What are the four major pests?
A pest is classed as an animal which could be harmful to humans. They may for example damage crops, livestock or forestry, cause a nuisance by invading homes and work spaces or cause illness by spreading disease. There are four different types of pests – rodents, insects, birds and wildlife. The Four Main Categories of Pests. Pest classification helps professionals determine the most effective strategies for management and elimination. Each category has unique characteristics, life cycles, and methods of causing harm. The main categories are insects, plant diseases, weeds, and vertebrates.