Step 1: Understanding pest control methods.
Pest control refers to the strategies used to eliminate or manage harmful organisms such as insects, rodents, or microorganisms that damage crops, spread diseases, or threaten human safety. These methods are generally categorized into chemical, biological, physical, and ecological control methods.
Step 2: Meaning of chemical control.
Chemical control involves the use of chemical substances such as pesticides, insecticides, herbicides, or fungicides to kill or control pests. Insecticides are chemicals specifically designed to kill insects or reduce their populations.
Step 3: Analysis of the options.
- (A) Chemical control: Correct. The use of insecticides directly involves chemicals to eliminate harmful insects.
- (B) Biological control: This method uses living organisms such as predators, parasites, or pathogens to control pests.
- (C) Physical control: Physical control includes mechanical methods such as traps, barriers, or manual removal of pests.
- (D) Ecological control: This method involves altering environmental conditions to reduce pest populations naturally.
Step 4: Conclusion.
Since insecticides are chemical substances used to kill insects, their application to eliminate dangerous insects is classified as chemical control.
Final Answer:} Chemical control.