For water bodies larger than 10 acres, the max annual sum of fluridone applications is

• A. 120 ppb
• B. 150 ppb
• C. 50 ppb
• D. 90 ppb

Answer: (B)

Understanding regulatory limits for annual fluridone applications is about knowing how much of the chemical you’re allowed to introduce into a lake in one year. For water bodies larger than 10 acres, the total amount you can apply over the year is capped at 150 ppb. This ceiling balances the need to effectively control aquatic weeds with the goal of protecting aquatic life and water quality from cumulative exposure. If multiple applications are used, their combined contributions must not exceed that 150 ppb limit. The other numbers represent lower caps that would restrict treatment in larger waters, so 150 ppb is the appropriate upper limit for lakes over 10 acres.