What type of pest is classified as a secondary pest?

The classification of a secondary pest is based on its feeding behavior and the conditions it thrives in. A secondary pest typically infests materials that are already damaged or compromised, such as old or moldy grains. This pest plays a role in the decomposition process and often flourishes in environments that have been previously affected by primary pests or spoilage. Therefore, the chosen answer identifies a pest that capitalizes on the weakened state of food products, which aligns perfectly with the behavior of a secondary pest.

In contrast, primary pests usually target healthy products directly, and options that refer to pests not causing harm to grains or feeding internally on stored products do not fit the definition of secondary pests as they do not emphasize the concept of infesting already damaged goods.