What is the initial step in the flotation method for pest detection?

The flotation method for pest detection begins with cutting the bottom off a coffee can because this creates a device that can effectively separate insects from the soil or plant material. By using the can in this way, you allow for the floating insects to be collected easily during the flotation process.

Once the bottom of the can is removed, it can be placed in a container filled with water and soil sample. As the soil is stirred, lighter organisms, such as pests or insects, will float on the surface of the water and can be collected easily for identification and counting. This initial step is critical, as it sets up the functionality of the flotation method, allowing for proper separation and identification of insects from the substrate.

The other options, while related to the overall process, do not serve as the foundational first step required for utilizing the flotation technique effectively.