The effective control of pests such as weeds, insects, and diseases is critical to assuring healthy crops and enhancing agricultural productivity. Various pest control methods have been adopted. One is the use of chemical pesticides, which is still the most common method because it is cheap and often very effective. The effectiveness of chemical pesticides in protecting crops, however, has masked the negative impacts associated with their use. For farmers, the most serious are the acquisition of pest resistance to the chemicals, secondary pest outbreaks, and health hazards associated with the application of chemicals. For consumers, the main problems are pesticide residues in food
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