我国稻田稗草对丁草胺的抗药性研究

STUDY ON THE RESISSTANCE OF THE BARNYARDGRASS IN THE PADDY FIELDS TO THE BUTACHLOR IN CHINA

从1990年开始,针对我国三大类型水稻区稗草的化学防除历史,采用四种系统的方法,测定了稗草对丁草胺的抗药性水平.结果显示:丁草胺使用年限在5年以下地区的稗草,未测得其有明显的抗药性,但使用年限在8～12年的,产生了比较明显的抗药性.抗性水平由北向南有逐渐明显增高的趋势,双季稻区高于单季稻区,单双季稻区处于两者之间.毒力抗性比值在1.9～2.9;α-淀粉酶活性比为2.3～4.1;等浓度效果降低2/3;生长量敏感性比为2.5～4.

Herbicides have been used over thirty years in China. We have selected the resistance of barnyardgrass in Chinese three types of rice fields as the research target since 1990. Four systems of methods to analyse and determine the resistance's level of the barnyardgrass to the botachor were esnpfoyed, The reonlts showed that the barnyardgass did not have the obvious resistance when the butachlor was used for lass than five yean. But when it was nod for 8 - 12 years, the bamyardgnus appeared to have obvious resistance to the butachlor. Resistance level gradually increased from north to south. The resistance level was higher in two rice crops area than in one rice crop area, and in the one and two rice crops area the resistance is in between. The rate of toxcity resistance was 1. 9-2.9: the activity rate of the α-amylase was 2. 3-4.1 : the effects of equal concentration dropped 2/5: the susceptible rate of growth quantityy was 2. 5-4. 0.