Which of the following is not among the SPCS application categories?

The correct choice identifies "Seed Treatment" as not being one of the SPCS application categories. The SPCS, or Structural Pest Control Services, focuses primarily on applications related to structural pests, which include termites and wood-destroying organisms.

Termite and wood treatments are essential aspects of pest management, targeting specific insects and their effects on structures. Commodity fumigation preservation is relevant as it pertains to protecting stored goods from pests, linking it directly to the pest control industry.

In contrast, seed treatment is typically associated with agricultural practices aimed at protecting seeds from pests and diseases before planting. This category does not fall under the traditional structural pest control applications, as it is more related to crop protection rather than direct pest management in structures. Thus, identifying "Seed Treatment" highlights a clear distinction between agricultural and structural pest control categories.