Experimental use permits required under Section 5 of FIFRA can be used when conducting experimental field tests on new pesticides or new uses of pesticides on:

• A. 10 or more acres of land or 1 or more acres of water
• B. 5 acres of land
• C. 100 acres of land
• D. 1 acre of water only

Answer: (A)

Experimental Use Permits under Section 5 of FIFRA are needed when you’re field-testing pesticides that aren’t registered yet or you’re testing a new use. The permit requirement kicks in based on the size of the test site: if you’re testing on ten or more acres of land, or on one or more acres of water, you must have an EUP before starting. This ensures EPA oversight for field trials that could involve more substantial environmental exposure. The option that matches these minimums—ten or more acres of land or one or more acres of water—best reflects the rule. The other choices describe test sizes that don’t meet the stated thresholds for triggering an EUP.