A method for controlling harmful plants resistant to active compounds from the group of the inhibitors of acetolactate synthase, acetyl coenzyme A carboxylase, photosynthesis at photosystem II, microtubuli arrangement, cell division or 5-enolpyrovylshikimate-3-phosphate synthase, in particular acetolactate synthase, is described.本發明係說明對於選自乙醯乳酸合成酶、乙醯輔酶A羧化酶、於光系統II之光合作用、微管安排、細胞分裂或5-烯醇丙酮酸莽草酸-3-磷酸合成酶,特別是乙醯乳酸合成酶之抑制劑之活性化合物具有抗性之有害植物的防治方法。