Why is weighing, measuring, mixing, and filling considered more hazardous for the applicator when spraying?

Weighing, measuring, mixing, and filling pesticides is considered more hazardous for the applicator primarily because during these processes, the applicator may come into contact with more concentrated pesticide formulations. Concentrated pesticides contain a higher percentage of active ingredients, making them more toxic and increasing the risk of exposure. This direct handling heightens the potential for skin absorption, inhalation of fumes or dust, and accidental spills.

In contrast, when spraying the pesticide, while there is still risk involved, the applicator is often using diluted formulations that have already been mixed, reducing the concentration of active ingredients compared to the original concentrated form. Therefore, the risk associated with direct handling of these concentrated materials during preparation is significantly greater, justifying the concern for increased hazards during that stage of pesticide application.