Which of the following is NOT a primary component of most seed treatments?

The correct answer identifies herbicides as not being a primary component of most seed treatments. Seed treatments are typically focused on protecting seeds and seedlings from pests and diseases that can devastate young plants. Insecticides and fungicides are integral to this purpose; they help prevent damage from insects and pathogens that can attack seeds or young seedlings during germination and establishment.

Water-soluble nutrients can also be included in seed treatments but primarily serve to enhance germination and early plant growth rather than to protect against pests or diseases. Herbicides, on the other hand, are used to control weeds and are generally applied after the seeds have germinated and are growing. Their use at the seed treatment phase is not standard, as they do not target pests or diseases affecting the seed itself, which is the main focus of seed treatment products.