The following sulfonylureas have been commercialized for weed control: amidosulfuron, azimsulfuron, bensulfuron-methyl, chlorimuron-ethyl, ethoxysulfuron, flazasulfuron, flupyrsulfuron-methyl-sodium, halosulfuron-methyl, imazosulfuron, nicosulfuron, oxasulfuron, primisulfuron-methyl, pyrazosulfuron-ethyl, rimsulfuron, sulfometuron-methyl Sulfosulfuron, terbacil, bispyribac-sodium, cyclosulfamuron, and pyrithiobac-sodium. Nicosulfuron, triflusulfuron methyl, and chlorsulfuron are broad-spectrum herbicides that kill plants by inhibiting the enzyme acetolactate synthase. In the 1960s, more than 1 kg/ha (0.89 lb/acre) crop protection chemical was typically applied, while sulfonylureates allow as little as 1% as much material to achieve the same effect. COUNT 4
QSN1 What are sulfonyureas commonly used for? ANS1 weed control QSN2 Nicosulfuron, triflusulfuron methyl and chlorsulfuron can be classified as what type of pesticides? ANS2 broad-spectrum herbicides QSN3 The restriction of what enzyme allows broad-spectrum herbicides to kill plants? ANS3 acetolactate synthase QSN4 The amount of material used as a crop protection measure decreased from 1kg/ha in what year to its current 1%? ANS4 1960s