Abstract

                                The present study aimed to evaluate the effect of prey density on the biologyand functional response of green lacewing, Mallada boninensis (Okamato)(Neuroptera: Chrysopidae). Newly emerged larvae of M. boninensiswere fed 20, 30, 40, 50, 60, 70, 80, 90 and 100 fresh eggs of Corcyracephalonica (Lepidoptera: Gelechiidae) in plastic vials. It was observedthat the prey density had a significant effect on the positive consumptionrate, development, and fecundity of M. boninensis. In general, maximumconsumption with shortest developmental time, maximum fecundity, andmost extended adult longevity was observed as prey density increased.The predatory potential was high when the prey density was raised. Thedaily predation rate of M. boninensis increased slowly during the first twoinstars and reached its peak in the third larval instar. The results indicatedthat M. boninensis feeding potential and developmental period might varyfrom 6.00 to 11.33 days based on food density and having a difference inper day consumption. The 100 Corcyra eggs/day treatment had the highestegg intake of 87.88 eggs per day, followed by 90 eggs/day (79.33 eggs) and80 egg day-1 (69.75 eggs).

Key words : Corcyra cephalonica; Chrysopidae; Prey density; Lacewing; Mallada boninensis