3种苯氧羧酸类除草剂防除薇甘菊药效研究

经药剂筛选、盆栽药效比较试验和小区药效表证，结果表明：2，4-D钠盐、2，4-D丁酯2种苯氧羧酸类除草剂防除恶性杂草薇甘菊是较理想的药剂，能够有效地控制其生长和危害；施药部位以植株的中部和上部效果最好；在其药液中添加表面活性剂，能够提高杀灭薇甘菊活性：不同生长阶段的薇甘菊对苯氧羧酸类除草剂的敏感性有明显差异，以幼苗期至生长盛期防效最高，开花后耐药性明显提高；2甲4氯防除薇甘菊达不到防治上要求。

Phenoxy-hydroxy-acid herbicides for controlling the weed Mikania micrantha

The results from pot experiment, plot test and pharmacelltical product selection by sifting were showed that the phenoxy-hydroxy-acid herbicides such as 2,4-D-Na, 2,4-D butylate and Banvel were highly active to distress weed Mikania micrantha, effective to keep off M. micrantha and control its growth. The best results of the different application parts were both in the top part and the middle parts of the plants. The effects could be improved by adding SDS into phenoxy-hydroxy-acid herbicides. M. micrantha had different sensibilities to phenoxy-hydroxy-acid herbicides in different development stages from seedling to peak of growing season. The drug resistance can be improved from early flowering growth; MCPA-Na was unefficient in controlling M. micrantha.