Scientists are using an electronic nose tailored to eavesdrop on plants that have been damaged or are under attack. The nose successfully discriminated among the various distress signals different plants emit, depending on the pests plaguing them — discerning, for example, a tobacco hornworm attack from assault by powdery mildew. (more)
Not so strange.
Our noses have always been talking.
"I smell a rat." (lying)
"The smell of fear." (fear)
"The smell of death." (sickness)
"The scent of a woman." (attraction)
...and dog's noses talk even louder.