为了明确草甘膦与2,4-D混配后防治薇甘菊的效果，采用温室盆栽试验，计算出2种除草剂复配后对薇甘菊的鲜重防效，结合等效线法评价二者的最佳配比。研究结果表明：2种药剂混用对薇甘菊具有增效作用，在草甘膦和2,4-D(153.75，175)到(170.65，161)两等效线坐标点之间范围地上部增效作用最明显，此两点的相互作用指数为1.58和1.60；而草甘膦和2,4-D(153.75，203.15)到(202.76，161)两等效线坐标点之间范围根部增效作用最明显，此两点相互作用指数为1.48和1.53。可见，草甘膦153.75~170.65 g a.i./hm2与2,4-D 161~175 g a.i./hm2的配比范围内对地上部的防效达到了最佳增效作用，而草甘膦153.75~202.76 g a.i./hm2与2,4-D 161~203.15 g a.i./hm2的配比范围内对根部的防效达到了最佳增效作用。

To clarify the interaction of glyphosate and 2,4-D on the prevention and control of Mikania micrantha, The potting test was carried out in the Greenhouse. The control effects of the two herbicides on mikania micrantha were calculated. The best matching was evaluated by equivalent line. The results showed that there was significant synergism on mikania micrantha with glyphosate and 2,4-D. The most obvious synergism on the shoot inhibition is between the scope of (153.75 to 170.65 g a.i./hm2) and (161 to 175 g a.i./hm2), this index of interaction reached 1.58 and 1.60. But the most obvious synergism on the root inhibition is between the scope of (153.75 to 202.76 g a.i./hm2 )and (161 to 203.15 g a.i./hm2), the index of interaction reached 1.48 and 1.53. The best synergism ratio range of glyphosate and 2,4-D on shoot were 153.75-170.65 g a.i./hm2 161-175 g a.i./hm2 respectively, but the best synergism ratio range of glyphosate and 2,4-D on root were 153.75-202.76 g a.i./hm2 161~203.15 g a.i./hm2 respectively.