Which of the following is NOT a category of pesticide?

Fertilizers are not classified as pesticides; they are substances that are applied to soil or plants to provide essential nutrients and promote plant growth. In contrast, herbicides, insecticides, and fungicides are all types of pesticides specifically designed to manage pests that can harm plants. Herbicides target unwanted plants (weeds), insecticides are used to control insect populations, and fungicides are aimed at preventing or treating fungal infections. Understanding the distinction between these categories is essential for effectively managing agricultural practices and ensuring the appropriate application of chemical products in farming and gardening contexts.