There is provided a method of loading a container with a defined quantity of product comprising closing off a perforation in a perforated plate; directing powder into the closed-off perforation by the sweeping action of a first director blade spaced from said perforated plate; and transferring the contents of the perforation to said container. A combination of seeds for controlling insect pests is also disclosed. The external enclosure also includes a top vent opening. An intuitive, top-down mounting mechanism locks the electronic device in place without user input. And it carries out all of these legitimate interests in a way that is fast, simple to use and easy to audit.