For water under 10 acres, what is the maximum yearly sum of all fluridone applications?

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

Answer: (A)

The key idea is that small water bodies have an annual cap on how much fluridone you can apply in total. For waters under 10 acres, the label restricts the sum of all applications over a year to 90 ppb. This means when you plan treatments, you add up the concentration equivalents of each application and must not exceed 90 ppb in a 12-month period. If a plan would push the total above that limit, you’d need to adjust—either reduce doses or space treatments out more.

The option of 90 ppb is the highest amount allowed within that yearly limit, so it’s the correct choice. Values like 50 ppb are below the cap and not the maximum, while 120 ppb and 150 ppb would exceed the label’s annual limit.