Two spotted spider mite (Tetranychus urticae, Koch) resistance to METI acaricides analysed in selected Polish apple orchards

Two spotted spider mite (Tetranychus urticae, Koch) is one of important apple orchards pest. Some of the commonly used acaricides against motil stages of this pest are those from the METI group (mitochondrial electron transport inhibitors). The aim of the study was to evaluate the prevalence of the phenomenon of resistance in apple orchards in Poland. The mites collected in orchards located in different regions of country were tested in laboratory with registered compounds belonging to the METI acaricides (Magus 200 SC, Ortus 05 SC, Sanmite 20 WP). Some of the tested populations were characterized by a high resistance, comparable with the resistance of individuals from laboratory breeding resistant strain Akita.