Which is a disadvantage of EC and ULV formulations?

• A. They are more expensive
• B. Solvents may cause deterioration of rubber or plastic hoses, gaskets, and pump parts and surfaces
• C. They have shorter shelf life
• D. They cause more drift

Answer: (B)

The main idea here is about compatibility with spray equipment. EC and ULV formulations rely on solvents to dissolve and carry the active ingredient and to aid spreading and penetration. Those solvents are often strong hydrocarbons that can attack elastomeric materials and some plastics used in hoses, gaskets, pumps, and other surfaces. Over time, this exposure can cause swelling, softening, cracking, leaks, or other damage to equipment components, which is a real practical disadvantage that affects maintenance and reliability. Other statements aren’t inherent drawbacks of these formulations: price isn’t fixed and can vary by product, shelf life depends on the specific formulation and storage, and drift characteristics depend on many factors like droplet size and application conditions rather than being a universal drawback of EC/ULV.