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为筛选出对苗期高羊茅安全的除草剂，在室内盆栽条件下，测定了高羊茅苗期对除草剂的耐药性。结果表明，当氟乐灵、除草通的用量为１．１３、２．２５ｋｇ／ｈｍ２，农得时、草克星的用量为０．３０、０．４５ｋｇ／ｈｍ２，快杀稗的用量为０．６０、１．２０ｋｇ／ｈｍ２时，对高羊茅安全，对株高、地上部鲜重和叶色无显著影响。酰胺类的甲草胺、乙草胺和都尔对高羊茅的生长有严重的抑制作用，不宜用于高羊茅苗期除草。圃草定结果与酰胺类的药剂类似，因而也不宜在高羊茅苗期施用。当恶唑禾草灵的用量为０．４５、０．９０ｋｇ／ｈｍ２，恶草灵的用量为１．５、３．０ｋｇ／ｈｍ２时，抑制高羊茅的鲜重和株高，但随着草坪的修剪，生长恢复，抑制作用逐渐减轻，而且不影响草坪草新生茎叶的数量，表明苗期高羊茅对这２种除草剂在该剂量下有一定的耐药性。
In order to screen out the safe herbicide of tall fescue in seedling stage, the herbicide resistance of tall fescue seedling stage was determined in pot experiment. The results showed that when triflural, weeding pass the amount of 1.13, 2.25kg / hm2, when farming, the amount of grass nemesis 0.30,0.45kg / hm2, the amount of fast barnyardgrass 0. 60,1.20kg / hm2, the safety of tall fescue, plant height, aboveground fresh weight and leaf color had no significant effect. Amides such as alachlor, acetochlor and meld have a serious inhibitory effect on the growth of tall fescue, and are not suitable for weeding in tall fescue at seedling stage. Nursery results and amide similar to the agent, it is also not suitable for tall fescue seedling application. When the amount of oxazole grass spirits was 0.45,0.90kg / hm2, the amount of oxacillin was 1.5, 3.0kg / hm2, the fresh weight and plant height of tall fescue were inhibited. However, Lawn pruning, growth recovery, inhibition gradually reduced, and does not affect the number of turfgrass new stems and leaves, indicating that tall fescue seedlings of these two herbicides at this dose have a certain resistance.