The compound used to fight weeds and pests is commonly referred to as a herbicide or pesticide, respectively. Herbicides are designed to target unwanted plants, while pesticides are used to control insects and other pests that can damage crops. These chemical products can be selective, acting on specific types of weeds or pests, or non-selective, affecting all plant life in the area. It's important to apply these substances carefully to minimize environmental impact and develop integrated pest management strategies that combine chemical, biological, and cultural practices for sustainable agriculture.