The undesirable plants that grow along with the crops are called weeds. These weeds, feed on the nutrients provided to the crops and thus reduce the supply of nutrients to the crops, thereby, hindering their growth. The growth of these weeds needs to be limited in order to enhance the growth of the plants.
Weedicides are the chemicals which are sprinkled over field to get rid of weeds.
Two popularly used weedicides are 2,4-D Ethyl ester, Neem extract, Glyphosate etc.