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首页> 外文期刊>Indian Journal of Weed Science >Evaluation of Isopropazol against Isoproturon Resistant Biotypes of Phalaris minor
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Evaluation of Isopropazol against Isoproturon Resistant Biotypes of Phalaris minor

机译：异丙草胺对Ph的抗异丙草隆生物型的评价

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Isoproturon resistant biotypes of Phalaris minor have spread to over 1 m ha of N-W India causing a threat to the option of chemical weed control in wheat. The resistant biotypes have been found to degrade isoproturon by enhanced detoxification mediated by cyto P450 monooxygenase enzymes. Herbicides of different modes of action are required to combat the evolution of cross-resistance in weed species. Experiments were conducted to evaluate the efficacy of JV-485 (isopropazol) and Mon-37500 (sulfosulfuron) against the resistant (R) and susceptible (S) biotypes of P. minor and selectivity against wheat. Plants of Rand S biotypes and wheat were raised in a glasshouse and isopropazol was applied pre-emergence; isoproturon and sulfosulfuron (±0,2% surfactant) were applied post-emergence 21 days after sowing (DAS) at the 2-3 leaf stage of P. minor and 3-5 of wheat and 35 DAS at 4-6 leaf stage of P. minor with four replicate pots for each treatment. Plants were sprayed using a motorized track sprayer fitted with a flat fan even spray nozzle at 300 kPA pressure delivering 2001 water/ha. Observations were periodically recorded for visual mortality and fresh/dry weights were recorded 4-6 weeks after treatment (WAT). Wheat was relatively safe to the treatments of isopropazol upto 100 g/ha which was >16 times the GR^ values for the P. minor biotypes. Mon-37500 was equally safe to wheat and there was no growth inhibition at 20 g/ha (+surfactant). Both these herbicides were highly effective against isoproturonresistant biotypes of P. minor. Mon-37500 was effective even upto 4-6 leaf stage of P. minor, some variations though were observed among the biotypes. Surfactant (0.2% Mon-0818) enhanced the efficacy of Mon-37500 and is desired to use under field conditions.
机译：印度ala的抗异丙草隆生物型已蔓延到印度西北部超过100万公顷，对小麦化学除草的选择构成了威胁。已发现抗性生物型可通过细胞P450单加氧酶介导的增强解毒作用降解异丙隆。需要不同作用方式的除草剂来对抗杂草物种中交叉抗性的进化。进行实验以评估JV-485（异丙醇）和Mon-37500（磺基磺隆）对次要抗性（P）和易感性（S）生物型小白菜的功效以及对小麦的选择性。在温室中种植兰德S型和小麦的植物，并在出苗前施用异丙唑。播种后21天（DAS），在小杆次生2-3叶期和小麦3-5叶和3-5DAS在4-6叶期芽后施用异丙隆和磺基磺隆（±0.2％表面活性剂）。小P.小号，每个处理有四个重复的盆。使用装有平扇均匀喷雾喷嘴的机动履带喷雾器以300 kPA的压力向植物喷洒2001水/公顷。定期记录观察结果的视觉死亡率，并在治疗后（WAT）4-6周记录新鲜/干重。小麦对高达100 g / ha的异丙唑处理相对安全，这是次生毕赤酵母生物型GR ^值的> 16倍。 Mon-37500对小麦同样安全，在20 g / ha（+表面活性剂）下没有生长抑制作用。这两种除草剂均对次要抗小虫的异丙隆抗生物型非常有效。 Mon-37500甚至在小至4.-6个叶期均有效，尽管在生物型之间也观察到一些变化。表面活性剂（0.2％，Mon-0818）增强了Mon-37500的功效，希望在野外条件下使用。

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