Which recommended practice will minimize pesticide storage problems?

Storing metal pesticide containers on higher shelves to prevent rusting is a recommended practice that can help minimize pesticide storage problems. When metal containers are stored in damp or humid conditions, they are at a greater risk of rust and corrosion, which can compromise the integrity of the container and lead to leaks or contamination of the pesticide. By placing metal containers on higher shelves, you reduce their exposure to moisture that can accumulate at ground level, thus maintaining the condition of the containers and ensuring safer storage.

Other practices suggested in the options could lead to various issues. Storing pesticides in open containers could expose them to environmental contaminants, leading to decreased efficacy or increased risk of accidental exposure. Mixing old and new pesticides is not advisable, as it can lead to chemical interactions that might alter their effectiveness or safety. Additionally, placing pesticides near heat sources can destabilize them, potentially causing degradation and creating safety hazards such as leaks or fires. Thus, the recommended practice not only addresses the preservation of pesticide integrity but also promotes a safer storage environment.