What is a disadvantage of both EC and ULV pesticide formulations?

The correct answer highlights a significant concern with both EC (Emulsifiable Concentrate) and ULV (Ultra Low Volume) pesticide formulations, which is the degradation of rubber or plastic components. These formulations often contain solvents and other chemicals that can be corrosive or damaging to certain materials. This degradation can result in equipment failure or leaks, posing additional safety risks and potentially increasing costs for repairs or replacements. Understanding this disadvantage is crucial for those involved in pesticide application, ensuring they select appropriate materials for their equipment and minimize any potential harm to components that may come into contact with these formulations.

Other factors like high application costs, difficulties in application, and concerns about effectiveness might be relevant in different contexts but do not specifically pertain to the unique chemical properties and physical characteristics that both EC and ULV formulations share in relation to material degradation.