目的:筛选出防除碎米知风草的高效除草剂,为田间防治碎米知风草提供选药依据。方法:通过整株生物测定法,明确水稻田20种除草剂对碎米知风草的生物活性,并选取其中7种高活性药剂进行田间防效评价。结果:土壤处理药剂丁草胺、丙草胺、莎...目的:筛选出防除碎米知风草的高效除草剂,为田间防治碎米知风草提供选药依据。方法:通过整株生物测定法,明确水稻田20种除草剂对碎米知风草的生物活性,并选取其中7种高活性药剂进行田间防效评价。结果:土壤处理药剂丁草胺、丙草胺、莎稗磷、乙氧氟草醚、噁草酮、环戊噁草酮、二甲戊灵、仲丁灵、硝磺草酮、扑草净和茎叶处理药剂吡唑喹草酯、苯丙草酮、噁唑酰草胺、敌稗、禾草丹对碎米知风草的活性较高,GR90分别为140.47、41.39、92.08、2.92、153.91、34.03、16.76、65.97、7.37、130.30、144.93、68.70、80.46、2520.32、1918.3 g a.i./hm2,均低于各自的田间推荐剂量。结果表明,药后45 d,土壤处理药剂二甲戊灵、丙草胺、仲丁灵及茎叶处理药剂敌稗、苯丙草酮在推荐剂量下对其防效最高,鲜质量防效为82.95%~92.32%。结论:该5种药剂在推荐剂量时对碎米知风草均有较高防效,在田间防除此种杂草时应结合当地用药现状优先选用。展开更多
With the increase of herbicide-resistant weeds, novel, more selective and even more potent herbicides to control weeds are needed. In this paper, a series of N-fluorinated phenyl-N＇-pyrimidyl urea derivatives were sy...With the increase of herbicide-resistant weeds, novel, more selective and even more potent herbicides to control weeds are needed. In this paper, a series of N-fluorinated phenyl-N＇-pyrimidyl urea derivatives were synthesized and screened for their herbicidal activities against Amaranthus retroflexus （AR） and Setaria viridis （ SV）. Compound 2S （N-（3-trifluoromethylphenyl）-N＇-（2-amino-4-chloro-6-methylpyr- imidyl） urea） exhibited marked herbicidal activity against SV（IC50 =11.67 mg/L） and is more potent than bensulfuron （IC50= 27.45 mg/L）, a commercially available herbicide. A statistically significant CoMFA model with high prediction abilities （q2 = 0.869, r2 = 0.989） was obtained.展开更多
文摘目的:筛选出防除碎米知风草的高效除草剂,为田间防治碎米知风草提供选药依据。方法:通过整株生物测定法,明确水稻田20种除草剂对碎米知风草的生物活性,并选取其中7种高活性药剂进行田间防效评价。结果:土壤处理药剂丁草胺、丙草胺、莎稗磷、乙氧氟草醚、噁草酮、环戊噁草酮、二甲戊灵、仲丁灵、硝磺草酮、扑草净和茎叶处理药剂吡唑喹草酯、苯丙草酮、噁唑酰草胺、敌稗、禾草丹对碎米知风草的活性较高,GR90分别为140.47、41.39、92.08、2.92、153.91、34.03、16.76、65.97、7.37、130.30、144.93、68.70、80.46、2520.32、1918.3 g a.i./hm2,均低于各自的田间推荐剂量。结果表明,药后45 d,土壤处理药剂二甲戊灵、丙草胺、仲丁灵及茎叶处理药剂敌稗、苯丙草酮在推荐剂量下对其防效最高,鲜质量防效为82.95%~92.32%。结论:该5种药剂在推荐剂量时对碎米知风草均有较高防效,在田间防除此种杂草时应结合当地用药现状优先选用。
基金supported by the National Natural Science Foundation of China(No.30900935)the Fundamental Research Funds for the Central Universities(Nos.2011PY086,2011PY039)
文摘With the increase of herbicide-resistant weeds, novel, more selective and even more potent herbicides to control weeds are needed. In this paper, a series of N-fluorinated phenyl-N＇-pyrimidyl urea derivatives were synthesized and screened for their herbicidal activities against Amaranthus retroflexus （AR） and Setaria viridis （ SV）. Compound 2S （N-（3-trifluoromethylphenyl）-N＇-（2-amino-4-chloro-6-methylpyr- imidyl） urea） exhibited marked herbicidal activity against SV（IC50 =11.67 mg/L） and is more potent than bensulfuron （IC50= 27.45 mg/L）, a commercially available herbicide. A statistically significant CoMFA model with high prediction abilities （q2 = 0.869, r2 = 0.989） was obtained.
