What problems result from buying more pesticide than you can use?

Purchasing more pesticide than can be used can lead to a variety of significant issues. One primary concern is the storage and disposal problems that arise from having excess pesticide. Proper storage often requires specific conditions to maintain the integrity of the chemical, and storing large quantities can become cumbersome or difficult to manage. Improper storage may lead to safety hazards or contamination of other materials.

Additionally, pesticides can lose their effectiveness over time, especially if they are improperly stored. Exposure to unfavorable conditions such as high temperatures, moisture, or sunlight can degrade the active ingredients, rendering them ineffective when needed for pest control.

There is also an increased risk associated with handling excess pesticides. More product means more opportunities for accidental spills, exposure, or misuse, which can pose safety risks not only to the applicator but to others in the vicinity as well.

Considering these factors, it becomes clear that buying more pesticide than can be used creates an array of complex challenges encompassing storage, efficacy, and safety, which supports the selection of "All of the above" as a comprehensive answer.