25g/l氯氟吡啶酯EC防除直播稻田杂草的防效和安全性研究

为探索25g/l氯氟吡啶酯EC在推荐剂量下,防除直播水稻田杂草效果、杀草谱,安全性及施药技术等指标,采取茎叶喷雾施药、定期调查的方法进行田间药效试验。结果表明：氯氟吡啶酯杀草谱主要包括禾本科杂草、阔叶杂草及莎草科杂草,但对千金子无效；施药时间为直播水稻4~6叶期,推荐剂量为15~30ga.i./hm²,施药后25d对阔叶杂草综合防除效果达100%,与氰氟草酯混合使用,对千金子防效更好。建议在直播稻4~6叶期,25g/l氯氟吡啶酯EC22.5~30ga.i./hm²+100g/l氰氟草酯EC100~150ga.i./hm²混合喷施可以有效防除直播稻田杂草危害,水稻生长安全。

The effect and safety of controlling weeds in direct-seeded rice field with 25g/l florpyrauxifen EC

The study aims to deplore the criterion of controlling weed spectrum,safety and application technology of 25g/l florpyrauxifen EC at recommended dose in direct-seeded rice field. This experiment was carried out by means of stems-leaves spray and regular survey. The result showed that weed spectrum included grass weed, broad-leave and sedge weed, but it is ineffective to AsianSsprangletopthe; the suitable application time is at 4~6 leaf stage, at recommended dose of 15~30ga.i./hm_², the comprehensive control effect on broad-leave reached 100% after 25 days, the control effect was better with cyhalofop-butyl in combination. At 4~6 leaf stage in direct-seeded rice field, by spraying on weeds combination of 25g/l florpyrauxifen EC at dose of 22.5~30ga.i./hm_²and 10% cyhalofop-butyl EC at dose of 100~150ga.i./hm_², weeds can be controlled effectively in direct-seeded rice field, it was safe on rice growth in recommended dose.