| Sublethal effects of kanemite on the life table parameters of two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae) |
| Paper ID : 1142-3IICE (R1) |
| Authors: |
|
Mahsa Moradi1, Katayoon Kheradmand *2, Hadi Mossalanejad3, Yaghoub Fathipour4 1aDepartment of Entomology and Plant Pathology, College of Aboraihan, University of Tehran, Pakdasht, Iran. 2Department of Entomology and Plant Pathology, college of Aburaihan , University of Tehran, Pakdasht, Iran 3bIranian Research Institute of Plant Protection, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran 4Tarbiat Modares University |
| Abstract: |
| The two-spotted spider mite (Tetranychus urticae (Acari: Tetranychidae)) is a pest with global spread and causes economic damage on many plants, including cucumbers. The sublethal effects of acequinocyl (Kanemite®) on life table parameters of two-spotted spider mite in different experimental concentrations including LC5, LC10, LC15 as well as control. The sublethal concentrations were determined using the leaf dip bioassay on the adult stages. The experiments were done under laboratory condition at 25±2 ºC, 60±5% RH, and a photoperiod of 16:8 (L: D) hours on the Cucumber (Cucumis sativus L.). In this study, the LC50 value for females of T. urticae was 466.3 ppm. The three sublethal concentrations were determined based on dose-response bioassay so that these levels were selected as 254 (220- 282), 291 (258-317) and 318 (288-343) ppm, respectively. The results demonstrated that by increasing the experimental dose from LC5 to LC15, a significant decline was recorded in the duration of biological maturation for both sexes of the two-spotted spider mite. Furthermore, in examining the total fecundity, it was found that at control, LC5, LC10 and LC15 treatments, the values were 60.24, 58.70, 43.86, and 37.45 eggs per day, respectively. The maximum and minimum values for the intrinsic rate of increase (r) were recorded to be 0.233 and 0.226 day-1 for the mites treated at control and LC15 concentrations, respectively. The net reproductive rate (R0) was decreased from 42.85 in LC5 to 28.45 offspring/individuals in LC15 concentration. The finite rate of increase (λ), reached maximal value (1.263 day-1) in control, whereas minimum value (1.253day-1) that was at LC15 concentration. The gross reproduction rate (GRR) was varied from 35.38 and 52.96 offspring/individual when treated by LC15 and distilled water a respectively. To conclude, the results demonstrated that the sublethal concentrations of tested acaricide have significant effects on some important demographic parameters of T. urticae so these data can be useful in designing management programs for this pest. |
| Keywords: |
| Life- table parameters, sublethal effects, Tetranychus urticae |
| Status : Paper Accepted (Poster Presentation) |
