You may recall in 2023 a paper in Cell from the Hadany and Yovel labs at Tel Aviv University showed that drought-stressed tomato and tobacco plants emit ultrasonic clicks.
Who grows tobacco? Nevermind.
The sound is mechanical, from cavitation in the xylem. Air bubbles form as water columns break under tension from drying out and the collapse radiates a click into the air (20 to 100 kHz). It’s like anything drying out and cracking audibly, which becomes a signal.
A follow-up, released January 5, 2026 by Seltzer and colleagues from the same labs, asked if drying is audible then what might process the signal. Their answer is female moths.
Given a choice of where to lay eggs, moths avoid plants emitting clicks of drying and prefer the silent wet ones (intact water columns). Healthy hosts, healthy larvae. The moth treats acoustic emission of drying plants as an air traffic control signal. Without a plant present, moths preferred the playback side (treating clicks as evidence of plant presence at all). Only with hydrated plants on both sides did a silent plant win.
Of course, popular framing in 2023 was that plants scream. I mean, it’s hard not to want to believe, to see a face, hear a voice. Stare into the tomatoes long enough and you become one with the ketchup.

The authors did not speak about any speech of plants, and their report does not support it. There is no nervous system or nociceptor, let alone a pathway that evolved for signal transmission. The noise of cavitation is a physical consequence of negative pressure in a drying vascular system.
A drying plant cannot stop producing dryness sounds any more than cracking paint can stop looking like it’s cracked.
The moth study is interesting because it raises an ultrasonic adaptation to signals. Information considered hidden to humans can be extracted by anything with the receiver bandwidth to extract it. Moths already operated in ultrasonic because bats hunt them. Turns out their safety auditory hardware wasn’t just for defense, it also has a plant hydration offense as well.
We’re talking about Israel here, so it’s worth noting Tel Aviv University’s Ramot was granted US Patent 12,480,915 in November 2025 covering airborne acoustic plant monitoring across hydration, structural integrity, pathogen load, herbivore damage, and fruit density, including ground and aerial platforms. You can read that as a drone passing over a field listening for cavitation is a viable irrigation tool.
The farmer can automate the surveillance of thirsty tomatoes now just like a moth finds optimal hosts. I suspect the farmer also can broadcast signals of drying to keep moths away from wet ones, directing flight towards capture.
Given these developments have evolved since 2023 I find myself asking today why Israel tracks down innocent children with drones, keying on sophisticated (optical, thermal, and ML-based pattern recognition) signals, and shoots them in the back or head instead of detecting their thirst and offering them a drink of water.
Seems like we often talk about dual use military application of civilian tech in the exact wrong direction.
Come on Tel Aviv University. You know what to do.


