Response to temperature and photoperiod during development and reproduction in Tetranychus urticae Koch (Acari: Tetranychidae)
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عنوان دوره: سومین کنگره بین المللی حشره شناسی ایران
نویسندگان
Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran,
چکیده
To study the impact of temperature and photoperiod on Tetranychus urticae Koch, the life table parameters of the mite was investigated at 20 ˚C, 50% RH and photoperiods of 16:8 (control), 14:10, 12:12, 10:14 and 8:16 h (L:D). Developmental time of almost all immature stages was longer (17.360 ± 0.368 days) at 12:12 h L:D compared with that in control (12.419 ± 0.211 days). Moreover, at 12:12 h L:D and 20 ˚C, female adults had lower fecundity (51.840 ± 15.25 eggs/female) and oviposition period (12.619 ± 3.005 days) compared with those of control (122.333 ± 15.381 eggs/female and 15.111 ± 1.949 days, respectively). The longevity of female (14.440 ± 3.051 days) was shorter compared with that of control (18.259 ± 2.125 days) at 12:12 h L:D. Similarly, the lowest values of the intrinsic rate of increase (r =0.110 ± 0.009 d-1) and net reproductive rate (R0= 25.920 ± 8.387 offspring) were obtained at 12:12 h L:D and the highest ones were observed in control (r =0.200 ± 0.008 d-1 and R0 =66.060 ± 11.902 offspring, respectively). The other treatments had no significant difference with control. It could be concluded that T. urticae has reproductive dependence to changing photoperiod (12L:12D h) and temperature (20 ˚C). Since the mite is one of the most serious pests in greenhouses, it may cause different damages with changes in the greenhouse temperature and photoperiod conditions.
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