Comparing the Efficacy of Different Insecticides on the Control of White Peach Scale, Pseudaulacaspis pentagona on Peach Trees

The white peach scale, Pseudaulacaspis pentagona, is one of the most important pests of stone fruit trees in the northern provinces of Iran. The efficacy of several synthetic and biorational insecticides was investigated on white peach scale in a peach orchard in Shirang-E-Olya village of Kamalan district in Aliabad-E-Katoul city. The study was conducted in a randomized complete block design with 9 treatments and four replications in the peach orchard. Treatments in this experiment include: Pyriproxyfen (EC10%) at the rate of 1 and 2 ml/L, Chlorpyrifos (EC 40.8%) at the rate of 4 and 8 ml/L, Thiacloprid (OD 24%) at the rate of 0.6 and 1.2 ml/L, Spirotetramate (SC 100) at the rate of 1 and 2 ml/L, Flupyradifurone (SL 20%) at the rate of 1 and 2 ml/L, Palizin (SL) at the rate of 3 and 1.5 ml/L, Tondexir (EC) at the rate of 4 and 8 ml/L, Citral (EC) at the rate of 1 and 2 ml/L and control. Sampling was performed 1 day before spraying, and then the first and second generation of this pest after spraying. Data were analyzed by Glm method and means were compared by Duncan multiple range test using SAS software. Spirotetramate (1 ml/L) had the highest efficacy percentage among the insecticides used on the first generation of this pest. For the second generation also, the highest efficacy was observed by Spirotetramate (1ml/L) and Chlorpyrifos (4 ml/L). Among the bio-insecticides, 1.5 ml/L of Palizin and 8 ml/L of Tondexir were highly effective, too. Although chemical insecticide such as Chlorpyrifos showed good results, the new insecticide Spirotetramate had the same or better efficacy than Chlorpyrifos. Therefore this insecticide can be a suitable substituted for chlorpyrifos. Biorational insecticides also had good effect in eliminating white peach scale and can be used as biocompatible insecticide.