Which reference is considered best for directions on using a particular pesticide?

The best reference for directions on using a particular pesticide is the manufacturer's website. This source provides the most accurate, up-to-date, and comprehensive information directly from the producer of the pesticide. Manufacturer websites typically include detailed usage instructions, safety precautions, application rates, and other crucial guidelines that ensure the pesticide is used effectively and safely.

While personal notes, records of past use, and peer-reviewed articles can provide useful insights or context, they may not be as reliable for specific application instructions as the manufacturer's directives. Personal notes may lack thoroughness or relevance to current standards, past records may not reflect changes in formulation or regulations, and peer-reviewed articles might provide broader research but not specific application guidelines tailored to a particular product. Thus, consulting the manufacturer's website is essential for correct and safe pesticide application.