Treat biennials in the rosette stage of growth and perennials such as Canada thistle in the bud stage. Treat susceptible woody perennials in spring after leaves are fully expanded. Be cautious of drift. For fescue, a minimum of 24 months is desirable. Apply to weeds in the spring or early summer before annual broadleaves are 4 inches tall.
Ryegrass is less tolerant than other grass species.
Do not apply to desirable legume-containing stands. Ally is persistent in soil, and crop rotation guidelines must be followed. Use the lower rates for susceptible annuals when they are small and actively growing. Treat biennials in the rosette stage of growth. Higher rates may be used for spot treatment of certain woody brush species.