4种吡啶类除草剂对不同生长期 飞机草的防效评价

飞机草（Eupatorium odoratum L.）是入侵我国南部的重要恶性杂草为了筛选对不同生长期飞机草具有高 效防除效果的除草剂以常用除草剂41%草甘膦水剂2 250~9 000 g/hm2为对照，利用48%三氯吡氧乙酸乳油 （3 750~6 255 mL/hm2）24%氨氯吡啶酸水剂（1 125~3 375 mL/hm2）75豫二氯吡啶酸可溶性粒剂（134~240 g/hm2）和 20%氯氟吡氧乙酸乳油750~1 050 mL/hm24 种吡啶类除草剂对苗期生长中期成株期飞机草进行防除试验结果 表明三氯吡氧乙酸对不同生长时期飞机草均有较好的防效，其中对苗期飞机草的防效与草甘膦相似对生长中期 和成株期飞机草的防效均优于草甘膦。氨氯吡啶酸对苗期飞机草的防效比草甘膦稍差，对生长中期和成株期飞机草 的防效与草甘膦相近，二氯吡啶酸和氯氟吡氧乙酸仅在高剂量下对苗期飞机草的防效相对较好对生长中期和成株 期飞机草的防效均较差。

Control effects of four pyridine herbicides on Eupatorium odoratum L. at different growth stages

Eupatorium odoratum L. is an important invasive weed in south China. In order to select effective and security herbicide to control E.odoratum at different growth stages, four pyridine herbicides including, 48% triclopyr EC (3 750~6 255 mL/hm2), 24% picloram AS (1 125~3 375 mL/hm2), 75% clopyralid SGX (134~240 g/hm2), and 20% fluroxypyr EC (750~1 050 mL/hm2) were tested for the effectiveness to control E.odoratum at seedling stage, middle growth stage, and adult stage with the control of 41% glyphosate AS (2 250~9 000 g/hm2). Results showed the control effect of triclopyr on E.odoratum were good was similar with that of glyphosate at seedling stage and was higher than that of glyphosate at middle growth stage and adult stage. The control effect of picloram on E.odoratum lower than that of glyphosate and was similar with that of glyphosate at middle growth stage and adult stage. The control effects of clopyralid and fluroxypyr on E.odoratum were relatively poor at three different growth stages except for high dose at seedling stage.