Population of tetranychidae mites on apple trees and methods of restraining the number of resistant races in crimea

Analysis of apple tree phytosanitary state showed that the species composition phytophage mites is labile and subject to a constant shift share ratio. In 2012-2013, orchards Crimea were dominated by Amphytetranychus viennensis Zacher. Its in acarocomplex was 80%. Since 2014, ratio has changed towards prevalence Panonychus ulmi Koch. - 50%. With this, A. decreased 25.0%. some years there mass reproduction Tetranychus turkestani Ug et Nik urticae The number during growing season depends on factors: settlement new areas, interspecies competition, reduction feed base, occurrence fungal diseases epidemics, increase natural enemies. dependence population density numerical value hydrothermal moisture index (HMI) established: higher average daily air temperature absence precipitation, leaf apparatus. Appearance resistant P. races five acaricides belonging different chemical classes established with following active substances: spirodiclofen, fenpyroximate, pyridaben, fenazaquin, tebufenpyrad. viennensisshowed appearance acaricide-resistant substances pyridaben connection decrease acaricide effectiveness against spider industrial plantations Crimea, an anti-resistant protection strategy been developed using predatory Phytoseiidae Phytoseiulus persimilis Ath. H, Neoseiulus californicus McGregor, Amblyseius andersoni Chant.