The present research aimed to study the biology and mass production of the predatory bug Deraeocoris lutescens Schilling (Hemiptera: Miridae) at 25±1°C temperature, relative humidity of 60±10% and a photoperiod of 16:8 h (L:D). Predatory bug reared on broad bean leaves in the round plastic Petri dishes or on bean plants. For the predator, a small measure of Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae) eggs was offered as food every two days. The fecundity experiments on different plant species were investigated among four groups of plants, five crop plant species, three greenhouse plant species, six orchard plant species and five ornamental plant species. Among different plant species, most oviposition was on broad bean leaves with a total of 41.7±3.7, sweet pepper with 31.1±3.4, grape leave with 13.9±2.8 and begonia with 39.3±3.0 eggs in each group. In order to determine preference of D. lutescens for oviposition, broad bean leaves which infested with different nutritional sources, Aphis fabae, eggs of S. cerealella, 10% honey emulsion and 10% honey emulsion + yeast extract were used. Among these leaves as substrates of oviposition, the adult females showed higher preference for leaves infested with eggs of S. cerealella than with other nutritional sources.
