What are the three major groups of pests?

The identification of Insects, Vertebrates, and Wood decay fungi as the three major groups of pests is accurate and reflects a fundamental classification in pest control. Insects are often the most prominent group of pests due to their vast diversity and potential impact on agriculture, health, and structures. They can cause direct damage to crops and products as well as spread diseases.

Vertebrates encompass a range of pest species such as rodents and birds, which can also cause significant structural damage and have health implications for humans. Wood decay fungi represent a crucial category of pests in terms of decay and destruction of wood, which is vital in both natural ecosystems and human constructions.

The other choices do not align with the established categories of pests. Bacteria, fungi, and viruses tend to be related to plant pathology or diseases rather than being primary pest categories. Mammals and reptiles, while they can certainly include pest species, do not represent a major group in the context of pest classification compared to invertebrates like insects. Lastly, the term "Pests, Plants, and Insects" inaccurately includes plants, as they are not considered pests but rather the subjects often affected by pest behavior.