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水花生(革命草)、白茅(茅草)、野艾蒿、香附子(回头春)是危害最大的几种多年生杂草,由于难以根除,习惯上称之为顽固性杂草,又叫恶性杂草。这类顽固性杂草均具有十分发达的地下根茎,人工锄草只能铲除其地上部分,一般的化学除草剂也难以收到很好的杀灭地下根茎的效果。试验研究结果表明,采用41％农达水剂的防除效果最为理想,施药后30天烂根深度达到12厘米～15厘米,控草时间长达60天～90天。
Peanut (revolutionary grass), white grass (thatch grass), wild Artemisia, Cyperus rotundus (retrogressive spring) is the most endangered perennial weeds, difficult to eradicate, habitually known as intractable weeds, also known as malignant miscellaneous grass. These stubborn weeds are very well developed underground rhizomes, artificial weeding can only eradicate its aerial parts, the general chemical herbicides are also difficult to receive a good effect of underground rhizomes. The experimental results show that 41% Nongda agent has the best control effect. The rotten roots reach 12 cm ~ 15 cm 30 days after application, and the control time is 60 days to 90 days.