Which of the following defines chemical control?

Chemical control encompasses methods used to manage pest populations through the application of various substances, including pesticides. The correct definition recognizes that chemical control is not limited to just pesticides; it also includes any products that can repel or attract pests, thereby influencing their behavior and reducing their negative impact on crops or turf systems.

Pesticides fall under this umbrella as they are specifically formulated to kill or inhibit pests, but the definition also opens the door to other products and strategies that manipulate pest interactions. This highlights the broader scope of chemical control in pest management, which can include pheromones or other biochemicals that drive pest behavior, complementing the use of traditional pesticides.

Other choices do not accurately capture the full essence of chemical control. The first choice restricts the definition solely to pesticides, which limits understanding. The third option refers to physical barriers, which falls under cultural or physical control methods rather than chemical. The fourth option mentions natural substances for plant growth, which pertain to agronomic practices but do not address pest management directly.