Residues left in the spray tank from a previous application can damage plants if the same equipment is used for a new application.

Residues left in the spray tank from a previous application can damage plants if the same equipment is used for a new application.

• A. True
• B. False
• C. Only for certain crops
• D. Only with certain pesticides

Answer: (A)

Residues left in a spray tank from a previous application can cause plant injury when the same equipment is used again because carryover can change the next spray’s composition or concentration. Even after some cleaning, trace amounts of the prior product can mix with the new formulation, potentially creating phytotoxic conditions for sensitive crops or for incompatible pesticide combinations. This is why labels call for proper tank management—dedicating tanks to certain products or thoroughly flushing and cleaning between uses according to the label—to prevent cross-contamination. The risk is not limited to specific crops or only certain pesticides; while some combinations are more hazardous, the potential for damage exists whenever equipment isn’t cleaned or dedicated between different applications.

Residues left in a spray tank from a previous application can cause plant injury when the same equipment is used again because carryover can change the next spray’s composition or concentration. Even after some cleaning, trace amounts of the prior product can mix with the new formulation, potentially creating phytotoxic conditions for sensitive crops or for incompatible pesticide combinations. This is why labels call for proper tank management—dedicating tanks to certain products or thoroughly flushing and cleaning between uses according to the label—to prevent cross-contamination. The risk is not limited to specific crops or only certain pesticides; while some combinations are more hazardous, the potential for damage exists whenever equipment isn’t cleaned or dedicated between different applications.