Investigating the effect of pray age, nutritional history, and environmental temperature on nutrition rate of Deraeocoris lutescens predatory bugs on some sucking pest in laboratory conditions

The problems caused by pesticides to human health make necessary to use other control methods of low-risk including pest biological control methods against pests. Deraeocoris lutescens (Schilling) predatory bug has a privileged position in biological control of pests particularly sucking pest. In this research, breeding and feeding rate of predator age in various growth steps and in different temperatures were investigated. Tests were done growth chamber with temperature 25±1°C, 60 ± 5 percent relative humidity, and light conditions (16: 8) (L: D) on bean leaves. In examining the last instars’ nymphs and adult nutrition of nymphs of green peach aphid predator, predators of nymphs 1-2 days were more used than to 3-4 days. In this research, total nutrition average of predator age showed significant increase of green peach aphid with temperature increased from 18 to 30°C. In addition, the maximum and minimum food preference was shown on 3-4 days age of bean aphid and green peach aphid, respectively. Therefore, according to the obtained results, D. lutescens age of a promising predator is in combined pest management plans.