Which of the following is NOT one of the main types of pesticides?

Fertilizers are not classified as a type of pesticide. Instead, fertilizers are substances that provide essential nutrients to plants, promoting their growth and health. They enhance the soil's nutrient content but do not serve the primary function of controlling pests, diseases, or weeds, which is the purpose of pesticides.

Insecticides, herbicides, and fungicides are all types of pesticides that target specific organisms. Insecticides are designed to kill or deter insects, herbicides target unwanted plants (weeds), and fungicides are used to control fungal infections. Each of these categories serves an important role in pest management and agricultural practices, while fertilizers support plant growth rather than pest control. Understanding the distinctions between these types of products is crucial for effective agricultural management and responsible pesticide use.