Lethal and Sublethal effects of Spirodiclofen on life table parameters of Tetranychus urtica (Acari: Tetranychidae)
Abstract
Tetranychus urticae Koch is one of the most important pests in agriculture, mainly based on the use of pesticides. The effect of spirotetramat on the parameters of the life table was investigated in laboratory conditions at 25 ± 2 ° C and relative humidity of 65 ± 5% and light period 16: 8 (light: dark). The data were analyzed based on the age-specific two sex life table theory. In the bioassay, the LC50, LC30 pesticide spirotetramat was determined to be 0.05 and 0.14 mg. l, respectively, and was used in the Life Table Test. Pre-oviposition and post-oviposition period of the spirotetramat treatment Tetranychus urticae. (2, 23 and 13.46 days) were significantly longer than the of control treatment periods obtained (1 and 11.56 days respectively). The fertility of the entire life span of the spinach spray grass was 33.1 and 51.22 in the control group. The population growth rate (r), population growth rate (ʎ), population growth rate (R0), average generation duration (T), and gross spill growth rate (GRR) treated with spirotetramat were -0.001, on day, 0.998 on a day, 0.96 (person), 13/75 (day) and 2/92 (person) were estimated. The results of this study showed that lethal concentration of 50% of spirotetramat pesticides significantly, reduced the fertility of dicotyledon scrotum under laboratory conditions and caused population growth of this pest to be almost extinct and could be used to control this pest.
Kay words: Spirotetramat, Sublethal effects, Tetranychus urticae , Life table parameters