Which of the following colors is NOT associated with any spray nozzle types?

The color purple is not associated with any spray nozzle types in the context of aerial application. Spray nozzles are often color-coded to indicate their specific flow rates and patterns, which helps applicators quickly identify the right nozzle for their spraying needs.

For instance, the other colors like green, white, and orange correspond to different sizes and types of nozzles, thus making them relevant in the industry. Green typically represents medium-sized nozzles, while white and orange indicate different flow rates that would also influence droplet size and distribution patterns. The absence of a purple designation in this context means it does not align with the established color coding system for nozzles used in agricultural spraying practices. Understanding these color codes is essential for applicators to ensure they select the appropriate equipment for effective and safe aerial application.