Effects of Different Concentrations of Imazamox Treatments on Parasitism of Orobanche cumana Wallr.
Orobanche cumana Wallr.is a parasitic weed that frequently causes sunflower yield and quality to decline,which has a negative impact on the development of the sunflower industry.To explore the effective means to control the Orobanche cumana,this study used the herbicide-resistant sunflower variety Xinshi 1 as the material and treated it with the herbicide imazamox from the root to study the effects of different concentrations of imazamox on the parasitism of Orobanche cumana.The goal of this research was to discover effective control methods for sunflower parasitism.The results showed that compared with the control,after treating with 1∶300,1∶600 and 1∶1200 diluted imazamox,the germination rates of Orobanche cumana seeds significantly decreased by 26.1％,23.3％and 8.1％,respectively.In the culture-dish system,compared with the control,the number of parasitic nodules produced on sunflower roots decreased by 83.4％and 37.9％,the fresh weight of nodules decreased by 86.3％and 56.5％,and the dry weight of nodules decreased by 87.9％and 53.1％significantly after treating with 1∶300 and 1∶600 diluted imazamox respectively;Under pot-culture condition,compared with the control,the total number of Orobanche cumana parasitized on the roots of sunflower plants decreased by 100.0％,90.3％and 70.8％,the fresh weight of Orobanche cumana decreased by 100.0％,56.2％and 36.4％significantly after treating with 1∶300,1∶600 and 1∶1200 diluted imazamox respectively.The dry weight of Orobanche cumana under 1∶1200 treatment was not significantly different from that of the control,while that of 1∶300 and 1∶600 treatments were significantly reduced by 100.0％and 45.1％,respectively.Therefore,treating with 1∶300 and 1∶600 dilution of imazamox can effectively inhibit the parasitism of Orobanche cumana,and can be used in combination with the herbicide-resistant sunflower variety Xinshi 1 to prevent and control the harm of Orobanche cumana in the field.
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