Ahmad Mousavi - Department of Entomology and Plant Pathology, College of Aburaihan, University of Tehran, Iran.
Katayoon Kheradmand - Department of Entomology and Plant Pathology, College of Aburaihan, University of Tehran, Iran.
Hadi Mosallanejad - Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.
Yaghoub Fathipour - Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Mohammad Reza Havasi - Department of Entomology and Plant Pathology, College of Aburaihan, University of Tehran, Iran.

The two-spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae) is one of the most important pests of many crops worldwide. Combined tactics for pest management have a significant special effect on reducing pesticide use and maintaining the activity of natural enemies, which is the main objective of IPM programs. The effect of low-lethal concentrations of Eforia (۲۴.۷ SC, Syngenta Co.) at LC۵, LC۱۵, and LC۲۵ were investigated on biological parameters of Amblyseius swirskii Athias-Henriot (Acari: Phytoseiidae) under laboratory condition at ۲۵ ± ۱ °C, ۷۰ ± ۵% RH and ۱۶:۸ (L: D) h. The data were analyzed based on a two-sex life table procedure. The results showed that Eforia caused a significant reduction in fecundity (Control: ۳۷.۱۷; LC۲۵: ۲۳.۰۴ eggs/female) and total life span (Control: ۴۲.۶۷ days; LC۲۵: ۲۴.۶۵ days). The net reproductive rate (R۰) was ۲۲.۳۱, ۲۰.۱۲, ۱۵.۱۴, and ۱۴.۹۸ eggs/individual, respectively, at control, LC۵, LC۱۵, and LC۲۵. The maximum and minimum values for the intrinsic rate of increase (r) were recorded to be ۰.۱۷ (Control, LC۵, and LC۲۵) and ۰.۱۵ (LC۱۵) day-۱ for the treated mites. Based on the results, the application of low lethal concentrations of Eforia harms some biological parameters of this predatory mite, and the results of this study showed that Eforia may not be applied for the control of T. urticae pest together with A. swirskii.

Amblysseius swirskii, Life table, Sublethal concentration, Eforia, Two-spotted spider mite