Now scientists have created a quick way to understand what plants are saying:　a chemical sensor(传感器) called an electronic nose. The“e-nose” can tell compounds that crop plants make when they’re attacked. Scientists say the e-nose could help quickly detect whether plants are being eaten by insects. But today the only way to detect such insects is to visually inspect individual plants. This is a challenging task for managers of greenhouses, enclosed gardens that can house thousands of plants.

　　The research team worked with an e-nose that recognizes volatile compounds. Inside the device, 13 sensors chemically react with volatile compounds. Based on these interactions, the e-nose gives off electronic signals that the scientists analyze using computer software.

　　To test the nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all common greenhouse crops. Then the scientists collected samples of air around damaged leaves from each type of crop. These plants had been damaged by insects, or by scientists who made holes in the leaves with a hole punch(打孔器).

　　The e-nose, it turns out, could identify healthy cucumber, peper and tomato plants based on the volatile compounds they produce. It could also identify tomato leaves that had been damaged. But even more impressive, the device could tell which type of damage—by insects or with a hole punch—had been done to the tomato leaves.

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