Scouting for alfalfa weevil larvae can be simplified by first using a sweep net to determine if are in the field. Sweeping even a small patch of alfalfa with a net can reveal whether or not larvae are present. If they are found in the net, then proceed to the stem-sampling technique. This technique more accurately determines the population size and the potential for economic damage.
Iowa State University
Rice, Marlin E., "Alfalfa weevil: Scouting and economic thresholds" (2005). Integrated Crop Management News. 1377.
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