RESPONSES OF DIFFERENT FUNGAL AND PLANT-SPECIES TO ACETOLACTATE SYNTHASE INHIBITORS AND THEIR DERIVATIVES

The effect of sulfonylurea (SU) acetolactate synthases (ALS) inhibitor s (chlorsulfuron and triasulfuron) and their 13 guanidine and 7 azole derivatives was studied on 17 fungal and 21 plant species. The efficac y of chlorsulfuron and triasulfuron against Fusarium oxysporum and Thi elaviopsis basicola was higher than carbendazim. Two azole derivatives were highly selective for maize. The antifungal activity spectrum of both guanidine and azole derivatives differed from that of chlorsulfur on and triasulfuron, and did not exert notable antifungal activity in vitro. However, they had significant anti-fusarium efficacy on rye tha t surpassed that of carbendazim.