15种除草剂对不同生长时期豚草的防效评价

为了筛选对不同生长时期豚草有高效防除作用的除草剂，笔者用盆栽豚草研究了15种茎叶处理除草剂对幼苗期和成株期豚草的防效。结果表明，供试的4种灭生性除草剂中，百草枯、草甘膦、草铵膦和环嗪酮在试验有效剂量内对苗期和成株期豚草均有较好防效，其中草甘膦和草铵膦对成株期豚草防效优于百草枯和环嗪酮；11种选择性除草剂中，乳氟禾草灵、三氯吡氧乙酸、乙氧氟草醚、灭草松、2甲4氯钠盐、2,4-滴丁酯、氯氟吡氧乙酸和麦草畏对苗期豚草均有较好防效，但对成株期豚草，仅三氯吡氧乙酸和乳氟禾草灵表现出较高防效。噻吩磺隆、吡嘧磺隆和苯磺隆3种磺酰脲类除草剂对豚草防效较差。试验结果表明，豚草植株的大小对不同茎叶处理除草剂的敏感性存在很大差异。

Chemical Control Abilities of 15 Kinds of Herbicides on the Seedlings and Mature Plants of Ragweed (Ambrosia artemisiifolia L.)

In order to selecte effective herbicides against ragweed,the chemical control abilities of 15 kinds of postemergence herbicides was tested on the seedling and mature stage of potted ragweed.The results showed that 4 kinds of no selective herbicides i.e.Glyphosate,Glufosinate-ammonium,Paraquat and Hexazinone had superior effect on ragweed control in both stages,but Glyphosate and Glufosinate-ammonium were more effective to mature plants than Paraquat and Hexazinone.Among 11 selective herbicides,Lactofen,Oxyf...