RESPONSES OF DASINEURA-BRASSICAE AND ITS PARASITOIDS PLATYGASTER-SUBULIFORMIS AND OMPHALE-CLYPEALIS TO FIELD TRAPS BAITED WITH ORGANIC ISOTHIOCYANATES

responses of Dasineura brassicae and its parasitoids Platygaster subul iformis and Omphale clypealis to allyl and 5-phenylethyl isothiocyanat es have been investigated using a new design of trap in winter oilseed rape. Traps baited with allyl isothiocyanate caught more male and fem ale D. brassicae and more female O. clypealis than traps baited with 2 -phenylethyl isothiocyanate or unbaited traps, whereas traps baited wi th 2-phenylethyl isothiocyanate caught more male and female Platygaste r subuliformis than traps baited with allyl isothiocyanate or unbaited traps. The implications of these results for host-plant and ovipositi on-site location by D. brassicae and for host habitat and host locatio n by the parasitoids are discussed, as is the potential for using thes e responses in integrated pest management strategies.