Which measure is essential to ensure safe pesticide application?

The importance of maintaining an anti-siphon device is rooted in preventing contamination of water sources during pesticide application. An anti-siphon device is designed to stop the backflow of liquids into the water supply, which can happen if there is a sudden drop in pressure in the system. This is crucial because pesticides can have harmful effects on aquatic life and human health if they inadvertently enter water sources.

Using an anti-siphon device ensures that even in the event of a malfunction or pressure fluctuation, the pesticide will not siphon back into the water supply system, thus protecting the environment and public health. Proper installation and regular maintenance of these devices is a key safety measure in the application process as it effectively mitigates the risk of environmental contamination that could arise from improper pesticide handling or application practices.