50%二氯喹啉酸WP替代药剂的筛选

为筛选出50%二氯喹啉酸WP的替代药剂,选择30%氯酰草膦EC、33.6%苯吡唑草酮SC、315 g/L异噁唑草酮·噻酮磺隆SC作为替代药剂与50%二氯喹啉酸WP在同一玉米地进行田间试验。结果表明:30%氯酰草膦EC除草效果及对玉米的安全性均未达到50%二氯喹啉酸WP同等水平,不宜作为替代药剂;33.6%苯吡唑草酮SC杂草防治效果与50%二氯喹啉酸WP相当,玉米的生长情况与50%二氯喹啉酸WP差异不显著,虽可以降低二氯喹啉酸的药害风险,但考虑到用药成本和半衰期远大于50%二氯喹啉酸WP,亦不宜作为替代药剂;315 g/L异噁唑草酮·噻酮磺隆SC的除草效果优于50%二氯喹啉酸WP,且易降解,可作替代药剂用于玉米-烤烟轮作区玉米地杂草防除,可以解决二氯喹啉酸对后茬烟草的药害问题。

Screening of the Alternative Herbicide to Replace 50% Quinclorac WP

In order to screen for alternative herbicide to replace 50% of quinclorac WP, 30% chloramphenicol EC, 33.6% phenylpyrazolone SC, and 315 g / L isoxazolone thiafenosulfuron SC were selected as substitute and were performed field test with 50% quinclorac WP in the same maize field.The results showed that the herbicidal effect of 30% chloramphenicol EC and its safety effect to maize did not reach the same level of 50% quinclorac WP, so that should not be used as an alternative.Weed control effect by 33.6% benzopyrazone SC was equivalent to that of 50% quinclorac WP, while maize growth had no significant difference with applying 50% of quinclorac WP.Although it can reduce the risk of phytotoxic injury, it was not suitable as an alternative taking into account the cost and half-life, which was far greater than that of 50% Chlorethiclovir.Herbicidal effect of 315 g/ L isoxazole oxazolone thiafenosulfuron SC was better than that of 50% quinclorac WP, and was ready to degradation.It can be used as a substitute in maize-tobacco rotation zone for weed control in corn fields, and can solve the phytotoxic injury problem of 50% quinclorac WP to tobacco, the subsequent crop of maize.