稻田稗属杂草田间种群对五氟磺草胺的抗性监测

五氟磺草胺是一种乙酰乳酸合成酶抑制剂类除草剂。为探明稻田稗草对五氟磺草胺的抗性现状，采用整株生物测定法测定了采自中国7省70地稻区的稗草田间种群对五氟磺草胺的抗性。结果表明:所监测的稗草种群对五氟磺草胺均产生了不同程度的抗性，其中高水平抗性种群达50.0%，中水平抗性种群达47.1%，低水平抗性种群为2.9%，无敏感种群。在湖北、安徽、宁夏和黑龙江4省中，高水平抗性种群均达60%以上；其他3省的高水平抗性种群也在25%以上。湖南、江西和江苏3省中等水平抗性种群均在60%以上，其他4个省份在20.0%~40.0%之间。湖北省和黑龙江省低水平抗性种群分别为10.0%和12.5%，其他5个省份均无低水平抗性种群。本研究揭示了中国主要稻区稗草田间种群对五氟磺草胺的抗性现状，可为合理应用五氟磺草胺防控稻田稗草提供理论依据。

Resistance detection of field populations of Echinochloa spp. to penoxsulam

Penoxsulam is a new acetolactate synthase inhibitor (ALS) herbicide developed by Dow AgroSciences. In order to explore the sensitivity of Echinochloa spp. to penoxsulam on rice field, whole-plant bioassay experiments were conducted to evaluate the resistance level of 70 field populations of Echinochloa spp. from main rice production in seven provinces of China. The results showed that 50.0% of the 70 populations had evolved high resistance, 47.1% of the populations was moderate resistance, and only 2.9% of the populations exhibited low resistance. None populations were sensitive to penoxsulam. More than 60% of the populations had evolved high resistance from Hubei, Anhui, Ningxia and Heilongjiang Province. The populations of high level resistance was more than 25% in other three province. More than 60% of the population with moderate level resistance were from Hunan, Jiangxi and Jiangsu Province, and the populations of 20.0%-40.0% were also with moderate level resistance in others 4 provinces. The 10.0% and 12.5% of population were with low level resistance in Hubei and Heilongjiang Province, while other 5 provinces had no low level resistant populations. This work investigated the evaluation and monitoring of the field resistance of populations of Echinochloa spp. to penoxsulam, which provided a theoretical basis for the scientific application of penoxsulam to control Echinochloa spp. in the main rice cultivation area.