Cyhalofop-butyl is a selective post-emergence herbicide primarily used to control annual and perennial grass weeds in rice crops. It acts as an acetyl-CoA carboxylase (ACCase) inhibitor, disrupting fatty acid synthesis in target grasses, leading to cessation of growth and eventual plant death. This makes it highly effective against grassy weeds such as barnyardgrass, while being safe for broadleaf crops like rice. It is also utilized in integrated weed management programs and research for developing resistant weed control strategies. Application should follow label instructions to minimize environmental impact and resistance development.