Longer-lasting Alion® herbicide provides a superior solution for pre-emergence control of a broad range of grass and broadleaf weeds, including resistant species. Alion is available for use in established grapes of at least 3 years of age. Alion contains a unique class of chemistry (cellulose-biosynthesis inhibitor) as its active ingredient (Group 29). Alion is the foundational herbicide offering excellent crop and environmental safety when used as directed. Alion provides up to 6 months of residual control, reducing the number of in-season sprays.