Determination of spiromesifen+abamectin, spirodiclofen, milbemectin resistance levels of pest Tetranychus urticae koch (Acarina: Tetranychidae) populations in isparta apple orchards

In this study, resistance rates of 10 different Tetranychus urticae Koch (Acarina: Tetranychidae) populations collected from areas in Isparta provinve where intensive apple is produced and it's districts against spiromesifen+abamectin, spirodiclofen and milbemectin were determined. In order to determine whether these populations are resistant to spiromesifen+abamectin, spirodiclofen and milbemectin, first of all, the LC50 and LC90 values of the sensitive (GSS) population of T. urticae were determined by spray tower-leaf disc method. The LC90 value determined in the susceptible population was accepted as the differential dose and applied to the collected T. urticae populations to determine whether there was resistance. Populations with less than 80% mortality at the differential dose were considered resistant and LC50 values were determined. Resistance rates were found by dividing the LC50 values of these orchard populations to the LC50 value of the susceptible population. The resistance rates of these horticultural populations against spiromesifen+abamectin were 1.888-315.308 times; 6.485 13.001 times to spirodiclofen; It changed between 2.976 and 5.891 times to mibemectin.