Describe the various methods of controlling pests attacking stored grains.

Field crops are infested with a variety of pests. There are various methods by which insects and diseases can be controlled. One of the most common and effective methods is the use of pesticides or biocides that include insecticides (for killing the insects), weedicides (for killing the weeds) and fungicides (for killing the fungi). Thus chemicals used to kill the pests, e.g. weeds; insects, mites, rodents and fungi are called pesticides. These chemicals are sprayed on crop plants or used for treating seeds and soil. Once the pesticides are used the pests are killed on the spot without damaging the crop plant.