When should a used nozzle be replaced based on its flow rate variation?

The guideline for replacing a nozzle primarily revolves around maintaining effective and efficient pesticide application. A variation in the flow rate of 5% or more indicates that the nozzle may not be delivering the correct amount of pesticide, which can lead to both under-application, risking ineffective pest control, and over-application, resulting in potential harm to the environment and non-target organisms.

Nozzles that maintain consistent flow rates are crucial for accurate application rates, ensuring compliance with label directions and safety regulations. By replacing nozzles showing this level of variation, applicators can help ensure uniformity in application across different areas, which is vital for efficacy and safety. This standard helps practitioners avoid negative outcomes associated with inconsistent pesticide delivery.