Which of the following is NOT a factor to consider in pre-application planning for aerial spraying?

In the context of pre-application planning for aerial spraying, the correct answer focuses on factors that are directly related to the immediate logistics and effectiveness of the spraying operation. Wind direction, crop maturity, and weather forecast are crucial because they directly influence how and when the spraying should be conducted.

Wind direction is vital as it affects the drift of the spray and can determine if the application is safe and effective. Crop maturity is important to ensure that the application of any chemicals will yield the desired results at the right growth stage. The weather forecast influences not only the timing of the application but also the safety and efficacy of the materials being applied, as conditions like rain or temperature can alter how and when the application should be done.

In contrast, market prices of crops, while significant for economic decisions and farming strategy, do not directly impact the technical aspects of the aerial application itself. This factor involves a broader economic context rather than the operational considerations that must be addressed to ensure a successful application. Thus, it is not a primary concern during the planning phase for the actual process of aerial spraying.