几种除草剂对加拿大一枝黄花的防除效果评价

Evaluation of the control effects of several herbicides on Solidago canadensis

为了筛选出防控加拿大一枝黄花的有效药剂,于2023年在加拿大一枝黄花苗期,选用了6种化学除草剂进行防除试验,分别于药后7、27、42、55、180 d观察药害中毒症状和药后42、180 d调查防除效果。结果表明,在供试的6种除草剂中,以667 g/L三氯吡氧乙酸·丁氧基乙酯EC对加拿大一枝黄花的防效最好,表现为地上部分和地下根系基本枯死,且持效期长,无新苗萌发,药后42、180 d时株防效分别达98.0%和96.9%,可作为替代药剂推荐用于有效防除加拿大一枝黄花。33%草甘膦异丙胺盐AS+20%氯氟吡氧乙酸异辛酯EC的混用处理,在前期表现较好,但后期会有一定数量的新苗出生。其他处理根系死亡率不高,后期新苗萌发较多。

In order to screen out effective agents for preventing and controlling Solidago canadensis,in 2023,during the seedling stage of S.canadensis,six chemical herbicides were selected for control tests.Symptoms of phytotoxicity were observed at 7,27,42,55,and 180 days after treatment,and control effects were investigated at 42 and 180 days after treatment.The results showed that among the six herbicides tested,triclopyr-butoxyethyl ester 667 g/L EC had the best control effect on S.canadensis,showing that the aboveground part and underground root system were basically withered,with a long duration of efficacy and no new seedlings germinated.The plant control effects at 42 and 180 days after treatment reached 98.0% and 96.9% respectively.It can be recommended as a substitute agent for effectively controlling S.canadensis.The mixed treatment of glyphosate-isopropylammonium 33% AS + fluroxypyr-mepthyl 20% EC performed well in the early stage,but a certain number of new seedlings will be born in the later stage.For other treatments,the root mortality rate is not high,and there are more new seedlings germinating in the later stage.