Pesticide-fertilizer mixtures: Are pesticides allowed to be applied in a pesticide-fertilizer mixture?

• A. The pesticide-fertilizer mixture is never allowed
• B. Pesticides can be mixed with fertilizer unless prohibited by the label
• C. Only with EPA approval
• D. Only in greenhouse conditions

Answer: (C)

Mixing a pesticide with fertilizer creates a tank mix that isn’t automatically covered by the product label. The label governs how a pesticide may be used, and if a fertilizer is involved, that use is considered a new use. To be legal, that specific mixture must have EPA review and approval (or an updated label/registration that covers the tank mix). That’s why the correct choice is that such a mixture is allowed only with EPA approval. It isn’t an absolute prohibition in every case, but you cannot rely on a general permission or a greenhouse-only exception; you must have explicit EPA-approved authorization for the exact mix and application conditions. Always check the label and, if in doubt, seek EPA approval or guidance from the registrant or state regulatory agency.