Published online by Cambridge University Press: 12 June 2017
In many areas of the southwestern states where cotton is a major crop, the use of 2,4–dichlorophenoxyacetic acid (2,4–D) is hazardous. Its use is restricted by law in many localities during the growing season. In these areas many perennial broad-leaved weeds which are susceptible to 2,4–D, at least to some degree, grow in abundance. Because of extreme arid conditions and other factors these weeds have not responded favorably to soil sterilants. There is urgent need for more effective herbicides for these weeds.