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Synomone-mediated interactions between the parasitoidDiaeretiella rapae andBrevicoryne brassicae under field conditions

Research paper by M. Titayavan, M. A. Altieri

Indexed on: 01 Dec '90Published on: 01 Dec '90Published in: BioControl



Abstract

An interaction apparently mediated by synomones (Nordlundet al., 1981) betweenDiaeretiella rapae (M'Intosh), a primary parasitoid and the cabbage aphid,Brevicoryne brassicae (L.), was investigated under field conditions. Direct application of an allylisothiocyanate emulsion at a rate of 0.25 ml per broccoli plant consistently gave higher aphid parasitization rates and/or number of wasps per plant than those observed on plants treated with 0.25 ml of water or with 0.25 ml of wild mustard extract. These results suggest the existence of a synomonemediated interaction between the species involved, indicating potential avenues to enhance field parasitization rates through manipulation of the chemical environment of cole cropping systems.