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How can we kill the insects in a crop without any problem?
Crop rotation is a method to kill insects.
Crop rotation involves alternating the species of crop that a farmer grows on his or her land each year. Rotating crops helps prevent pests from getting used to the type of plant that is being cultivated. Planting different species of crops each growing season also promotes soil fertility.  Planting legumes, a plant that helps fertilize crops through nitrogen fixing bacteria that it has on its roots, and then planting crops that require high levels of nitrogen helps make sure that soil is healthy each growing season.
Intercropping: Intercropping is the simultaneous cultivation of two or more crops on the same field. Intercropping works by attracting pests away from their host plant. Planting a variety of plant species on a field increases the distance between plants of the same species, making it harder for pests to target their main crop.


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