What do we call substances used to kill or control pests?

Pesticides are substances specifically designed to kill or control a variety of pests, which can include insects, weeds, fungi, and other organisms that are harmful to crops, livestock, and human health. The term "pesticide" encompasses a wide range of specific chemicals that target different types of pests, making it a broad category that includes herbicides (which specifically target plants) and insecticides (which specifically target insects).

In agriculture and pest management, pesticides play a crucial role in improving crop yields and protecting food supplies by mitigating the damage caused by these pests. This function distinguishes pesticides from fertilizers, which are substances used to enhance plant growth by providing essential nutrients, and insect repellents, which are designed to deter pests rather than kill them. Understanding the role and application of pesticides is essential in discussions about agricultural practices, environmental impacts, and pest control strategies.