title: Kairomones for the egg parasiteTrichogramma evanescens Westwood : II. Effect of contact chemicals produced by two of its hosts,Pieris brassicae L. andPieris rapae L.
abstract: In observation-cage experiments some new contact kairomones for the egg parasiteTrichogramma evanescens Westwood are demonstrated.T. evanescens females search significantly longer on cabbage leaves treated with the wing scales of two hosts,Pieris brassicae L. andP. rapae L. Further, egg washes ofP. brassicae containing an oviposition deterrent pheromone for the butterflies, were found to have a contact-kairomonal effect on the parasite.T. evanescens females search significantly longer on cabbage leaves sprayed with a methanol or water wash ofP. brassicae eggs than on leaves treated with the solvent only.
authors: Department of Population Biology, Zoological Laboratory, University of Leiden, The Netherlands.
authors: L P
authors: LP
authors: Noldus
authors: J C
authors: JC
authors: van Lenthren