If spraying equipment used for phenix herbicides is not cleaned before applying another pesticide, what risk may occur?

• A. Spray residue causing crop injury
• B. No risk whatsoever
• C. Increased efficiency of application
• D. Shorter spray intervals

Answer: (A)

Cross-contamination is the key idea. If the sprayer isn’t cleaned after using a phenix herbicide, residues stay in the tank, hoses, and nozzles. When you switch to another pesticide, those residues mix with the new product, which can change the formulation or cause an incompatible combination. That often leads to crop injury or phytotoxicity, especially on sensitive crops. So, there is a real risk. The other options don’t fit: there wouldn’t be no risk, application efficiency wouldn’t necessarily improve, and spray intervals aren’t affected by leftover residues.