Life history characteristics of the diamondback moth (DBM), Plutella xylostella, a worldwide pest on cruciferous crops, and its important natural enemy, the parasitoid Diadegma semiclausum have intensely been studied. In addition, the searching behaviour of the parasitoid and the role of foraging experiences have been studied. Recently, fed and unfed individuals of the parasitoid D. semiclausum, that forage for hosts in field cages have been shown to differ considerably in their patch leaving tendencies from plant patches with different host densities. Moreover, flight patterns in the field differ between fed and unfed parasitoids. Separately, all these data do not necessarily amount to knowledge on what happens at the field scale. In this paper, results from behavioural studies are integrated with studies on longevity of parasitoids and host development to assess the fieldwide impact of nutritional state on biological control efficacy. To achieve this, an individual based, spatially explicit, simulation model is developed to study how differences in behaviour and longevity between fed and unfed parasitoids affect the percentage parasitism and thereby the biological pest control of DBM in the field. The results are discussed in the light of improving biological control of DBM in broccoli fields if nectar sources are supplied in borders of the crop fields.
|Title of host publication||18e Nederlandse Entomologendag 15-12-2006, Ede/18th meeting Netherlands Entomological Society, 15-12-2006, Ede, The Netherlands|
|Publication status||Published - 2007|