Plant and prey food resources and their effects on the reproduction and longevity of the predatory bug Orius majusculus (Reuter) (Hemiptera: Anthocoridae)

Spontaneous colonization of crops by natural enemies contributes to the biological control of pests. However, in order to develop successful Conservation Biological Control programs it is also necessary to provide the required resources (shelter, food, oviposition sites, etc.). In the case of omnivorous predators, that alternatively feed on prey and/or plant materials, the availability of plant resources plays a very significant role in their conservation. Orius majusculus (Reuter) (Hemiptera: Anthocoridae) is an important predator of thrips and other pests in the Mediterranean area. The objective of this study was to evaluate in the lab the potential of Lobularia maritima for the conservation of O. majusculus in the field. The fertility, fecundity and longevity of this predatory bug were tested under lab conditions and with different plant materials (L. maritima and green bean pods) and prey (Ephestia kuehniella eggs). The fertility and fecundity of Orius females was significantly higher on the diets of both plant materials with prey. The longevity differed significantly among diets, being longer for L. maritima plus E. kuehniella eggs. Our results showed that L. maritima could be a useful plant for the conservation of O. majusculus in the field.