Efficiency and selectivity of RR and LL weed control techniques compared to classical weed control systems.
The herbicides glyphosate and glufosinate-ammonium [glufosinate], as used in the Roundup Ready (RR) and Liberty Link (LL) systems of weed control, provide a broader spectrum of weed control in sugarbeet than current weed control systems. In addition, they will kill weeds at larger growth stages than current techniques and are safer to the crop than current herbicide programmes, especially when weather conditions are extreme. Glyphosate and glufosinate have the ability to kill pernicious weeds, such as Cirsium arvense, Elymus repens, Solanum tuberosum [potato] and other perennials, as well as grass weeds, including Alopecurus myosuroides. The need for 'clean-up' sprays of these herbicides or paraquat + diquat before sugarbeet emergence would be eliminated. Costs of the new systems are likely to be lower than current techniques and are also likely to reduce the cost of weed control throughout the rotation. Glyphosate and glufosinate have better environmental and toxicological profiles than most of the herbicides they replace and, therefore, in theory have few restrictions on their use.