All over the world, one of the main purposes of extension is to increase the level of living standards of the rural family through non-formal education. Extension has a very crucial role to play in sustainable development and organic agriculture. For that reason, extension activity is implemented by different institutions. Extension systems worldwide are operated by governmental (86%) and non-governmental (14%) organizations. In this paper, allelopathy is accepted as a technology to implement for weed control and biological control of other useful traits.