Abstract: 【Objective】 Based on the synergistic use of synergists and herbicides, we focused on chemical control of ragweed Ambrosia artemisiifolia L. and giant ragweed Ambrosia trifida L. by reducing pesticide and increasing efficiency technique.【Method】 Field plot experiment was conducted to compare and analyze the field control effect of two under 15%, 30% and 50% reduction.【Results】 Jijian had better control effect on plant and fresh weight on the 45 days or 78 days after herbicide at 15%, 30% and 50% drug reduction levels with synergist, and the control effects were 64.23%-98.84% and 65.37%-98.09% respectively for ragweed or giant ragweed. At the level of 15%, 30% drug reduction, the control effects of the two herbicides were 99.24%, 97.59% and 100.00%, 97.69% respectively after 45 days or 78 days, the control effect of the treatment combined with synergist Jijian was 87.70%-98.65% and 88.77%-97.96%, respectively. And the control effect was similar to that of the plant with the optimum dosage in the field, and the difference was 0.59%-11.54% and 0.27%-11.23%, respectively. Under 50% drug reduction with synergist Jijian, the control effects were 54.30%-67.00% and 55.63%-67.14% respectively, and the control effect was lower than the sui Table dosage in the field, whose difference was 30.59%-44.94% and 30.55%-44.37% respectively.【Conclusion】 21% aminopyralid AS 17.50 mL /667m², 75% saflufenacil and glyphosate WG 42.00 mL /667m², the occurrence and damage of ragweed with plant height of 23 cm or so in May and 12 cm or so in June can be effectively controlled by adding synergists, so it is feasible to reduce the application rate by 30%, but the synergistic effect of different synergistic agents is different to some extent. In actual production, it is recommended to use the synergist Jijian 15.00 mL /667m², followed by synergist Orange Peel oil 15.00 mL /667m².

Key words: synergist; herbicide; ragweed; giant ragweed; control technique

摘要： 【目的】增效剂与除草剂协同使用,研究筛选化学防治豚草与三裂叶豚草的减施增效技术过程中施用的最佳药剂用量。【方法】采用田间小区试验,以2种除草剂的田间适宜用药量作为减药基线,对比分析2种增效剂在减药15%、30%和50%水平下协同使用处理下豚草与三裂叶豚草的田间防治效果。【结果】在防治三裂叶豚草与普通豚草时,添加增效剂在减药15%、30%和50%水平下药后45或78 d株防效和鲜重防效整体较好的是激健,防效分别为64.23%~98.84%和65.37%~98.09%。2种除草剂在田间适宜用药量处理下药后45 d或78 d的株防效分别为99.24%、97.59%和100.00%、97.69%,在减药15%、30%水平下与增效剂激健协同施用处理的株防效分别为87.70%~98.65%和88.77%~97.96%,与田间适宜用药量的株防效相当,分别相差0.59%~11.54%和0.27%~11.23%;在减药50%水平下与增效剂激健协同施用处理的株防效分别为54.30%~67.00%和55.63%~67.14%,低于田间适宜用药量的株防效,分别相差30.59%~44.94%和30.55%~44.37%。【结论】21%氯氨吡啶酸AS 17.50 mL/667m²、75%苯嘧·草甘膦WG 42.00 mL/667m²,合理添加增效剂可有效控制5月约6叶期株高为23 cm左右的三裂叶豚草和6月约8叶期株高为12 cm左右的豚草的发生与为害,减施30%可行,不同增效剂之间的增效作用存在一定差异。增效剂推荐使用激健15.00 mL/667m²,其次青皮桔油15.00 mL/667m²。

关键词: 增效剂, 除草剂, 豚草, 三裂叶豚草, 防控技术