Which of the following is NOT a major group of pests?

Bacteria is not typically classified as one of the major groups of pests. In pest management, major groups usually encompass organisms that cause significant physical harm to crops, structures, or human health. The major groups commonly identified include insects, which can infest various environments and structures; weeds, which compete with desired plants for resources; and pathogens, such as fungi and viruses, which can lead to disease in plants and animals.

While bacteria can indeed be involved in plant diseases, they are generally categorized under pathogens rather than being recognized as a separate major group of pests. Thus, the identification of bacteria as a non-major pest group aligns with standard classifications used in pest control and management.