F.M. EL - AGAMY AND K.F. HAYNES *
* Entomology Dept., Fac. of Agric , Kentucky Univ., Lexington, U.S.A.
Department of Plant Protection , Faculty of Agric., Tanta Univ. Kafr l - Sheikh, Egypt.

ABSTRACT

The obstinacy behaviour of pea aphid, Acyrthosiphon piswn ( Harris) against synthetic alarm pheromone applied in combinazion with the malathion insecticide or the predator Nabis americoferiss (Carayon) was rested in green house studies . Aphid alarm pheromone, (E) - B- famesene did have a lithe synergistic effect when combined with malathion, but survival was decreased by 14.7 % .Aphids were not more accepted by the predator , N. americoferus in the presence of aphid alarm pheromone . The presence of alarm pheromone stimulated dispersal in the form of walking and significantly fewer aphids remained stationary at 5 and 15 minutes after the introduction of a rubber septum containing alarm pheromone than in the control groups.

Key Words: Insecta, Acyrthosiphon pisum. Alarm pheromone, Nabis americoferiss.