Reza Sadeghi; Mohammad Reza Eshrati; Seyed Mohammad Mahdi Mortazavian; Arsalan Jamshidnia; Asgar Ebadollahi
Abstract
Pink stem borer, Sesamia creticaLed, is one of the most important pests of sugarcane and maize in Iran. Insecticidal properties of essential oils of four cumin ecotypes, namely Fars-Sivand (FS), North Khorasan-Shirvan (KS), Kerman-Kuhbanan (KK), and Kerman-Rafsanjan (KR), has been evaluated against 4th ...
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Pink stem borer, Sesamia creticaLed, is one of the most important pests of sugarcane and maize in Iran. Insecticidal properties of essential oils of four cumin ecotypes, namely Fars-Sivand (FS), North Khorasan-Shirvan (KS), Kerman-Kuhbanan (KK), and Kerman-Rafsanjan (KR), has been evaluated against 4th instar-larvae of S. cretica in a completely randomized design with four replications. Larval mortality at 27±2 °C, relative humidity of 65±5%, and 16:8 hours light: darkness period is recorded after 72 hours. Results show that all cumin ecotypes have been toxic to the pest, with the lowest LC50 value, obtained from the essential oil of KR ecotype (2725 ppm) followed by KK, FS, and KS ecotypes (2777, 3099, and 8390 ppm, respectively). The chemical analysis of essential oils tested by GC-MS shows that m-cymene in the KR ecotype has been higher than other cumin ecotypes. Therefore, the high toxicity of KS ecotype compared to other cumin ecotypes can be related to the presence of such compounds. According to the present study’s results, the essential oils of cumin ecotypes are potentially a great substitute for chemical insecticides in the integrated management of S. cretica.
Shirin Taghizoghi; Elias Soltani; Iraj Allahdadi; Reza Sadeghi
Abstract
This research was conducted to investigate the effects of different seed coating treatments on the seed germination of canola under drought and salinity stresses. In order to, two factorial experiments were conducted based on completely randomized design with four replications in laboratory. In both ...
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This research was conducted to investigate the effects of different seed coating treatments on the seed germination of canola under drought and salinity stresses. In order to, two factorial experiments were conducted based on completely randomized design with four replications in laboratory. In both experiments, one of the factors were 10 different seed coating treatments. The second factor was different in two experiments: in the first experiment, the levels of drought stress of 0, -0.8, -1, and -1.2 MPa were considered, and in the second experiment, the levels of salinity stress of 0, 7, 14 and 21 ds/m NaCl were investigated. Results indicated that the lowest hydrotime constant (θH) were observed in T9 (22.627 MPa h), T3 (22.538 MPa h), and T6 (22.263 MPa h). The lowest base water potential (Ψb (50)) were belonged to T4 (-1.332 MPa) and T1 (-1.324 MPa). The maximum of germination percentage under salinity stress (Gmax) was observed in T2 (86.75%). The highest threshold to salinity tolerance (Xo) was belonged to T3 (16.38 ds/m). The highest germination rate was belonged to T3 in all levels of salinity. Totally, seed coating treatments of T3, T6 and T9 were the best treatments under drought stress and T3 was the best treatment under salinity stress.