Mites are pests which can cause significant damage to apple orchards, especially during drought years. If the level of mite populations is not properly controlled, the leaves whiter and fall, the attacked trees become weaker, have small fruits and fail to form buds for the next year. Limiting the propagation of phytophagus mites populations by using specific acaricides has been inefficient, due to the mites capacity of rapidly developing breeds resistant to the acaricides that were used

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... ly. This paper contains and interprets data collected during 2008-2009 concerning the testing of the biological efficacy for products with acaricide effect and their impact on useful species (predators and parasites). The experiment was conducted in the experimental polygon of SCDVV Blaj, the fruit-growing farm Aiud, on a 9-12 year old apple plantation cultivated with the varieties: Idared, Starkrimson, Jonathan and Florina. Treatments were performed before and after bloosom with: Demitan 200 SC 0.06% 0.05% Torque, Envidor 0.5%, Omit 57 is 0.1%, 0.2% Sanmite. When comparing products, the differences between them were significant. Efficiency coefficient ranged between 95% and 27.91%. The obtained results revealed the selectivity of Demitan and Envidor products over the useful entomofauna present in the studied ecosystem.