A research finding on the aroma produced by mown grass when cut does not
only signal a distress condition, but also a signal attracting beneficial
insects such as parasitic wasps to come to the plant and lay eggs to the
insect pests. This aroma is caused by the emitted volatile organic compounds
that produce a defensive plant mechanism or make the plant less appetizing.
Dr. Michael Kolomiets, a plant pathologist from Texas A&M AgriLife Research
led a study on the role of an organic volatile compound, green leaf volatile
that is observed in mown grass, in plants.

In his study, he observed the function of green leaf volatile by doing a
laboratory and field trial of exposing a mutant corn not producing the
compound under the attack of insect pests. The results show that parasitic
wasps are not attracted to the mutant corn despite the damage caused by
insect pests. This implies that the compound activates jasmonate hormone, a
hormone releasing defensive signals, and produces a SOS-type signal to
attract parasitic wasps to come to the plant due to the presence of insect
pests. In addition, this compound is necessary in certain plant
physiological process. These findings can be useful in creating new drougtt
tolerant and insect resistant crop varieties.


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