Agriculture pests include insects, nematodes, disease-causing organisms, mites weeds, and vertebrates. By monitoring their populations and life stages, growers can act to control pests at the most effective times, before they can substantially damage crops. During World War II, the development of pest control with the combination of other chemicals increased rapidly for pest control in Agriculture. People began to see the cons of this development of pesticides, the pests that were naturally controlled it started to cause bigger damage and the pests started to become resistant to the chemicals. The Agricultural workers were also starting to become sick from being exposed to the pesticides. In 1950, the researchers of the University of California warned the dangers of using the pesticides on pest control, they also helped with the philosophy of “integrated control” or “integrated pest management”. According to the author Frank G. Zalom, “IPM is an ecologically based pest control strategy that considers all available management options, including inaction. IPM combines cultural, chemical and biological controls with ecology and systems science”. The former UC vice president of Agricultural and Natural Resources James B. Kendrick decided to; to reduce the pesticide load in the environment, to increase the utilization of natural pest controls, and also publish manuals to help the users know what they are using. Integrated pest management have a lot of pros and cons since it started to develop. The development of pesticides benefited many growers but they did not knew much about them so it caused problems on the other hand. Many researches were made on pesticides to be able to be effective the users should know how to use them. However, continuously use the same pesticide will make the pest become resistant to the pesticide.    Zalom F, Flint M. 1990. Integrated pest management in California. Calif Agr 44(5):4-6.