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If you are using herbicides on alfalfa, sugarbeets, soybeans, or fieldbeans, information in this Guide will help you apply them at the proper time for best weed control with a minimum of crop injury. Proper timing of postemergence herbicides is essential to achieve maximum weed control with minimum crop injury. As field crops grow and mature, their tolerance to herbicides changes. As a general rule, annual and biennial weeds are more susceptible to postemergence herbicides when they are in the seedling stage, becoming increasingly difficult to control as they mature. The grower is thus faced with the problem of when to apply herbicides to achieve the least crop injury and the most satisfactory weed control. Field crops differ in their growth stages and consequently so does the period when postemergence herbicides can be applied safely. Each crop must be considered separately to identify the correct crop growth stage for the application of each specific herbicide. Herbicides recommended for use in alfalfa, sugarbeets, soybeans, and fieldbeans are discussed in this NebGuide.