Studies On Herbicide-resistance Of Avena Fatua L. And Bromus Tectorum Linn Populations To Haloxyfop-rmethyl

Avena fatua L. and Bromus tectorum L. are serious weeds. Because of its fast reproduction, lots of ways of transmission, renewable ability strong, life cycle is usually shorter than crops and weeds, strong regeneration capacity, high photosynthetic efficiency, and the effect of the ventilation pervious to light of field crops. They also struggled for the space, light, water and nutrients with field crops. They have great harm. In recent years, the farmers say, The control efficiency of Avena fatua L. and Bromus tectorum L. Populations to Haloxyfop-Rmethyl is falling. As the Dose increase, herbicides weeding effect still is not good. For these reasons, the research of Avena fatua L. and Bromus tectorum L. to Haloxyfop-Rmethyl is imminent. The main work of this experiment and the results are these:1. Widely collected weed samples. Collecting 29 Avena fatua L. population and 18 Bromus tectorum L. populations. Studies on herbicide-resistance of Avena fatua L. and Bromus tectorum L. Populations to Haloxyfop-Rmethyl of these species. Then determine the highest resistance of Avena fatua L. populations is MenYuan Qingshizu, the highest resistance of Bromus tectorum L. populations is QiLian Binggou. the method of seed bioassay is consistent with that of the whole plant assay.2. The resistant levels of the following year is consistent with the monitoring results, the highest resistance of Avena fatua L. populations is still the MenYuan Qingshizu population, we do not collected QiLian Binggou population of Bromus tectorum L.. But in other parts, the resistance of Bromus tectorum L. level is still relatively low.3. The biochemical indexes of Avena fatua L. and Bromus tectorum L. Populations to Haloxyfop-Rmethyl shows that resistant populations of chlorophyll, MDA, SOD, CAT content were no obvious difference with CK.4. The results of the metabolic enzyme of Avena fatua L. and Bromus tectorum L. for Haloxyfop-Rmethyl show that, under the condition of not applying pesticide, The difference of GSTs and cytochrome P450 activity of resistant populations and sensitive populations of Avena fatua L. and Bromus tectorum L. is not obvious. After applying pesticide, resistant populations activity is significantly higher than the sensitive populations. And after applying pesticide, the activity are overall than not applying pesticide processing.5. The interacte resistance results showed, Avena fatua L. and Bromus tectorum L. are resistance of the interaction, but its for different drugs.