There are several disadvantages of using the chemical herbicides, such as the environmental hazards and the development of resistance against many herbicides, like atrazine 2, 4-D, metribuzin, paraquat (Gramoxone), trifluralin,
diphenamid, and glyphosate [29-31].
Examples of organic herbicides include phenoxy (2,4-D), dipehenyl ethers (Fusilade[R]), organic arsenicals (arsenic and derivatives of arsenic), substituted amide (
Diphenamid), substituted ureas (Siduron), carbamates (EPTC), triazines (Simazine[R]), aliphatic acids (Dalapon), and bipyridyliums (paraquat).