نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Rose flowers are as a shrubs plants which have several pests including rose aphid, Macrosiphum rosae. Aphids control more dependent on the use of chemical insecticides. Due to the frequent use of pesticides, many species of aphids have become resistant to many chemicals. So, the alternative method is needed to control aphids. In this study, in order to reduce pest damage and adverse effects of pesticides, the effects of Azadirachtin indicae on reproductive parameters of rose aphid were studied. Experiments were conducted in the laboratory condition, temperature 25 ± 1ºC, 60±5 % RH and photoperiod 16: 8 (L: D). After bioassay, the amount of LC10, LC25, LC50 and LC90 azadirachtin on rose aphid were calculated 0.5, 0.9, 1.62 and 4.94 ml/l, respectively. The data of fertility life table and reproductive parameters of rose aphid obtained on these concentrations. Maximum longevity of rose aphid was in the control and the minimums were in the 0.9 and 1.62 ml/l of the concentrations. Life expectancy in the first day of aphid, in control and 0.5, 0.9, 1.62 and 4.94 ml/l of azadirachtin concentrations was 9.85, 4.5, 3.22, 2.37 and 0. 95 days, respectively. The gross reproduction rate (GRR) of rose aphid in the control and 0.5, 0.9 and 1.62 ml/l of azadirachtin concentrations were 19.13, 8.73, 4.19 and 3.66 nymphs/female, respectively. The net reproductive rate (R0) with mortality of reproductive female, in the control and 0.5, 0.9 and 1.62 ml/l of azadirachtin concentrations was 12.95, 3.1, 1.3 and 1.02 nymphs, respectively. The intrinsic rate of natural increase (rm) in the control and 0.5, 0.9 and 1.62 ml/l of azadirachtin was 0.30, 0.18, 0.04, and 0.01 day-1, respectively. The results indicated a strong effect of azadirachtin on reproductive parameters of rese aphid.
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