Which characteristic of a granular pesticide does NOT affect its flow rate?

The characteristic of a granular pesticide that does not affect its flow rate is color. When considering how granular pesticides behave during application, flow rate is primarily influenced by physical attributes such as size, weight, and shape.

Size is crucial because larger granules may tend to flow more sluggishly compared to smaller ones, which can slip through equipment more easily. Weight plays a significant role as well; heavier granules may settle or compact more tightly, impeding flow. Similarly, the shape of the granules can impact how they interact with one another during movement—irregular shapes might cause blockages or slow down flow, whereas more uniform shapes can enhance smooth movement through equipment.

Color, on the other hand, does not have an influence on how the granules flow. It is primarily a visual characteristic and does not impact the physical behavior of the granules during application or handling. Therefore, among the listed characteristics, color is the only one that does not play a role in affecting the flow rate of granular pesticides.