Repellant allelochemicals could be the 21 st century environmentally friendly plant protectants applied in agricultural pest control. α-pinene, a monoterpene,was evaluated for repellent activity against Phyllotreta striolata in a four-armed olfactometer, flight-chamber and field tests. In the laboratory, repellency reached 95^45% with a corresponding IIPC of 0^05 in olfactometry; in the flight-chamber trial,repellency and IIPC were 91^60% and 0^09, respectiviely. In the field, however, repellency and IIPC ...