Evaluation of the effect of insecticidal chemical compounds on a resistant population of Amphitetranychus viennensis (Zacher, 1920) (Trombidiformes: Tetranychidae)

   Tetranychidae spider mites are broad polyphages that cause significant damage to agricultural production. Fruit crops are inhabited by economically significant species of spider mites – Panonychus ulmi (Koch, 1836), Tetranychus turkestani (Ugarov & Nikolskii, 1937), Tetranychus urticae (Koch, 1836) and Amphitetranychus viennensis (Zacher, 1920). From 2023 to the present, A. viennensis has occupied a dominant position in the acaraceae complex of phytophagous mites in fruit orchards and is found everywhere in various agro-climatic regions of the Republic of Crimea. Outbreaks of spider mites in garden plantings are noted annually, during the growing season, the threshold of harmfulness is exceeded from 3 to 6 times, and therefore intensive pesticide treatments are carried out. Repeated use of insecticidal drugs has a detrimental effect on the number of entomophages, which partially regulate the number of phytophages, and leads to the appearance of pesticide-resistant pest species. The acaricidal effect of drugs from various chemical classes against the abamectin-resistant A. viennensis race selected in fruit plantations was evaluated in laboratory conditions. As a result of the research, it was found that the combination of drugs fenpiroximate (50 g/l) + hexithiazox (250 g/l) in n.p. 1.0 l/ha + 0.18 l/ha, fenpiroximate (50 g/l) + clofentesine (500 g/l) in n.p. 0.6 l/ha + 0.3 l/ha, fenpiroximate (50 g/l) + clofentesine (500 g/l) in n.p. 1.0 l/ha + 0.5 l/ha and fenpiroximate (50 g/l) + tebufenpyrade (200 g/kg) in n.p. 0.6 l/ha + 0.3 l/ha shows the highest efficiency, from 93.4 to 99.6 %. The decrease in the number of A. viennensis by more than two times was established from 3 days after the treatment. Drugs used in pure form with D. V. tebufenpyrad, 200 g/kg, hexithiazox 250 g/l and fenpiroximate, 50 g/l, used in pure form had no effect on population decline.

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