals attract more pests than older rice
Balakrishnan D, Shafi I, Vasquez A, Ayala J, Gautam M
Plant Signaling
If you grow rice, corn, or any grass-family crop, knowing that pests zero in on the leafy young-growth stage rather than hitting plants evenly throughout the season means you can scout and treat at the window that actually matters instead of spraying on a fixed calendar.
Plants release scent chemicals (volatiles) that signal to insects whether they're a good target. This study found that rice plants in their young, leafy growth stage give off more of these scents during the day than plants that have moved into flowering, and fall armyworm caterpillars actually prefer the smell of that younger, undamaged growth. The same younger plants also drew in more insects of all kinds in field tests, showing that a plant's life stage, not just whether it's been bitten, shapes who shows up to visit it.
Key Findings
Rice in the vegetative (young, leafy) growth stage emitted significantly more volatile compounds during the day than plants in the reproductive (flowering) stage.
Fall armyworm larvae in Y-tube choice tests preferred volatiles from vegetative-stage and undamaged plants over reproductive-stage or herbivore-damaged plants.
In field trials, the vegetative stage attracted more arthropods overall (with Diptera/flies the most common order), while fall armyworm feeding damage itself did not significantly increase arthropod attraction.
chevron_right Technical Summary
Rice plants release different warning scents depending on their growth stage, and fall armyworm caterpillars pay close attention. Young, leafy rice gets munched on more and attracts more insect visitors overall than older, flowering rice, a finding that could help farmers time pest control more precisely.
Abstract Preview
Original paper
Phenology drives rice-fall armyworm interactions and arthropod community dynamics through foliar volatile signaling.
Volatile organic compounds (VOCs) are one of the key mediators of plant-insect interactions. Although several studies have examined the factors affecting volatile-mediated tritrophic interactions, ...
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