不同除草剂单独相继使用和混合使用防除小麦田虉草的效果比较(英文)

The Effect of Sequential and Mixed Application of Herbicides on Control of Littleseed Canary Grass in Wheat Field

草是小麦田的主要杂草 ,尤其是水稻—小麦复种田块发生较为严重。用异丙隆防除 草已有 2 0多年的历史 ,防治效果十分显著。但近来有研究表明 草已具有对异丙隆的抗性。本试验研究了不同除草剂单独相继使用与混合使用对该杂草的防治效果。结果表明 ,播后 60 d,出苗前喷施氟乐灵和第一次灌水后喷施异丙隆的处理 ,除草效果最佳 ,而在成熟期 ,第一次灌水后喷施噻黄隆的处理具有与以上处理同样的防治效果。虽然使用异丙隆的处理产量最高 ,但一些除草剂单独相继使用也具有很好的杂草防治效果 ,小麦产量显著高于未用除草剂的对照。作者认为 ,在 草防治上存在有异丙隆抗性的地区 。

Littleseed canary grass ( Phalaris minor Retz) is a major weed in wheat field particularly in the rice wheat cropping system. Isoproturon has been used for control of littleseed canary grass for about two decades with remarkable success. However, recent reports have indicated that this weed has developed resistance to isoproturon. An attempt was, therefore, made to study the efficacy of different herbicides applied alone, in sequence or as tank mixture to control this troublesome weed in wheat field. At 60 DAS (day after sowing), application of trifluralin as pre em followed by application of isoproturon AFI (after first irrigation) caused the maximum reduction in weed population, but at harvest, application of sulfasulfuron applied AFI had the same effect in weed control. Although isoproturon produced the maximum grain yield closely followed by clodinafop, sequential application of some herbicides also provided effective weed control and produced significantly higher seed yield than weedy check. So where there is a problem of isoproturon resistance to littleseed canary grass, these alternate herbicides may be used.