Dutch ecologist Roxina Soler and her colleagues have discovered that subterranean and aboveground herbivorous insects can communicate with each other by using plants as telephones. Subterranean insects issue chemical warning signals via the leaves of the plant. This way, aboveground insects are alerted that the plant is already ‘occupied’........
http://www.nwo.nl/nwohome.nsf/pages/NWOA_7DLG9H_Eng?Opendocument
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