The sublethal concentration of some pesticides, abamectin, pirimicarb and spirodiclofen on the predaceous plant bug, Deraeocoris lutescens Schilling biology and predation were investigated in the laboratory. The effect of pirimicarb and spirodiclofen were studied at a single rate of application, corresponding to their maximum label-recommended rate. In abamectin treatment, the concentration with third maximum label-recommended rate was used. The experiments were conducted in a climatically controlled chamber at 25±1°C temperature, relative humidity of 60±10% and a photoperiod of 16:8h (L:D) on broad bean leaves in the round plastic Petri dishes. The hatching time of the predator was the longest into the leaves treated with pirimicarb. Moreover, the highest percentage of egg and nymphal mortalities were caused with pirimicarb. The mean developmental time of nymphal instars of the predator were not affected by any of the tested insecticides. There were no significant differences in the tested biological parameters (except the hatching time) and reproduction of the predatory bug in spirodiclofen and control treatments. Abamectin and pirimicarb had significant deleterious effects on the mean total of the predator laid eggs. The mortalities of green peach aphid Myzus persicae (Sulzer) were not significantly different among the treatments with predatory bug (N) and the predatory bug + spirodiclofen (N+S) or the predatory bug + abamectin (N+A). Likewise, there were no significant differences in the aphid’s mortalities between treatments with pirimicarb (P) and the predatory bug + pirimicarb (N+P).
کلید واژگان :Abamectin, biological parameters, Deraeocoris lutescens, pirimicarb, predation, spirodiclofen.
ارزش ریالی : 600000 ریال
با پرداخت الکترونیک