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[目的]明确海南香蕉园主要杂草小飞蓬(Erigeron canadensis)对百草枯的抗药性水平。[方法]利用温室生物测定法测定海南省昌江、白沙、乐东、澄迈、五指山和陵水小飞蓬种群对百草枯的抗药性,并研究1 200 g a.i./hm2百草枯茎叶喷雾处理后不同小飞蓬种群SOD和POD活性。[结果]抗药性水平最高的为白沙香蕉园小飞蓬种群,相对抗药倍数(IR)达到了17.81,抑制中剂量ED50达11 588.06 ga.i./hm2;其次为乐东小飞蓬种群,IR达到11.47,ED50达7 460.51 g a.i./hm2。白沙小飞蓬SOD活性最高,为6.88 U/g FW,陵水对照种群的活性最低,二者相差10倍;昌江和白沙的小飞蓬种群POD活性显著高于五指山、乐东和陵水,但与澄迈的没有显著差异。[结论]海南省部分香蕉园小飞蓬对百草枯已产生不同程度的抗药性,应该采取综合防治措施,减少小飞蓬种群抗药性的发生。
[Objective] The research aimed to determine the resistance of paraquat to Erigeron canadensis, a major banana plant in Hainan banana field. [Method] Greenhouse bioassay was used to measure the resistance to paraquat in the populations of Changjiang, Baisha, Ledong, Chengmai, Wuzhishan and Lingshui of Hainan Province, and the effects of 1 200 g ai / hm2 paraquat leaf spray were studied Activities of SOD and POD in different populations of. [Result] The highest resistant level was Banana Banana population, the relative resistant ratio (IR) reached 17.81 and the middle dose of ED50 reached 11 588.06 ga.i./hm2. Reached 11.47 and ED50 reached 7 460.51 g ai / hm2. The highest activity of SOD was 6.88 U / g FW and the lowest in Lingshui control group, the difference was 10 times. The POD activity of P. euphratica in Changjiang and Baisha was significantly higher than that in Wuzhishan, Ledong and Lingshui, Chengmai no significant difference. [Conclusion] Some banana plantlets in Hainan Province had different levels of resistance to paraquat, and should take comprehensive prevention and control measures to reduce the occurrence of drug resistance in.