Abamectin, chlorpyrifos ethyl and bifenthrin resistance in Panonychus ulmi Koch. (Acari:Tetranychidae) populations collected from apple orchards in Isparta
The spider mites are the second pest group which is tried to be managed in apple orchards following codling moth. The chemical control is generally preferred against spider mites. However, chemical control may lead to resistance in pests in the long time. The resistance development may lead to increase the pesticide usage. Because the dose and spray frequency of pesticides for the management of resistant pest population has been increased mostly. This study was conducted to determine the resistance against abamectin, chlorpyrifos ethyl and bifenthrin in Panonychus ulmi Koch (Acari: Tetranychidae) populations from apple orchards in Isparta. The LC50 values were determined in mentioned populations. The resistance ratios were determined dividing the LC50 values of susceptible population to the LC50 values of orchard populations. According to LC50 value, the resistance ratios against abamectin, chlorpyrifos ethyl and bifenthrin of P. ulmi orchards populations are 0.75-2.25, 0.57-1.76 and 1.19- 3.78 fold, respectively.
P. ulmi, apple, bifenthrin, abamectin, chlorpyrifos ethyl
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